The rs1477196 SNP of the FTO Gene is Associated with Primary Knee Osteoarthritis in a Female Population from Northern Mexico

ABSTRACT Background: Osteoarthritis is a frequent rheumatic disease. Some single-nucleotide polymorphisms of the gene associated with fat mass and obesity are associated with increased body mass index and knee osteoarthritis. Objective: The objective of this study was to analyze the association of single nucleotide polymorphism rs1477196 of the fat mass and obesity gene with primary knee osteoarthritis. Methods: This observational and cross-sectional study included 347 Mexican participants. We performed the genotypification analysis with TaqMan® probe C_2031262_10 for rs1477196 (Thermo Fisher Scientific). Multivariate analysis included covariables such as age, type 2 diabetes, obesity, and postmenopause. Results: Type 2 diabetes, obesity, and postmenopause were associated with primary knee osteoarthritis in female participants. We did not find an association between rs1477196 and obesity. In the codominant and dominant genetic models, rs1477196 was significantly associated with primary knee osteoarthritis only in the female group, including in the model adjusted by other covariables (odds ratio = 2.517; 1.035-6.123; p = 0.042 and odds ratio = 2.387; 1.054-5.407; p = 0.037, respectively). The interaction between rs1477196 and obesity was significantly associated with primary knee osteoarthritis in female participants (p = 0.039 and p = 0.043). Conclusions: Our findings suggest that the rs1477196 variant of the fat and obesity mass gene may be associated with the risk of primary knee osteoarthritis in women.

Body fat, cardiovascular risk factors and polymorphism in the FTO gene: randomized clinical trial and different physical exercise for adolescents

Abstract Objective: To investigate the effects of different physical exercise programs and polymorphisms of the FTO (fat mass and obesity-associated gene) on body composition and cardiovascular risk factors in adolescents with overweight and obesity. Methods: A randomized, parallel, double-blind clinical trial consisting of the adolescent overweight from the state public network, in a simple representative random sample, who participated in an aerobic exercise or weight training intervention for 10 weeks. Anthropometry, body composition, biochemical markers, sexual maturation, and rs9939609 polymorphism in the FTO gene were assessed. 347 adolescents had their characterization of nutritional status. 72 individuals with overweight and obesity were invited to participate. 39 remained for the start of the program and were randomly allocated to both types of intervention. In the end, 26 subjects participated in the intervention programs, with 12 and 14 in the aerobic and weight training programs, respectively. Results: Heterozygous and homozygous bearers of risk allele A participating in the aerobic program showed improvements in glycemia (p = 0.002) and total cholesterol (p = 0.023) and a reduction in body fat mass (p = 0.041). The weight training program reduced glycemia in patients with the risk allele A (p = 0.027). Cameron's stage four sexual maturation participants were 2.1 times more likely to improve their body fat (CI = 1.31-3.39). Conclusion: Aerobic exercises produced exclusively a significant decrease in fat mass and total cholesterol in patients with risk allele A. Distinct physical exercise programs may cause diverse changes in risk variables related to the health of adolescents.

m 6A RNA Methylation Decreases Atherosclerotic Vulnerable Plaque Through Inducing T Cells

ABSTRACT Introduction: Knockdown of fat mass and obesity-associated gene (FTO) can induce N6-methyladenosine (m 6A) ribonucleic acid (RNA) methylation. The objective of this study was to explore the effect of m 6A RNA methylation on atherosclerotic vulnerable plaque by FTO knockdown. Methods: A total of 50 New Zealand white rabbits were randomly divided into pure high-fat group, sham operation group, vulnerable plaque group, empty load group, and FTO knockdown group (10 rabbits/group). Results: Flow cytometry showed that helper T (Th) cells in the FTO knockdown group accounted for a significantly higher proportion of lymphocytes than in the vulnerable plaque group and empty load group (P<0.05). Th cells were screened by cell flow. The level of m 6A RNA methylation in the FTO knockdown group was significantly higher than in the vulnerable plaque group and empty load group (P<0.05). The levels of total cholesterol, triglyceride, and low-density lipoprotein C were higher at the 12th week than at the 1st week, but the high-density lipoprotein C level was lower at the 12th week than at the 1st week. At the 12th week, the interleukin-7 level was significantly lower in the adeno-associated virus-9 (AVV9)-FTO short hairpin RNA group than in the control and AVV9-green fluorescent protein groups (P<0.001). Conclusion: After successfully establishing a vascular parkinsonism rabbit model, m 6A RNA methylation can decrease Th cells and vulnerable atherosclerotic plaques.

