PCR-RFLP for Distinguishing Periplocae Cortex from Acanthopanacis Cortex and Lycii Cortex / 中国实验方剂学杂志

ObjectiveTo establish a polymerase chain reaction-restriction fragment length polymorphism （PCR-RFLP） method for rapid distinguishing Periplocae Cortex from Acanthopanacis Cortex and Lycii Cortex， so as to avoid the influence of genetic confusion on drug safety. MethodThe DSS-tagged sequences of Periplocae Cortex were obtained from the Chloroplast Genome Information Resource （CGIR） and analyzed to find the enzymatic cleavage sites that were different from those of Acanthopanacis Cortex and Lycii Cortex. The specific enzymatic cleavage site， Cla I， of Periplocae Cortex was selected， on the basis of which the primers for PCR-RFLP were designed. Furthermore， the factors such as annealing temperature， number of cycles， Taq enzyme， PCR instruments， and enzymatic treatment time that may influence PCR-RFLP were studied. The established PCR-RFLP method was applied to the identification of Periplocae Cortex， Acanthopanacis Cortex， and Lycii Cortex samples produced in different regions. ResultThe PCR-RFLP at the annealing temperature of 59 ℃ and with 40 cycles showed clear bands of the samples. When the enzyme digestion time was 30 min. The reaction produced the target bands at about 140 bp and 290 bp for both Periplocae Cortex and its original plant and only a band at about 430 bp for Acanthopanacis Cortex， Lycii Cortex， and their original plants. The method can accurately distinguish Periplocae Cortex from its confounders Acanthopanacis Cortex and Lycii Cortex. ConclusionThe PCR-RFLP method for distinguishing Periplocae Cortex from Acanthopanacis Cortex and Lycii Cortex was established. It has high stability， sensitivity， and applicability， providing a reference for the quality control of Periplocae Cortex， Acanthopanacis Cortex， and Lycii Cortex.

A Rapid PCR-RFLP Method for Assessing Heterozygosity of Murraya paniculata Germplasm / 中国实验方剂学杂志

ObjectiveTo establish a rapid method for evaluating the heterozygosity of Murraya paniculata germplasm materials and provide as a foundation for developing germplasm breeding and innovation measures for M. paniculata. MethodSingle nucleotide polymorphisms （SNPs） were screened from the genome resequencing data of 65 plants of M. paniculata. A self-written script was used to transform 20 SNPs into restriction fragment length polymorphism （RFLP） markers. Polymerase chain reaction-restriction fragment length polymorphism （PCR-RFLP） was employed to detect the 20 RFLP markers in 12 M. paniculata germplasm accessions， and the heterozygosity of M. paniculata germplasm accessions was calculated based on the number of enzyme-cutting bands at the 20 RFLP marker sites. Plink was used to calculate the whole genome heterozygosity of 12 M. paniculata germplasm accessions， and the results obtained with different methods were compared. ResultThere was no significant difference in the heterozygosity calculated by the PCR-RFLP method and the genome resequencing method. The PCR-RFLP and genome resequencing methods identified 8 and 9 germplasm accessions， respectively， with a heterozygosity level less than 30%. Seven germplasm accessions with heterozygosity less than 30.00% were calculated by both methods. ConclusionThe PCR-RFLP method established in this study for evaluating the heterozygosity of M. paniculata germplasm demonstrates the precision of 87.5% and the accuracy of 77.8%. This method serves as a reference for developing heterozygosity evaluation methods in other medicinal plant germplasm resources.

Polimorfismo de proteína 5, 10-metilentetrahidrofolatoreductasa en población venezolana / Polymorphisms proteína 5, 10-metilentetrahidrofolatoreductasa in venezuelan people

El folato es un miembro del grupo de la vitamina B y está relacionado con enfermedades crónicas como anemia megaloblástica, enfermedad cardiovascular, cáncer, disfunción cognitiva y riesgo de defectos del tubo neural. La proteína 5,10-metilentetrahidrofolato reductasa (MTHFR) juega un papel clave en el metabolismo del folato mediante la síntesis de nucleótidos y reacciones de metilación. El gen MTHFR se encuentra en el cromosoma 1 (1p36.3), y se han descrito dos alelos comunes, el alelo C677T (termolábil) y el alelo A1298C.El objetivo de este estudio es evaluar la distribución de los polimorfismos genéticos en MTHFR C677T y A1298C en la población venezolana. METODOS: estudio de tipo transversal, descriptivo, experimental y correlacional Las muestras de sangre se colectaron en 314 donantes no emparentados y sanos de la población. Los polimorfismos de un solo nucleótido(SNP) MTHFR 677C>T y 1298A>C se analizaron mediante polimorfismo de longitud de fragmento de restricción de reacción en cadena de polimerasa (PCR-RFLP). El desequilibrio de ligamiento (LD) entre pares de SNP se calculó mediante la prueba X. usando Prism 5 (GraphPad software, Inc). RESULTADOS: Encontramos mayor frecuencia genotípica de heterocigotos para el polimorfismo MTHFR C677T en la población general venezolana, con excepción del grupo caucásico. El polimorfismo MTHFR A1298C en el 70%de la población de estudio es homocigoto de tipo salvaje, encontrándose una baja frecuencia de homocigoto mutado. CONCLUSIONES: Se encontraron diferencias significativas entre grupos étnicos, destacando la importancia del genotipado racial de estos polimorfismos en la población venezolana(AU)

