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1.
Rev. méd. Chile ; 126(1): 27-31, ene. 1998. ilus
Article in Spanish | LILACS | ID: lil-210406

ABSTRACT

Background: In man, blood groups are polymorphic genetic systems. Maternal fetal incompatibility phenomena should lead to an elimination rather than a maintenance of these polymorphisms. Apossible mechanism that could explain the persistence of these polymosphisms in natural populations is a selective reproductive advantage of heterozygous individuals. Aim: To explore the relationship between maternal heterozygosity for five blood grups and some obstetrical variables related to gestational success. Material and methods: Using a case control design, to every mother giving birth to a malformed child a consecutive mother, whose offspring was normal, was assigned as control. All women were typified for ABO, Rh, kidd, MNSs and Duffy blood groups. Results: Two hundred two women were studiend. There was only one stillbirth, born from a heterozygous mother for all analyzed loci. Mothers that were heterozygous or homozygous for all loci had a higher frequency of malformed children. Women homozygous for all loci had a higher frequency of living offspring than the rest of the sample. Conclusions: Heterozygous mothers for these genetic systems have a reproductive disadvantage


Subject(s)
Humans , Female , Infant, Newborn , Genetic Carrier Screening , Blood Group Antigens/genetics , Reproduction/genetics , Congenital Abnormalities/genetics , Reproductive History , Heterozygote , Homozygote , Isoantibodies/isolation & purification , Genetics, Medical , ABO Blood-Group System/genetics , Kidd Blood-Group System/genetics , Duffy Blood-Group System/genetics , MNSs Blood-Group System/genetics , Rh-Hr Blood-Group System/genetics
2.
Rev. Assoc. Med. Bras. (1992) ; 41(2): 139-40, mar.-abr. 1995. tab
Article in English | LILACS | ID: lil-154762

ABSTRACT

Em casos de investigaçäo de parentesco, a possibilidade de ocorrência simultânea de eventos populacionalmente raros deve ser cogitada. Objetivo. Relatar um caso em que coexistiram recombinaçäo HLA-A/B e homozigosidade para alelo silencioso característico de negros numa pessoa aparentemente sem esta miscigenaçäo. Métodos. Suposto pai, mäe e filhos gêmeos dizigóticos foram racialmente classificados por seu caracteres somáticos aparentes. Fenotiparam-se marcadores genéticos de grupos sanguíneos dos sistemas ABO, Rh, MNS, Kell, Duffy, HLA-A, -B; a genotipagem do sistema HLA da mäe foi feita pelo exame de seus pais. REsultados. O fenótipo da mäe, branca, no sistema MNS, foi M+, N-;S-;s-. Houve compatibilidade fenotípica entre o suposto pai e ambos os gêmeos. A maternidade presumida em relaçäo a ambas as crianças seria possível se a mäe apresentasse uma recombinaçäo HLA-A/B. Conclusäo. Em populaçöes miscigenadas, a dissociaçäo entre caracteres somáticos aparentes e marcadores de grupos sanguíneos é previsível. Devem-se estimar as freqüências alélicas/haplotípicas destas populaçöes. Casuisticamente, a associaçäo de eventos de baixa freqüência populacional pode ser a causa de aparentes exclusöes de parentesco


Subject(s)
Humans , Male , Female , HLA-A Antigens/genetics , HLA-B Antigens/genetics , Phenotype , Recombination, Genetic , Alleles , Genetic Markers , Paternity , MNSs Blood-Group System/genetics
5.
Ceylon Med J ; 1991 Mar; 36(1): 17-9
Article in English | IMSEAR | ID: sea-48768

ABSTRACT

MNSs blood grouping was done on a random sample of 700 blood donors at the Central Blood Bank and at some of the Mobile Units, from September 1980 to August 1981. The distribution of M,N, Ss and combined MNSs phenotypes and their corresponding genotypes among Sri Lankans was evaluated. The frequencies of these phenotypes are different from those of Caucasians. The significance of MNSs blood grouping in the investigation of doubtful paternity is discussed.