Effects of RNA demethylase FTO inhibitor on function ofglioblastoma stem cells / 中国药理学通报

Aim To investigate the effect of m6A demethylase FTO inhibitor(FB23-2)on human glioblastoma stem cell activity. Methods The effects of FB23-2 and Temozolomide on GSC were detected by CCK-8 assay and neurosphere formation assay. The effect of FB23-2 on self-renewal of GSC was detected by limited dilution assay in vitro. The effect of FB23-2 on the proliferation of GSC was detected by EdU method. The effect of FB23-2 on apoptosis of glioblastoma stem cells was detected by flow cytometry. Results CCK-8 assay showed that FB23-2 could effectively inhibit the cell viability of GSC with IC50 values of 7.11 μmol·L-1 and 4.63 μmol·L-1,respectively. The size and number of GSC neural sphere in FB23-2 treatment group were significantly reduced compared with control group. In vitro limited dilution experiment showed that FB23-2 effectively inhibited the self-renewal ability of GSC. EdU incorporation experiment showed that compared with the control group,the treatment group decreased to(70.59±13.74)% and(50.33±4.53)%,respectively. The apoptotic rates of the treated group were(12.16±1.90)% and(16.77±1.17)% by flow cytometry. Conclusions FTO inhibitor FB23-2 can effectively inhibit GSC growth,self-renewal and the formation of neural sphere. In addition,FB23-2 can inhibit the proliferation of GSC and induce its apoptosis.

Obesidade genética não sindrômica: histórico, fisiopatologia e principais genes / Non-syndromic genetic obesity: history, pathophysiology and key genes

A obesidade é definida pelo excesso de gordura corporal acumulada no tecido adiposo quando o indivíduo atinge valores de IMC igual ou superior a 30 Kg/m2. Constitui um dos principais fatores de risco para várias doenças não transmissíveis (DNTs) como por exemplo, diabetes mellitus tipo 2 (DM2), doenças cardiovasculares, hipertensão arterial, acidente vascular cerebral e até mesmo o câncer. Embora a obesidade esteja diretamente relacionada com o consumo calórico excessivo em relação ao gasto energético diário, sua etiologia pode estar associada aos baixos níveis de atividade física, às alterações neuroendócrinas e aos fatores genéticos. Considerando o componente genético, esta pode ser classificada como sindrômicas e estar associada às alterações cromossômicas estruturais ou numéricas, ou como não sindrômica, quando relacionada, principalmente, com os polimorfismos de nucleotídeos simples (SNPs) em alelos que atuam como herança monogênica, ou ainda com a interação vários genes (poligênica multifatorial). Apesar de existirem muitas etiologias diferentes, normalmente a obesidade é tratada a partir da mesma abordagem, desconsiderando a fisiologia que a desencadeou. Dessa forma, o objetivo do presente trabalho foi abordar a obesidade genética não sindrômica por meio a) da descrição breve de perspectiva histórica sobre seu entendimento; b) da exposição dos principais mecanismos moleculares envolvidos com o controle de peso; c) da compilação dos principais genes e SNPs relacionados; d) da definição dos principais genes; e e) da abordagem das principais perspectivas de intervenção.

Obesity is defined as excess body fat accumulated in the adipose tissue when the individual reaches BMI values equal to or greater than 30 kg/m2. It is one of the main risk factors for several non-communicable diseases (NCDs), such as Type 2 Diabetes mellitus (T2D), cardiovascular diseases, high blood pressure, stroke and even cancer. Although obesity is directly related to excessive calorie intake in relation to daily energy expenditure, its etiology may be associated with low levels of physical activity, neuroendocrine changes, and genetic factors. Considering the genetic component, it can be classified as syndromic and be associated with chromosomal or numerical changes, or as non-syndromic and being related mainly to single nucleotide polymorphisms (SNPs) in alleles that act as monogenic inheritance, or with an interaction of several genes (multifactorial polygenic). Although there are many different etiologies, obesity is usually treated using the same approach, disregarding the physiology that triggered it. Thus, the aim of this study was to address non-syndromic genetic obesity through a) a brief description of a historical perspective on its understanding; b) the exposure of the main molecular mechanisms involved in weight control, c) the compilation of the key genes and related SNPs, d) the definition of the key genes and e) the approach of the main intervention representations.