Folate is a member of the vitamin B and it has also been indicated that may be related to chronic diseases such as megaloblastic anemia, cardiovascular disease, cognitive dysfunction and risk of neural tube. Methylenetetrahydro folatereductase (MTHFR) is a key enzyme of folate pathway by nucleotide synthesis and methylation reactions. Several polymorphisms were reported in MTHFR gene but C677Tand A1298 polymorphism are most studied and these have been reported to be risk factor for several diseases/disorders. The present study was designed to determine the frequency of MTHFR polymorphisms in Venezuelan healthy population. METHODS: The blood samples were collected from 314 unrelated and healthy donors from population. Both the MTHFR 677C>T and 1298A>C single nucleotide polymorphisms (SNPs) were analyzed by Polymerase chainreaction-restriction fragment length polymorphism (PCR-RFLP). Linkage disequilibrium (LD) between pair of SNPs was calculated through the .. test using Prism 5 (GraphPad sftoware, Inc). RESULTS: We find higher genotypic frequency of heterozygotes for the MTHFR C677T polymorphism in the Venezuelan general population, with the exception of the Caucasian group. MTHFR A1298C polymorphism in 70%of the study population is homozygous wild type, finding alow frequency of homozygous mutated. CONCLUSIONS: Significant differences between ethnic groups were found,highlighting the importance of racial genotyping of these polymorphisms in the Venezuelan population(AU)

Associative role of methylenetetrahydrofolate reductase and thymidylate synthase 6bp del gene polymorphism in preterm delivery

Objective: Preterm delivery is a major adverse birth outcome, approximately 15 million babies are born prematurely every year. There are several causes for preterm deliveries. This study focuses on folate metabolic pathways. Dietary folate plays a crucial role in premature labor. We examined the relationship between methylenetetrahydrofolate reductase (MTHFR) (C677T) and thymidylate synthase (TYMS) 6bpdel polymorphism. Materials and Methods: A total number of 300 pregnant women were selected for this study; among which ( n = 150) were preterm and ( n = 150) were term delivery cases. The selected samples were further processed for molecular polymerase chain reaction-restriction fragment length polymorphism analysis. The demographic profile of birth status resulted significantly with ( P = 0.0001) proving chances of high infant mortality due to prematurity. Results: The genotype distribution of MTHFR C677T showed significant data ( P = 0.0021) whereas insignificant genotypic distribution was observed for the TYMS gene ( P = 0.067). Our results imply that genes that are involved in the folate pathway play a crucial role in early pregnancy. Conclusion: Advanced and better strategies can be brought to an improved intervention of folate at the time of pregnancy which will help to reduce the rate of premature deliveries.

Identification of Arisaematis Rhizoma and Pinelliae Rhizoma by PCR-RFLP / 中国实验方剂学杂志

ObjectiveIn recent years， with the sharp decline of wild resources in Arisaematis Rhizoma and Pinelliae Rhizoma and the immaturity of medicinal cultivation technology， their adulterants have appeared frequently in the market， and the main identifying characteristics have mostly disappeared in the circulation of medicinal materials. Therefore， there is an urgent need to establish a molecular identification method that can quickly and effectively identify the specificity of Arisaematis Rhizoma and Pinelliae Rhizoma. MethodAfter comparison of the rbcL sequences of Arisaematis Rhizoma，Pinelliae Rhizoma， and their adulterants， the specific enzyme cleavage sites Hae Ⅲ and Dra Ⅰ of Arisaematis Rhizoma and Pinelliae Rhizoma， respectively， were selected and identified by polymerase chain reaction-restriction fragment length polymorphism（PCR-RFLP）. The main system conditions of PCR-RFLP reaction were established and optimized， and their durability and the ability to detect genuine， adulterants， and mixed counterfeits were investigated. ResultThe PCR-RFLP identification method of Arisaematis Rhizoma and Pinelliae Rhizoma was established. After specific primer amplification， Arisaematis Rhizoma and Pinelliae Rhizoma could be digested by Hae Ⅲ and Dra Ⅰ-restricted endonucleases respectively， at annealing temperature of 54 ℃， the number of cycles of 35， and the amount of DNA template of 3-30 ng， producing two fragments or small cut fragments with a single band between 100-250 bp， whereas the mixed counterfeits were not cleaved and both showed a band at 250 bp. The method is highly accurate in identifying adulterants and mixed counterfeits of Arisaematis Rhizoma or Pinelliae Rhizoma. ConclusionThe PCR-RFLP method developed in this study allows for the rapid identification of Arisaematis Rhizoma and Pinelliae Rhizoma.