Subject(s)
White People/genetics , Female , Humans , MNSs Blood-Group System/genetics , Male , Paternity , Phenotype , Sri Lanka
6.
Arch. invest. méd ; 18(1): 13-24, ene.-mar. 1987. tab
Article in Spanish, English | LILACS | ID: lil-55958

ABSTRACT

Con el propósito de contribuir al conocimiento de la composición genética de las poblaciones humanas en el Estado de Nuevo León y basándose en el hecho de que los análisis de las frecuencias relativas de diferentes características genéticas en grupos de personas que sufren de varios estados de enfermedad han ayudado para indicar el componente genético que, a un mayor o menor grado están presentes en la mayoría de las enfermedades humanas, fueron analizadas las frecuencias para los grupos sanguíneos ABO, Rh(D), MN y Jell, así como la habiliddad para gustar la feniltiocarbamida (FTC), la presencia de vellos en la falange media, uso de las manos y la preferencia para el cruzado de manos y brazos, en 350 pacientes que padecían asma, rinitis alérgica (fiebre de heno) y diferentes alergias de piel, y 172 personas testígos comparadas por edad y sexo. Pacientes con rinitis mostraron frecuencias más altas de los grupos sanguíneos M y K(-), sensibilidad positiva a la FTC, presencia de vello en la falange digital media, cruzado izquierdo de mano y brazo. Pacientes con asma tenían alta frecuencia de grupo sanguíneos Rh(+) y K(-) y personas con alergias de piel mostraron altos porcentajes de grupo sanguíneo M


Subject(s)
Humans , Genetics, Population , Blood Group Antigens/genetics , Mexico , Kell Blood-Group System/genetics , MNSs Blood-Group System/genetics , Rh-Hr Blood-Group System/genetics
7.
Rev. cuba. med ; 25(12): 1246-54, dic. 1986. tab
Article in Spanish | LILACS | ID: lil-51934

ABSTRACT

Se realiza un estudio comparativo de los sistemas ABO y Rh- (D) entre dos grupos; uno control (seleccionado mediante un muestreo irrestricto aleatorio en el municipio de Pinar del Río) y otro de pacientes afectados de diabetes mellitus tipo II. Los resultados de las comparaciones no fueron significativos y se concluye que parece no existir asociación de estos sistemas con la entidad ya descrita. Se informan las frecuencias del sistema MN en el grupo de pacientes y no se comparan con ningún grupo por no existir trabajos precedentes en la provincia


Subject(s)
Humans , ABO Blood-Group System/genetics , Diabetes Mellitus, Type 2 , MNSs Blood-Group System/genetics , Rh-Hr Blood-Group System/genetics
8.
Rev. bras. genét ; 9(1): 179-85, mar. 1986. tab
Article in Portuguese | LILACS | ID: lil-37394

ABSTRACT

Os grupos sangüíneos dos sistemas ABO, MNSs e Rh (incluindo a variante D**u) foram estudados em uma amostra de 1259 recrutas brasileiros (941 caucasóides e 318 negróides) de Campinas, Estado de Säo Paulo, Brasil. Foram estimadas as seguintes freqüências gênicas para os caucasóides: A1 = 0,1808, A2 = 0,0543, B = 0,0698, O = 0,06951; M = 0,5627, N = 0,4373; R**O = 0,1094, R**1 = 0,4179, R**2 = 0,1515, R**z = 0,0052, r = 0,2975, r'=0,0155, r" = 0,0030. Entre os negróides, essas freqüências gênicas foram as seguintes: A1 = 0,1384, A2 = 0,0547, B = 0,0854, O = 0,7215; M = 0,5597, N = 0,4403; R**0 = 0,2781, R**1 = 0,2917, R**2 = 0,1523, R**z = 0,0049, r = 0,2676, r'=0,0054. A freqüência do gene D**u) foi estimada em 0,0063 entre os caucasóides e em 0,0055 entre os negróides


Subject(s)
ABO Blood-Group System/genetics , Gene Frequency , MNSs Blood-Group System/genetics , Rh-Hr Blood-Group System/genetics , Brazil
10.
Southeast Asian J Trop Med Public Health ; 1979 Jun; 10(2): 209-11
Article in English | IMSEAR | ID: sea-34812

ABSTRACT

Blood and saliva from unselected blood donors at the Blood Bank, Siriraj Hospital were studied. Two Kell positive, two Rh negative and one Gerbiech negative were found, which could be considered as rare blood type in Thailand. The commonest Rh gene complex was CDe (R11 and the presence of CDE (Rz) in this study are the usual pattern of people in Southeast Asia. Fya is very common as in other people of Asia. In the Lewis system, the incidence of Le (a + b -) was 28.48% which agree well with our previous report 30.9%. There were 410 out of 1,668, (23.17%) who were found to be Lea non-secretor and 95 of them have Lewis antibodies in their sera. Aberrant secretion patterns were also found in this study, 5 people were found to secrete A or B substances according to their blood groups but no H substance was detectable. Further investigation of Lewis groups and secretion in Thailand are needed.


Subject(s)
Blood Donors , Blood Group Antigens/genetics , Duffy Blood-Group System/genetics , Humans , Kell Blood-Group System/genetics , Lewis Blood Group Antigens/genetics , MNSs Blood-Group System/genetics , P Blood-Group System/genetics , Phenotype , Rh-Hr Blood-Group System/genetics , Thailand
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