Evaluation of Lipid Profile and Some Renal Parameters in Some Selected Ethnic Population with Fat-mass and Obesity-associated Gene (FTO) Variants in Niger Delta, Nigeria

Aim: To evaluate lipid profile and some renal parameters in some selected ethnic population with fat-mass and obesity-associated gene (FTO) variants in Niger Delta, Nigeria. Study Design: Case-controlled observational study. Place and Duration of Study: Federal Medical Centre, Asaba, Delta State and Safety Molecular Pathology Laboratory, Enugu, Nigeria, between March 2020 and February 2022. Methodology: Changes in lipid profile and some renal parameters in FTO gene was studied in ninety-eight (98) type 2 diabetes (T2D) subjects (78 cases and 20 controls) from four different tribes in the Niger Delta region, Nigeria. Multistage sampling method was employed in the subject selection. The subjects were first separated into two groups – new cases (less than a year of diagnosis as Diabetic) and old cases (one year & above). Equal number of samples was then randomly collected from each of the cluster groups. 10mls of blood was collected into plain bottles for the assay of the above-named markers, and were assayed using spectrophotometric and ELISA methods. The data were analyzed using GraphPad Prism, version 8.0.2 and p values less than .05 were considered statistically significant. Results: The results showed that the Ijaw tribe had the highest mean total cholesterol (TCHOL), low density lipoproteins (LDL), Castelli Risk Ratio (CRR), atherogenic coefficient (AC) values (5.36 ± 0.99, 3.36 ± 0.87 mmol/l,3.76 ± 1.18 and 2.86 ± 1.16) respectively, which were significantly higher (P<.05) than those of the control group, while the Urhobo tribe had the highest mean TG and AIP values (1.47 ± 0.51 mmo/l and 0.08 ± 0.01), The control subjects had the highest mean HDL values (1.51 ± 0.49mmo/l), which were significantly higher(P<.05) than that of the control subjects. Mean creatinine level was highest in the control group (101.1 ± 21.24 µmol/L), while the Urhobo tribe had the highest mean MDRD levels (94.15 ±36.17 ml/min). Special diets did not contribute to any significant difference in the biochemical indices of the subjects apart from significant changes in the levels of triglyceride. Conclusion: From the results, we conclude that the levels of lipid profile varied with the tribe for subjects with FTO variants and control subjects and only triglyceride levels are affected by specific diets.

The effect of fat mass and obesity associated proteins mediated mRNA m6A modification on animal fat deposition and its application prospects / 生物工程学报

In the process of animal fat deposition, the proliferation and differentiation of pre-adipocytes and the change of lipid droplet content in adipocytes are regulated by a series of transcription factors and signal pathways. Although researchers have conducted in-depth studies on the transcriptional regulation mechanisms of adipogenesis, there are relatively few reports on post-transcriptional modification on mRNA levels. The modification of mRNA m6A regulated by methyltransferase, demethylase and methylation reading protein is a dynamic and reversible process, which is closely related to fat deposition in animals. Fat mass and obesity associated proteins (FTO) act as RNA demethylases that affect the expression of modified genes and play a key role in fat deposition. This article summarized the mechanism of FTO-mediated demethylation of mRNA m6A in the process of animal fat deposition, suggesting that FTO may become a target for effective treatment of obesity. Moreover, this review summarized the development of FTO inhibitors in recent years.

FTO improves myocardial fibrosis by reducing m6A modification of DKK2 and promoting DKK2 expression / 西安交通大学学报(医学版)