Standardization of molecular techniques for the detection and characterization of intestinal protozoa and other pathogens in humans

Background: The intrinsic sensitivity limitations of basic parasitological methods, along with the particular biological characteristics of parasites, make these methods ineffective to differentiate morphologically indistinguishable species. Molecular detection and characterization techniques could be used to overcome these problems. The purpose of this work was to standardize molecular polymerase chain reaction (PCR) techniques, described in the literature, for the detection and molecular characterization of intestinal protozoa and other pathogens in humans. Methods: DNA was extracted from human or animal feces, previously washed or cultured in Boeck Drbohlav's Modified Medium. DNA extraction was performed with Machery-Nagel extraction kits. The standardization of the PCR, nested-PCR or RFLP techniques was carried out according to the literature. For each molecular technique performed, the sensitivity of the test was determined based on the minimun quantity required of DNA (sensitivity A) and the minimum quantity of life forms that the test detected (sensitivity B). Results: Sensitivity A was 10 fg for G. duodenalis, 12.5 pg for Entamoeba histolytica or Entamoeba dispar, 50 fg for Cryptosporidium spp., 225 pg for Cyclospora spp. and 800 fg or 8 fg for Blastocystis spp. after performing a 1780 bp PCR or 310 bp nested PCR, respectively. The sensitivity B was 100 cysts for G. duodenalis, 500 cysts for E. histolytica or E. dispar, 1000 oocysts for Cyclospora spp. and 3600 or four vegetatives forms for PCR or nested PCR of Blastocystis spp., respectively. Conclusions: The molecular detection of protozoa and chromist was achieved and the molecular characterization allowed the genotyping of some of the parasites such as Giardia duodenalis, Cryptosporidium spp., and Blastocystis spp. This study summarizes the molecular techniques for epidemiological studies in humans and animals, and helps in the investigation of their transmission sources in countries where intestinal parasites are a public health problem.(AU)

Effect of Leptin, Pituitary Transcription Factor and Luteinizing Hormone Receptor Genes Polymorphisms on Reproductive Traits and Milk Yield in Holstein Cattle

Abstract The aim of this study was to estimate allelic and genotypic frequencies of markers in the leptin (LEP), pituitary transcription factor (PIT-1) and luteinizing hormone receptor (LHR) genes and evaluate their effects on reproductive traits and milk yield of Holstein cattle. Data from 147 cows from department of Francisco Morazán, Honduras, were collected and PCR-Restriction Fragment Length Polymorphism (RFLP) assays were performed to characterize the PIT-1-HinfI, LEP- A59V and LHR-rs41256848 polymorphisms. To estimate the effect of genotypes on reproductive traits and milk yield fixed and mixed linear models were fitted. The frequencies of the genotypes CC, CT and TT of A59V, AA, AB and BB of HinfI, and CC, CG and GG of rs41256848 were 0.46, 0.33 and, 0.21; 0.09, 0.32 and 0.58; and 0.37, 0.61 and 0.02, respectively. The genotypes of LEP and LHR showed deviations from Hardy-Weinberg equilibrium. The A59V polymorphism was significantly associated with the calving to conception interval (CCI) (p=0.01), being the C allele favorable. The HinfI and rs41256848 polymorphism were significantly associated (p=0.08 and p=0.04) with age to first calving (AFC), being the A and G the alleles favorable associated, respectively. The results suggest that LEP, PIT and LHR polymorphisms can probably act as candidate to be used in marker-assisted selection for AFC and CCI traits.

Molecular characterization of Toxoplasma gondii isolates from free-range chickens reveals new genotypes in Goiânia, Goiás, Brazil / Caracterização molecular de Toxoplasma gondii isolados de galinhas caipiras revela novos genótipos em Goiânia, Goiás, Brasil

Abstract The aim of this study was to evaluate the genotypic characteristics of Toxoplasma gondii isolated from free-range chickens in the metropolitan area of Goiânia, Goiás, in Brazil's central-west region. The seroprevalence rate was found to be 96%, according to an indirect hemagglutination assay. Brain and heart samples were processed by peptic digestion for a mice bioassay. The tissues were homogenized and the resulting samples were subjected to polymerase chain reaction (PCR), which revealed that 64% of them contained the parasite's DNA. The mice bioassay revealed 15 isolates, 8 of them tachyzoites isolates from the peritoneal lavage and 7 from brain cysts. T. gondii genotypes were determined through PCR-RFLP, using the following markers: SAG1, SAG2, SAG3, BTUB, GRA6, c22-8, c29-2, L358, PK1, alt. SAG2, Apico and CS3. Three genotypes were identified, inclued ToxoDB #65, and the other two are not yet described in the literature. Hence, we conclude that the isolates obtained from the metropolitan area of Goiânia showed relatively low genetic diversity.

Resumo O objetivo deste estudo foi avaliar as características genotípicas de Toxoplasma gondii isolados de galinhas caipiras da Região Metropolitana de Goiânia, Goiás, Região Centro Oeste do Brasil. A soroprevalência foi de 96% dos animais, determinada por hemaglutinação indireta. As amostras de cérebro e coração foram processadas através da digestão péptica para o bioensaio em camundongos. Os tecidos foram homogeneizados, e as amostras resultantes foram analisadas por reação em cadeia da polimerase (PCR), que possibilitou a detecção do DNA do parasito em 64% deles. Por meio do bioensaio em camundongos, foi possível detectar 15 isolados, 8 deles apresentando taquizoítos na lavagem peritoneal e 7 apresentando cistos cerebrais. A determinação dos genótipos de T. gondii foi realizada por PCR-RFLP com os seguintes marcadores: SAG1, SAG2, SAG3, BTUB, GRA6, c22-8, c29-2, L358, PK1, alt. SAG2, Apico e CS3. Foi possível definir 3 genótipos, incluindo o ToxoDB # 65 e dois deles ainda não foram descritos na literatura. Portanto, conclui-se que os isolados obtidos na região metropolitana de Goiânia apresentaram diversidade genética relativamente baixa.