【Objective】 To explore the relationship of fat mass and obesity-associated protein (FTO) with the m6A modification and expression level of DKK2 in the process of myocardial fibrosis. 【Methods】 Cardiac fibroblasts (CFs) were grouped as follows: Control group, AngⅡ-treated group, AngⅡ+EV group (transfected with empty vector and negative control siRNA and then treated with AngⅡ), AngⅡ+FTO-O group (transfected with FTO overexpression vector and then treated with AngⅡ), and AngⅡ+FTO-O+DKK2 siRNA group (treated with AngⅡ after co-transfection of FTO overexpression vector and DKK2 siRNA). Mice were divided into the following groups: Control group (sham operation group), AMI group (constructing acute myocardial infarction model), AMI+EV group (AMI mice were intraperitoneally injected with nanoparticles containing empty vector), and AMI+FTO-O group (AMI mice were intraperitoneally injected with nanoparticles containing FTO overexpression vector). Then, the expressions of FTO and DKK2 were detected by fluorescence quantitative PCR and Western blotting, the m6A modification level of DKK2 was detected by RNA binding protein immunoprecipitation, the cell viability was detected by CCK-8, the cardiac function of AMI mice was evaluated, and the cardiac pathological changes of mice were detected by HE and Masson staining. 【Results】 AngⅡ inhibited the expression of FTO, thereby enhancing the m6A modification level of DKK2 and downregulating the expression of DKK2 (P<0.05). AngⅡ promoted cell viability and enhanced the expressions of α-SMA, collagen Ⅰ and collagen Ⅲ (P<0.05). FTO overexpression significantly blocked the above-mentioned regulatory effects of AngⅡ (P<0.05), but DKK2 siRNA could antagonize the effect of FTO overexpression on AngⅡ. The expressions of FTO and DKK2 were downregulated in AMI mice, and the m6A modification level of DKK2 was increased (P<0.05). When FTO was overexpressed, the expressions of FTO and DKK2 in AMI mice were significantly restored, the m6A modification level of DKK2 and myocardial fibrosis were significantly reduced (P<0.05), and the cardiac pathological changes were significantly improved. 【Conclusion】 FTO can promote the expression of DKK2 by reducing the m6A modification level of DKK2, thereby inhibiting the progression of myocardial fibrosis. This indicates that FTO/DKK2 pathway is a key pathway in regulating myocardial fibrosis.

Detailed resume of RNA m6A demethylases

N6-Methyladenosine (m6A) is the most abundant internal modification in eukaryotic mRNA, playing critical role in various bioprocesses. Like other epigenetic modifications, m6A modification can be catalyzed by the methyltransferase complex and erased dynamically to maintain cells homeostasis. Up to now, only two m6A demethylases have been reported, fat mass and obesity-associated protein (FTO) and alkylation protein AlkB homolog 5 (ALKBH5), involving in a wide range of mRNA biological progress, including mRNA shearing, export, metabolism and stability. Furthermore, they participate in many significantly biological signaling pathway, and contribute to the progress and development of cancer along with other diseases. In this review, we focus on the studies about structure, inhibitors development and biological function of FTO and ALKBH5.

A novel inhibitor of N 6-methyladenosine demethylase FTO induces mRNA methylation and shows anti-cancer activities

N 6-methyladenosine (m6A) modification is critical for mRNA splicing, nuclear export, stability and translation. Fat mass and obesity-associated protein (FTO), the first identified m6A demethylase, is critical for cancer progression. Herein, we developed small-molecule inhibitors of FTO by virtual screening, structural optimization, and bioassay. As a result, two FTO inhibitors namely 18077 and 18097 were identified, which can selectively inhibit demethylase activity of FTO. Specifically, 18097 bound to the active site of FTO and then inhibited cell cycle process and migration of cancer cells. In addition, 18097 reprogrammed the epi-transcriptome of breast cancer cells, particularly for genes related to P53 pathway. 18097 increased the abundance of m6A modification of suppressor of cytokine signaling 1 (SOCS1) mRNA, which recruited IGF2BP1 to increase mRNA stability of SOCS1 and subsequently activated the P53 signaling pathway. Further, 18097 suppressed cellular lipogenesis via downregulation of peroxisome proliferator-activated receptor gamma (PPARγ), CCAAT/enhancer-binding protein alpha (C/EBPα), and C/EBPβ. Animal studies confirmed that 18097 can significantly suppress in vivo growth and lung colonization of breast cancer cells. Collectively, we identified that FTO can work as a potential drug target and the small-molecule inhibitor 18097 can serve as a potential agent against breast cancer.

A ação dos polimorfismos de nucleotídeo único (SNPS) sobre o gene FTO, sua relevância e influência na obesidade: levantamento cienciométrico / The action of single nucleotide polymorphisms (snps) on the fto gene, its relevance and influence on obesity: scientometric survey

A obesidade é caracterizada pelo aumento excessivo da gordura corporal e está ligada ao estilo de vida, ao meio ambiente e a genética do indivíduo. O equilíbrio entre ingestão e gasto energético é controlado por mecanismos neurais, hormonais, químicos e genéticos. Estudos sugerem que o gene FTO (Fat mass and obesity associated) atua como regulador primário do acúmulo de gordura corporal, quando associado a SNPs (Single Nucleotide Polymorphism) específicos, predispõe à obesidade. O propósito deste trabalho foi verificar a produção científica, analisar e catalogar os estudos de polimorfismos no gene FTO associados à obesidade e suas comorbidades. A busca por publicações entre 2009 e 2018 foi realizada na base de dados SciELO com a palavra-chave "FTO". Foram encontrados 23 artigos originais dentro dos critérios da pesquisa que correlacionam o FTO à obesidade. O nome do autor principal, país, idioma, ano de publicação, título, objetivo, polimorfismo associado e os resultados dos estudos foram extraídos e organizados para facilitar a tabulação dos dados. Também foram pesquisados os números de citações de cada artigo, utilizando-se a plataforma Google Acadêmico. Embora o Brasil se encontre em primeiro lugar em produção científica para o gene FTO na base de dados prospectada, o número de artigos originais ainda é muito modesto. Assim, os resultados encontrados podem servir de subsídio no delineamento de novas pesquisas sobre os polimorfismos do gene FTO e as causas da obesidade.

Obesity is characterized by the excessive increase in body fat and is correlated to the lifestyle, environment, and also to the genetics of the individual. The balance between energy intake and expenditure is controlled by neural, hormonal, chemical, and genetic mechanisms. Studies suggest that the FTO (fat mass and obesity associated), a gene associated with fat mass, plays a role as a primary regulator of body fat buildup, when associated to specific Single Nucleotide Polymorphisms (SNPs), causing predisposition to obesity. This paper aimed at reviewing, analyzing, and cataloguing the studies on FTO gene polymorphisms associated with obesity and its comorbidities. The search was carried out in SciELO database, checking articles published between 2009 and 2018 using the keyword "FTO". Twenty-three original articles, matching the research criteria, correlating FTO either positively or negatively with obesity, were found. The main author's name, country, language, year of publication, title, objective, associated polymorphism, and the study results were extracted and organized to facilitate data tabulation. The citation numbers for each article were also searched by using the Google Scholar platform. Although Brazil ranks first in scientific production on the FTO gene in the surveyed database, the number of original articles is still very modest. Therefore, the results found in this paper may be used as a basis for the design of new research on the FTO gene polymorphisms and the causes of obesity.

Effects of FTO and PPARγ variants on intrauterine growth restriction in a Brazilian birth cohort

Intrauterine growth restriction (IUGR) is related to a higher risk of neonatal mortality, minor cognitive deficit, metabolic syndrome, and cardiovascular disease in adulthood. In previous studies, genetic variants in the FTO (fat mass and obesity-associated) and PPARγ (peroxisome proliferator-activated receptor-gamma) genes have been associated with metabolic disease, body mass index, and obesity among other outcomes. We studied the association of selected FTO (rs1421085, rs55682395, rs17817449, rs8043757, rs9926289, and rs9939609) and PPARγ (rs10865710, rs17036263, rs35206526, rs1801282, rs28763894, rs41516544, rs62243567, rs3856806, and rs1805151) single-nucleotide polymorphisms (SNPs) with IUGR, through a case-control study in a cohort of live births that occurred from June 1978 to May 1979 in a Brazilian city. We selected 280 IUGR cases and 256 controls for analysis. Logistic regression was used to jointly analyze the SNPs as well as factors such as maternal smoking, age, and schooling. We found that the PPARγ rs41516544 increased the risk of IUGR for male offspring (OR 27.83, 95%CI 3.65-212.32) as well as for female offspring (OR=8.94, 95%CI: 1.96-40.88). The FTO rs9939609 TA genotype resulted in a reduced susceptibility to IUGR for male offspring only (OR=0.47, 95%CI: 0.26-0.86). In conclusion, we demonstrated that PPARγ SNP had a positive effect and FTO SNP had a negative effect on IUGR occurrence, and these effects were gender-specific.