Identification of Levisticum officinale Adulterated in Angelica sinensis by PCR-RFLP / 中国实验方剂学杂志

Objective:To establish a rapid method to identify <italic>Levisticum officinale </italic>adulterated in<italic> Angelica sinensis</italic> by polymerase chain reaction -restriction fragment length polymophism（PCR-RFLP）. Method:By comparing sequences restriction sites in ribosomal DNA Internal Transcribed Spacer（ITS） of <italic>A. sinensis</italic> and <italic>L. officinale</italic>，the specific restriction site Fnu4HI of <italic>L. officinale</italic> was selected，and the primers for PCR-RFLP reaction were designed. Different <italic>A. sinensis</italic> and <italic>L. officinale</italic> were amplified by PCR. The conditions affecting the PCR-RFLP reaction，such as annealing temperature，primer concentration，cycle number and enzyme digestion reaction time，were optimized，and the accuracy of the method was investigated. The established PCR-RFLP identification method was used to investigate the applicability of <italic>L. officinale </italic>adulterated<italic> in A. sinensis</italic> with different aduleration ratios and different origins. Result:A PCR-RFLP method for identifying <italic>A. sinensis</italic> mixed with <italic>L. officinale</italic> was established. When the annealing temperature was 62 ℃ and the number of cycles was 30，when the <italic>L. officinale </italic>adulterated in<italic> A. sinensis</italic> could be digested by Fnu4H I restriction endonuclease after amplification with specific primers，and the two single DNA bands were detected between 100-500 bp，the <italic>A. sinensis</italic> were all negative. The minimum detection limit of this method for adulterated <italic>L. officinale</italic> in <italic>A. sinensis</italic> was 3%，which could be used for the detection of adulterated <italic>L. officinale</italic> in <italic>A. sinensis</italic>. Conclusion:The established PCR-RFLP identification method is sensitive and accurate in detecting whether there is <italic>L. officinale</italic> in <italic>A. sinensis</italic>，and it provides inspection reference and basis for the quality control of <italic>A. sinensis</italic>，with great significance to ensure the safety of its clinical medication.

TNF-α-308 G/A variant may be associated with bipolar disorder in a Turkish population

ABSTRACT Background: Tumor necrosis factor alpha (TNF-α) is a proinflammatory multifunctional cytokine produced by macrophages. A dysregulation of the immune system contribute to the pathogenesis of bipolar disorder (BD). In this study, we aimed to investigate the relationship between the TNF-α gene -308G/A promoter variant and the risk of BD. Methods: A total of 104 BD patients and 94 healthy controls were enrolled in the study. Genomic DNA was isolated and TNF-α -308G/A variant was analyzed using PCR-RFLP method. Results: TNF-α -308G/A variant GG genotype and G allele were more prevalent in BD patients compared to the controls (p = 0.002 and p = 0.017, respectively). The patients carrying GG genotype had a 5.927-fold higher risk of developing BD. Then, we divided patients into two groups as smokers and non-smokers. TNF-α -308G/A variant GA genotype was higher in non-smoker BD patients than smoker patients (p = 0.027). We found that TNF-α -308G/A AA genotype and A allele increased in smoker patients compared to non-smoker patients (p = 0.008, p = 0.002, respectively). Discussion: Our results provided evidence that TNF-α -308G/A variant may contribute to development of BD in a Turkish cohort. In addition, this variant plays a relevant role in the smoker status of BD.

Detección de mutaciones del gen 23S de Helicobacter pylori implicadas en la resistencia a claritromicina / Detection of Helicobacter pylori 23S gene involved in clarithromycin resistance / Detecção de mutações no gene 23S do Helicobacter pylori envolvidas na resistência à claritromicina

INTRODUCCIÓN: uno de los principales factores que influyen en el tratamiento para la erradicación de Helicobacter pylori es la resistencia a antibióticos, la cual difiere entre países e incluso regiones de un país. Entre los antibióticos más usados para el tratamiento de la infección se encuentra la claritromicina, se ha demostrado que el gen 23S ARNr está involucrado en la resistencia a este antibiótico, como resultado de mutaciones puntuales. OBJETIVO: detectar las mutaciones presentes en el gen 23S ARNr que codifican la resistencia a la claritromicina en Helicobacter pylori a través de un método no invasivo y rápido. MATERIALES Y MÉTODOS: a partir de muestras de heces de 76 pacientes con síntomas gastrointestinales asociados a la bacteria, se aisló y purificó el ADN bacteriano, se identificó el gen 23S ARNr mediante seminested PCR. Para la detección de mutaciones puntuales en el gen se realizó la RFLP, utilizando las enzimas HhaI que detecta la mutación T2717C y MboII que identifica la mutación A2142C/G. RESULTADOS: un total de 45 pacientes resultaron positivos a Helicobacter pylori lo cual corresponde al 59,2%. La mutación T2717C analizada con la enzima HhaI se presentó en el 2,2% de la muestra de estudio, no se obtuvo resultados positivos para la enzima MboII. CONCLUSIONES: a través de la Seminested PCR se identificó al gen 23S ARNr de Helicobacter pylori, PCR-RFLP es un método fiable para detectar la presencia de mutaciones causantes de resistencias a antibióticos, útil antes de elegir el tratamiento erradicador contra las infecciones por Helicobacter pylori.