Parental History of Type 2 Diabetes Mellitus: A Lurking Genetic Threat

Type-2 Diabetes Mellitus (T2DM) is presently the fastest growing disease and has been recognized to be caused by a collision between inherited parental genes and the environment. The current prevalence in Pakistan of type-2 diabetes mellitus is 26.3%. Out of them 19.2% had disease two to three decades back while 7.1% are recently diagnosed cases. Worldwide burden of disease was 415 million in 2015 and this number will increase to 642 million by 2040. Parental history of diabetes mellitus is a chief reason for the development of T2DM in children, but whether this association derives from shared genetic or environmental factors is unclear. Persistent high blood glucose levels can result in drastic outcomes like Diabetic Ketoacidosis and Hyperosmolar non ketotic syndrome. Genome-wide association analyses have uncovered multiple genomic regions associated with T2DM, but identification of the causal variants remains a challenge. This review will discuss the approach of diagnosing T2DM by analyzing the association of gene variants and family history.

Asociación entre el polimorfismo rs9939609 del gen FTO y marcadores de adiposidad en población infantil chilena / Association between FTO gene rs9939609 and adiposity markers in Chilean children

Resumen: Introducción: La obesidad es una enfermedad inflamatoria donde la genética determina cierto nivel de riesgo. Aun cuando existen estudios que reportan asociación entre polimorfismos de FTO (fat-mass associated gene) y adiposidad, existe limitada evidencia en población infantil chilena. Objetivo: determinar la asociación entre el polimorfismo rs9939609 del FTO y marcadores de adiposidad en población in fantil chilena. Pacientes y Método: Estudio de corte transversal incluyó 361 participantes (de 6 a 11 años; 50% niñas). Los datos clínicos y la recolección de muestras de sangre se realizaron entre marzo y junio de 2008. El polimorfismo SNP (rs9939609), del gen FTO, se determinó utilizando ADN genómico extraído de leucocitos, utilizando el Mini Kit QIAamp DNA Blood (Qiagen GmbH, Hilden, Alemania). Los marcadores de adiposidad estudiados fueron, índice de masa corporal (IMC), masa grasa, perímetro de cintura (PC) y razón cintura/talla, y se compararon ajustados por sexo, edad y estadio de Tanner. La asociación entre el polimorfismo estudiado y los marcadores de obesidad se realizó mediante análisis de regresión lineal. Resultados: Al ajustar los marcadores por sexo, edad y estadío de Tanner se observó una asociación significativa entre el polimorfismo e indicadores de adi posidad. Por cada copia extra del alelo de riesgo se encontró un aumento de 2,47 kg de peso corporal, (IC 95%: 1,39-3,55); 1,06 kg/m2 de IMC, (IC 95%: 0,56-1,54); 2,55 cm de PC, (IC 95%: 1,26-3,85) y 1,98% de masa grasa, (IC 95%: 0,78-3,19). Al convertir los marcadores de adiposidad a z-score, la razón perímetro de cintura/talla arrojó la mayor asociación con el alelo de riesgo de FTO. Conclu sión: Este estudio indica asociación entre el polimorfismo rs9939609 del gen FTO con marcadores de adiposidad general y central en población infantil en Chile.

Abstract: Introduction: Obesity is considered a chronic inflammatory disease with an important genetic component. Although several studies have reported an association between the FTO (fat-mass associated gene) and adiposity in children, there is limited evidence in the Chilean population. Objective: To deter mine the association between the polymorphism rs9939609 of the FTO gene and markers of adipo sity in Chilean children. Patients and Method: Cross-sectional study which included 361 children aged between 6 and 11 years (50% were girls). Between March and June 2008, clinical data and blood sample collection was carried out. The rs9939609 single-nucleotide polymorphism (SNP) of the FTO gene, was determined using the genomic DNA extracted from leukocytes, using the QIAamp DNA Blood Mini Kit (Qiagen GmbH, Hilden, Germany).The adiposity markers included were body mass index (BMI), waist circumference (WC), body fat, and WC/H index; which were later compared adjusted by sex, age, and Tanner stage. Linear regression analyses were conducted to detect the association between the polymorphism and obesity markers. Results: After adjusting the models by age, sex, and Tanner stage, we found a significant association between the polymorphism and markers of adiposity. For each extra copy of the risk allele, we found an increase of 2.47 kg body weight (95% CI: 1.39-3.55); 1.06 kg/m2 BMI (95% CI: 0.56-1.54); 2.55 cm WC, (95% CI: 1.26-3.85); and 1.98% body fat (95% CI: 0.78-3.19). When converting adiposity markers to z-score, we found that WC/height index shows the strongest association with the risk allele FTO. Conclusion: This study supports the association between the rs9939609 SNP of the FTO gene and overall and central adiposity markers in Chilean children.

Methyltransferase Like 3 and Fat Mass and Obesity-Associated Protein Are Required for H7N9 Infection in Cell Culture

Background METTL3 (methyltransferase like 3) and FTO (fat mass and obesity-associated protein) are criticalfor establishing and regulating the m6A (N6-methyladenosine) modification, but very little is known about thefunction of m6A in the immune system or its role in interactions within the host immune system.Methods Western blotting experiment was used to check the expression of the host proteins related to m6Amodification after H7N9 influenza virus infection. Immunofluorescence experiment was used to identifywhether the subcellular localization of related proteins. Moreover, we knocked down and over expressendogenous METTL3 or FTO in A549 cells, and then infected the cells with H7N9 to test whethermethyltransferases or demethylases affect H7N9 replication.Result We confirmed that the expression pattern of m6A proteins was altered during H7N9 infection. METTL3and FTO were located in the nucleus, and YTHDF3 was located in the cytoplasm. Furthermore, our resultsdemonstrate that downregulation of METTL3 or FTO expression in A549 cells severely impairs viral proteinexpression and H7N9 infection.Conclusions METTL3 and FTO are critical for H7N9 replication which may represent a new mechanism for thecontrol of H7N9 replication and host-pathogen interactions.

Polimorfismo rs17817449 del gen FTO y su influencia en variables antropométricas de jóvenes chilenos / rs17817449 polymorphism of the fto gene and its influence on anthropometric variables of young Chileans

Determinar la distribución genotípica y la frecuencia alélica del polimorfismo rs17817449 del gen FTO en jóvenes chilenos y su influencia en variables antropométricas. Los 96 sujetos jóvenes (18-25 años), 43 hombres y 53 mujeres fueron evaluados utilizando genotipificación del polimorfismo rs17817449 del gen FTO en TT, TG y GG mediante polimerase chain reaction (PCR), además de una evaluación Kinenatropométrica para determinar las variables asociadas a composición corporal. Las variables fueron analizadas estadísticamente según su distribución paramétrica y el nivel de significancia estadística fue p<0,05. La distribución genotípica del polimorfismo rs17817449 de FTO en jóvenes chilenos fue: TT: 50 %; TG: 42,7 %; GG 7,3 % y la distribución alélica fue: T: 0,7105 y G: 0,2895. No se encontraron diferencias estadísticamente significativas en las variables antropométricas al analizar los participantes según modelo de dominancia del alelo G. Se determinó la distribución genotípica y la frecuencia alélica del polimorfismo rs17817449 del gen FTO en jóvenes chilenos, datos desconocidos hasta este momento. De acuerdo a nuestros resultados, no existen diferencias antropométricas entre personas con diferentes genotipos del polimorfismo rs17817449 de FTO, agrupadas según modelo de dominancia del alelo G.

The rs17817449 polymorphism of the FTO gene in young Chileans and their influence on anthropometric variables. 96 young subjects (18-25 years old), 43 men and 53 women were evaluated using genotyping of the rs17817449 polymorphism of the FTO gene in TT, TG and GG by means of polymerase chain reaction (PCR), in addition to a Kinenatropometric evaluation to determine the variables associated with body composition. The variables were analyzed statistically according to their parametric distribution and the level of statistical significance was p<0.05. The genotypic distribution of the FTO polymorphism rs17817449 in young Chileans was: TT: 50 %; TG: 42.7 %; GG 7.3 % and the allelic distribution was: T: 0.7105 and G: 0.2895. No statistically significant differences were found in the anthropometric variables when analyzing the participants according to model of dominance of the G allele. The genotypic distribution and the allelic frequency of the rs17817449 polymorphism of the gene were determined FTO in Chilean population, data unknown until now. According to our results, there are no anthropometric differences between people with different genotypes of the FTO polymorphism rs17817449, nor according to the dominance model of the G.