INTRODUCTION: one of the main factors that influence the treatment for the eradication of Helicobacter pylori is resistance to antibiotics, which differs between countries and even regions of a country. Clarithromycin is among the most widely used antibiotics for the treatment of infection. The 23S rRNA gene has been shown to be involved in resistance to this antibiotic, as a result of point mutations. OBJECTIVE: to detect the mutations present in the 23S rRNA gene that encode resistance to clarithromycin in Helicobacter pylori through a non-invasive and rapid method. MATERIALS AND METHODS: from stool samples of 76 patients with gastrointestinal symptoms associated with the bacteria, bacterial DNA was isolated and purified, the 23S rRNA gene was identified by seminested PCR. For the detection of point mutations in the gene, RFLP was performed, using the enzymes HhaI that detects the T2717C mutation and MboII that identifies the A2142C / G mutation. RESULTS: a total of 45 patients were positive for Helicobacter pylori, which corresponds to 59.2%. The T2717C mutation analyzed with the HhaI enzyme was present in 2.2% of the study sample, no positive results were obtained for the MboII enzyme. CONCLUSIONS: the 23S rRNA gene of Helicobacter pylori was identified through Seminested PCR, PCR-RFLP is a reliable method to detect the presence of mutations causing resistance to antibiotics, useful before choosing the eradication treatment against Helicobacter pylori infections.

INTRODUÇÃO: um dos principais fatores que influenciam no tratamento para erradicação do Helicobacter pylori é a resistência aos antibióticos, que difere entre países e até mesmo regiões de um país. A claritromicina está entre os antibióticos mais amplamente utilizados para o tratamento de infecções.O gene 23S rRNA demonstrou estar envolvido na resistência a esse antibiótico, como resultado de mutações pontuais. OBJETIVO: detectar as mutações presentes no gene 23S rRNA que codificam resistência à claritromicina no Helicobacter pylori, por meio de um método não invasivo e rápido. MATERIAIS E MÉTODOS: a partir de amostras de fezes de 76 pacientes com sintomas gastrointestinais associados à bactéria, o DNA bacteriano foi isolado e purificado, o gene 23S rRNA foi identificado por PCR seminestado. Para a detecção de mutações pontuais no gene, foi realizado RFLP, utilizando as enzimas HhaI que detecta a mutação T2717C e MboII que identifica a mutação A2142C / G. RESULTADOS: um total de 45 pacientes foram positivos para Helicobacter pylori, o que corresponde a 59,2%. A mutação T2717C analisada com a enzima HhaI estava presente em 2,2% da amostra do estudo, nenhum resultado positivo foi obtido para a enzima MboII. CONCLUSÕES: por meio da PCR seminestada, foi identificado o gene rRNA 23S do Helicobacter pylori, o PCR-RFLP é um método confiável para detectar a presença de mutações que causam resistência a antibióticos, útil antes de escolher o tratamento de erradicação contra infecções por Helicobacter pylori.

Toxoplasma gondii genotyping from free-range chickens (Gallus gallus domesticus) in a rural area of Rio Grande do Sul, Brazil / [Genotipagem de Toxoplasma gondii em galinhas domésticas em uma área rural do Rio Grande do Sul, Brasil]

Free-range chickens may ingest oocysts of T. gondii present in the environment and consequently harbor virulent strains of this parasite in different tissues, without any clinical signs. Isolation of T. gondii through bioassays on mice and cats from naturally infected chicken tissues has been described in several countries, demonstrating the importance of free-range chickens in the transmission of this parasite. The aim of this study was the genotypic characterization of T. gondii isolates obtained from naturally infected free-range chickens in a rural area of the state of Rio Grande do Sul, Brazil. Brain and heart tissue from 12 chickens seropositive for T. gondii were processed using peptic digestion technique for parasite isolation. From 12 samples subjected to mouse bioassay, nine isolates were obtained. RFLP-PCR genotypic characterization was performed using 11 genetic markers: SAG1, 5'-3'SAG2, alt.SAG2, SAG3, BTUB, GRA6, c22-8, c29-2, L358, PK1 and Apico. Genetic characterization of the isolates revealed the presence of five atypical genotypes according to ToxoDB (# 11, # 55, # 64, # 140 and # 163). Our results showed a wide genetic diversity of T. gondii in free-range chickens in this region.(AU)

Galinhas criadas ao ar livre podem ingerir oocistos de T. gondii presentes no ambiente e, com isso, albergar cepas virulentas desse parasita em diferentes tecidos, sem sinais clínicos. O isolamento de T. gondii por meio de bioensaios em camundongos e gatos, a partir de tecidos de galinhas naturalmente infectadas, tem sido descrito em vários países. Isso demonstra a importância das galinhas caipiras na epidemiologia desse parasita. O objetivo deste trabalho foi caracterizar genotipicamente isolados de T. gondii obtidos de galinhas caipiras naturalmente infectadas em uma área rural do município de Santa Maria, estado do Rio Grande do Sul, Brasil. Fragmentos de cérebro e de coração, de 12 galinhas soropositivas para T. gondii, foram processados pela técnica de digestão péptica para isolamento do parasita. Das 12 amostras submetidas a bioensaio com camundongos, nove isolados foram obtidos. A caracterização genotípica por RFLP-PCR foi realizada utilizando-se 11 marcadores genéticos: SAG1, 5'-3'SAG2, alt.SAG2, SAG3, BTUB, GRA6, c22-8, c29-2, L358, PK1 e Apico e revelou a presença de cinco genótipos atípicos de acordo com o ToxoDB (# 11, # 55, # 64, # 140 e # 163). Os resultados mostraram uma ampla diversidade genética de T. gondii em galinhas caipiras nessa região.(AU)

Methionine synthase A2756G polymorphism associated with an increased risk of head and neck cancer

Background:The 5-methyltetrahydrofolate-homocysteine methyltransferase gene (MTR) encodes the methionine synthase enzyme (OMIM 156570). Methionine synthase synthesizes methionine by re-methylation of homocysteine. A single nucleotide variation MTR-A2756G may affects the function of methionine synthase enzyme, which could lead to the development of head and neck squamous cell carcinoma (HNSCC).Methods:In current study, 292 HNSCC patients and 324 normal individuals without any history of cancer (control) were enrolled. EDTA whole blood samples of patients and control individuals were collected, and DNA was extracted. All samples were genotyped for MTR-A2756G polymorphism using polymerase chain reaction-restriction fragment length polymorphism. Frequency of polymorphism was compared between HNSCC patients and control individuals. The association of MTR-A2756G polymorphism with risk factors was statistically analysed through multivariate analysis (multiple logistic regression) whereas univariate analysis (chi square) was performed for group comparisons.Results:Univariate analysis revealed that the frequency of groups like age, smoking and MTR-A2756G genotype was different in HNC patients and controls (p value <0.05). Multivariate analysis showed that smoking (adjusted OR, 3.7; 95% CI, 2.3-6.0), age groups 41-50 years (adjusted OR, 3.6; 95% CI, .9-6.7) and >60 years (adjusted OR, 3.5; 95% CI, 1.7-7.3), MTR-A2756G genotype (adjusted OR, 2.1; 95% CI, 1.3-3.5) is associated with increased risk of HNSCC.Conclusions:Our data suggests that the MTR-A2756G polymorphism is associated with the occurrence of HNSCC in Pakistani population while the individuals between 40 to 50 years of age and tobacco smokers are at a greater risk of developing HNSCC.

Caracterização do gene do choque térmico (HSP-70. 1) e sua relação com características de produção em bovinos leiteiros criados no semiárido brasileiro / Characterization of the thermal shock gene (HSP-70. 1) and its relationship with production characteristics in dairy cattle reared in the Brazilian semiarid

Objetivou-se com este trabalho avaliar a diversidade genética do gene HSP-70.1 e associar os polimorfismos encontrados com a performance de vacas leiteiras das raças Holandesa, Girolando (5/8H-G) e Sindi criadas em região do semiárido brasileiro. Os polimorfismos foram identificados e avaliados pela técnica de PCR-RFLP, usando-se a enzima de restrição EcoRII. Avaliou-se a variabilidade genética por meio do índice de diversidade padrão e da análise de variância molecular (AMOVA). Os polimorfismos identificados foram avaliados sobre as características de produção de leite. Foram identificados sete alelos, os quais demonstraram que houve polimorfismo para a região gênica analisada, e alguns alelos foram compartilhados entre os rebanhos. As raças bovinas Holandesa e Sindi foram similares geneticamente para o gene analisado. A AMOVA demonstrou que há variação genética entre os rebanhos e dentro deles, com a maior parte da variação ocorrendo dentro dos rebanhos para todos os grupos avaliados. Houve efeito dos alelos identificados sobre a produção de leite dos rebanhos das raças Holandesa (P<0,0001) e Girolando (P<0,0117). O gene HSP-70.1 foi polimórfico na população de bovinos leiteiros estudada, sendo, portanto, um marcador molecular promissor para avaliar a produção de leite de raças criadas em região semiárida.(AU)

The objective of this work was to evaluate the genetic diversity of the HSP-70.1 gene and to associate the polymorphisms found with the performance of Holstein, Girolando (5/8H-G) and Sindi dairy cows raised in region of the Brazilian semiarid. Polymorphisms were identified and evaluated using the PCR-RFLP technique using the EcoRII restriction enzyme. Genetic variability was evaluated using the standard diversity index and molecular variance analysis (AMOVA). The identified polymorphisms were evaluated on the characteristics of milk production. They were identified from the seven alleles, demonstrating that there was polymorphism for the analyzed gene region and some alleles were shared among the herds. The Holstein and Sindi bovine breeds were genetically like the analyzed gene. AMOVA demonstrated that there is genetic variation between and within the herds, with most of the variation occurring within the herds for all groups evaluated. There was effect of the alleles identified on the production of milk herds of Holstein and (P<0.0001) Girolando (P<0.0117) breeds. The HSP-70.1 gene was polymorphic in the population of dairy cattle studied, and therefore a promising molecular marker to evaluate milk production of breeds created in semiarid regions.(AU)