Asociación entre el polimorfismo rs9939609 del gen FTO con la ingesta energética, macronutrientes y consumo de alcohol en población chilena / Association of the FTO (rs9939609) genotype with energy intake

Background: Fat-mass-associated-gene (FTO) is associated with higher energy intake and specific food preferences. Aim: To investigate the association of the FTO genotype with energy intake, macronutrient and alcohol consumption. Material and Methods: Four hundred and nine participants of the GENADIO (Genes, Environment, Diabetes and Obesity) study were included. Energy intake, macronutrient and alcohol consumption were the outcomes of interest. The association of FTO (rs9939609) genotype with these outcomes was investigated using linear regression analyses, adjusting for confounding variables. Results: After adjusting for socio-demographic factors, being a carrier of the risk allele for the FTO gene was associated with a higher energy intake (173 kcal per each extra copy of the risk variant [95% confidence intervals (CI): 45; 301], (P = 0.008). After adjusting for lifestyle factors and body mass index, the association was slightly attenuated but remained significant (144 kcal [95% CI: 14; 274], p = 0.030). Conclusions: The FTO genotype is associated with a higher energy intake.

Asociación entre el polimorfismo rs9939609 del gen FTO y marcadores de adiposidad en población adulta chilena / Association between FTO (ns9939609) genotype and adiposity markers in Chilean adults

Background: Numerous studies have identified the role of Fat-mass-associated-gene (FTO) in the development of obesity. Aim: To investigate the association of FTO gene with adiposity markers in Chilean adults. Material and Methods: 409 participants were included in this cross-sectional study. The association between FTO (rs9939609) genotype and adiposity markers was determined using linear regression analyses. Adiposity markers included were: body weight, body mass index, fat mass, waist circumference, hip circumference and waist/hip ratio. Results: A fully adjusted model showed a significant association between FTO genotype and body weight (2.16 kg per each extra copy of the risk allele [95% confidence intervals (CI): 0.45 to 3.87], p = 0.014), body mass index (0.61 kg.m-2 [95% CI: 0.12 to 1.20], p = 0.050) and fat mass (1.14% [95% CI: 0.39 to 1.89], p = 0.010). The greater magnitude of association was found between the FTO gene and fat mass when the outcomes were standardized to z-score. Conclusions: This study confirms an association between the FTO gene and adiposity markers in Chilean adults, which is independent of major confounding factors.

Exenatide ameliorates hepatic steatosis and attenuates fat mass and FTO gene expression through PI3K signaling pathway in nonalcoholic fatty liver disease

Non-alcoholic fatty liver disease (NAFLD) is a common disease associated with metabolic syndrome and can lead to life-threatening complications like hepatic carcinoma and cirrhosis. Exenatide, a glucagon-like peptide-1 (GLP-1) receptor agonist antidiabetic drug, has the capacity to overcome insulin resistance and attenuate hepatic steatosis but the specific underlying mechanism is unclear. This study was designed to investigate the underlying molecular mechanisms of exenatide therapy on NAFLD. We used in vivo and in vitro techniques to investigate the protective effects of exenatide on fatty liver via fat mass and obesity associated gene (FTO) in a high-fat (HF) diet-induced NAFLD animal model and related cell culture model. Exenatide significantly decreased body weight, serum glucose, insulin, insulin resistance, serum free fatty acid, triglyceride, total cholesterol, low-density lipoprotein, aspartate aminotransferase, and alanine aminotransferase levels in HF-induced obese rabbits. Histological analysis showed that exenatide significantly reversed HF-induced lipid accumulation and inflammatory changes accompanied by decreased FTO mRNA and protein expression, which were abrogated by PI3K inhibitor LY294002. This study indicated that pharmacological interventions with GLP-1 may represent a promising therapeutic strategy for NAFLD.

Down-regulation of FTO in human gastric cancer and its effect on cell line MGC-803 function / 基础医学与临床

Objective To investigate the expression of FTO in gastric cancer tissues and the functional significance of FTO in MGC-803 cell line.Methods The FTO mRNA was detected by RT-qPCR in 54 cases of gastric cancer samples and their paired adjacent normal control tissues.The effect of FTO overexpression in MGC-803 on cell proliferation,cell migration and invasion were detected by CCK-8,wound heal and ranswell assays,respectively.Results The expression of FTO mRNA was significantly lower than that of adjacent tissues(P＜O.05).Furthermore,overexpression of FTO in MGC-803 cells inhibited cell proliferation,cell migration and invasion.Conclusions FTO is low expressed in gastric cancer tissues and inhibits gastric cancer cell line MGC-803 proliferation,migration and invasion.FTO is closely associated with the development of gastric cancer.