Further insights into the eco-epidemiology of American cutaneous leishmaniasis in the Belem metropolitan region, Pará State, Brazil

Abstract INTRODUCTION: In the Belém Metropolitan Region (BMR), Pará State, Brazil, American cutaneous leishmaniasis (ACL) is endemic; however, very little is known regarding its causative agents. Therefore, we used our standard diagnostic approach combined with an RNA polymerase II largest subunit (RNAPOIILS)-polymerase chain reaction (PCR) followed by analysis of restriction fragment length polymorphism (PCR-RFLP) to identify Leishmania spp. ACL agents in this region. METHODS: Thirty-two Leishmania spp. isolates from patients with ACL in the BMR during 1995-2018 were analyzed. Leishmania spp. DNA samples were amplified using the primers RPOR2/RPOF2, and the 615-bp PCR products were subjected to enzymatic digestion using TspRI and HgaI endonucleases. RESULTS: ACL etiological agents in the BMR comprised Leishmania (Viannia) lindenbergi (43.7%) followed by Leishmania (Viannia) lainsoni (34.4%), Leishmania (Leishmania) amazonensis (12.5%), and Leishmania (Viannia) braziliensis (9.4%). CONCLUSIONS: To our knowledge, the results of the study revealed for the first time that L. (V.) lindenbergi and L. (V.) lainsoni are the main ACL agents in BMR.

Application of Polymerase Chain ReactionRestriction Fragment Length Polymorphism (PCRRFLP) Technique in the Analysis of MYO1H Single Nucleotide Polymorphism in Malay Mandibular Prognathism Patients

@#Genetic studies have reported the association between polymorphism in MYO1H with mandibular prognathism. MYO1H is found in skeletal muscle sarcomeres and is expressed in the mandibular jaw cartilage signifying its importance during craniofacial development. This study aimed to characterise the genotype and allele of MYO1H single nucleotide polymorphism (SNP) (rs3825393) and to associate the SNP with mandibular prognathism in Class III skeletal malocclusion. This was a casecontrol study, which involved 57 Malay subjects with 30 Class I (control) and 27 Class III skeletal base patients (case). Cephalometric measurements were taken prior to collection of saliva samples. MYO1H SNP (rs3825383) was genotyped using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Chi-square (χ2 ) test was used to compare genotype and allele frequencies between the groups while Hardy-Weinberg Equilibrium (HWE) was applied to assess distribution of genotype frequency in both classes. MYO1H SNP (rs3825393) did not yield significant association with mandibular prognathism with p = 0.33; OR = 0.66; 95% CI = 0.289~1.518, that was reflected by no significant difference in allele (p > 0.05) and genotype (p > 0.05) frequency between control and study group. Nevertheless, AA genotype depicted the highest frequency in both groups. The genotype distribution in both groups was in concordance with HWE (p > 0.05). Our data showed no association of MYO1H SNP (rs3825393) with mandibular prognathism. Interestingly, we observed Allele A representing the major allele in Malay population. Presence of MYO1H SNP (rs3825393) was detected in samples analysed. Larger number of samples is required to confirm the involvement of MYO1H polymorphisms in mandibular prognathism.

Genotyping of Malassezia pachydermatis disclosed genetic variation in isolates from dogs in Colombia / Genotipagem de Malassezia pachydermatis revelou variação genética em isolados de cães na Colômbia

Malassezia pachydermatis is a lipophilic and lipid-dependent yeast mostly isolated from animals' skin; hence, it is regarded as a zoophilic species causing otitis externa in dogs. Aspects associated with its epidemiology and pathogenicity is a matter of interest. This study aimed to conduct a molecular characterization of 43 isolates of M. pachydermatis obtained from dogs with otitis externa. For this purpose, the 5.8S internal transcribed spacer 2 (ITS2) and D1/D2 26S rRNA regions were amplified, sequenced and analyzed using restriction fragment length polymorphism (RFLP) with AluI, CfoI, and BstF5I endonucleases. Phylogenetic analyses revealed that these isolates grouped with the sequence types I, IV and V, previously proposed for M. pachydermatis. Interestingly, we found a new polymorphic RFLP pattern using BstF5I, these isolates were associated with the sequence types IV and V, nevertheless an association between polymorphic RFLP patterns, and fosfolipase activity or canine population data was not observed. These findings underline the genetic diversity of M. pachydermatis and provide new insights about the epidemiology of this species in the analyzed population.(AU)

Malassezia pachydermatis é uma levedura lipofílica e dependente de lipídios, principalmente da pele de animais. Sendo, por essa razão, considerada uma espécie zoofílica e causadora de otite externa em cães. Neste sentido, aspectos associados à sua epidemiologia e patogenicidade constituem um tema de interesse científico. O objetivo deste estudo foi realizar a caracterização molecular de 43 isolados de M. pachydermatis obtidos a partir de cães com otite externa. Para esta propósito, foram amplificadas, sequenciadas e analisadas com enzimas de restrição as regiões do gene 5.8S, do espaçador interno transcrito 2 (ITS2) e D1/D2 do 26S do rRNA pelo método RFLP, com as endonucleases AluI, CfOI e BstF5I. Análises filogenéticas revelaram que os isolados se agruparam com as sequências tipo I, IV e V de M. pachydermatis como já descrito anteriormente. De maneira interessante, se observou um novo RFLP polimórfico utilizando BstF5I. Os isolados que mostraram esse padrão foram associados com os padrões IV e V. No entanto, não foi observada associação entre padrões polimórficos de RFLP e atividade de fosfolipase ou dados da população canina. Estes resultados demonstram a diversidade genética de M. pachydermatis e fornecem novas perspectivas sobre a epidemiologia destas espécies na população analisada.(AU)

Identification of Bovine Growth Hormone (BGH) Gene Polymorphism Using PCR-RFLP Method in Buffalo Bulls

Growth Hormone (GH) is a single polypeptide chain synthesised and secreted from anterior pituitary gland by somatroph cells. The product of GH gene hastens metabolism and promotes the growth of many organs and tissues especially bone, muscle and visceral organs. It also regulates growth, mammary gland development and lactation. Polymorphism in this gene is associated with increase in growth and development of many tissues in the body. Aim: The objective of this study was to investigate the polymorphism of bovine growth hormone (bGH) gene in buffalo bulls (Bubalus bubalis) using the PCR-RFLP (polymerase chain reaction–restriction fragment length polymorphism) technique. Design: Genomic DNA was extracted from a total of 10 bulls, consisting of Murrah – Swamp crossbred and pure Swamp buffalo bulls. A The 446 segment of the bGH gene was amplified. The DNA amplicons were detected in 2% agarose gel following 45 minutes of electrophoresis. They were thereafter digesting with AluI endonuclease restriction enzyme, and the digested DNA were detected in 2% agarose gel following electrophoresis for about 45minutes in all samples Results: Similar bands of approximately 300 and 146-bp each, with no variation, were detected in 2% agarose gel following electrophoresis in all the animals tested. Conclusion: Based on the Alu1 digestion result, all samples produced the same allele of the gene, with no polymorphism detected.

Detección molecular de Leishmania (Viannia) lainsoni Silveira, Shaw, Braga & Ishikawa, 1987 (Kinetoplastida: Trypanosomatidae) en humanos de Paraguay

RESUMEN La leishmaniasis es una de las enfermedades tropicales más desatendidas, causada por el parásito Leishmania. En Paraguay, la especie responsable de la leishmaniasis cutánea es (LC) es L. (Viannia) braziliensis. Aquí se reporta un caso diagnosticado de Leishmaniasis, y análisis moleculares empleando reacción en cadena de la polimerasa - polimorfismos de restricción de fragmentos de restricción (PCR-RFLP) demostraron que el caso fue causado por L. (V.) lainsoni. Este es el primer registro de esta especie para Paraguay, con lo cual se extiende el rango de distribución conocido de la especie, unos 1.430 km al sur de localidades previamente conocidas. Se necesitan más estudios para conocer la incidencia real de esta especie en casos de LC en Paraguay, y para identificar reservorios naturales del parásito en la naturaleza.

ABSTRACT Leishmaniasis is one of the most neglected tropical diseases worldwide caused by the parasite Leishmania. In Paraguay the species responsible for cutaneous leishmaniasis (CL) is L. (Viannia) braziliensis. Here we report a case diagnosed with Leishmaniasis, and molecular analyses using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) demonstrate that the case was caused by L. (V.) lainsoni. This is the first record of this species for Paraguay, with which we extend the distribution range of the parasite 1,430 km southwards from the southernmost previous known locality. More studies are needed to know the actual incidence of this species in cases of CL in Paraguay, and to identify natural reservoirs in the wild.

Distribution of Chlamydia trachomatis omp A genotypes in patients attending a sexually transmitted disease outpatient clinic in New Delhi, India

Background & objectives: Limited data are available on the typing of Chlamydia trachomatis in India. Serovars D to K of C. trachomatis are chiefly responsible for urogenital infections. Thus, this study was conducted to determine the distribution of C. trachomatis serovars in patients with urogenital infections and to characterize omp A gene of the detected C. trachomatis isolates by sequence analysis. Presence of other co-infections was also evaluated. Methods: Endocervical swabs were collected from 324 women and urethral swabs/urine were collected from 193 men attending the sexually transmitted diseases outpatient clinic. The samples were screened for C. trachomatis by cryptic plasmid PCR and omp A gene PCR. Genotyping was performed by PCR-restriction fragment length polymorphism (RFLP) and sequencing of the omp A gene. Samples were screened for genital mycoplasmas, Neisseria gonorrhoeae, Treponema pallidum and human immunodeficiency virus (HIV). Results: C. trachomatis was found in 15.0 per cent men and 10.8 per cent women. Serovar D was the most prevalent followed by serovars E, F, I and G. Twenty two C. trachomatis isolates were selected for omp A gene sequencing. No mixed infection was found. Variability in omp A sequences was seen in 31.8 per cent cases. Both PCR-RFLP and omp A gene sequencing showed concordant results. The presence of Ureaplasma spp. and Mycoplasma hominis was observed in 18.7 and 9.5 per cent patients, respectively. Co-infection of C. trachomatis was significantly associated with Ureaplasma urealyticum and HIV. Interpretation & conclusions: The high occurence of C. trachomatis infections warrants its screening in addition to other sexually transmitted infections namely U. urealyticum and HIV. Genotyping of the omp A gene may provide additional information for vaccine development.