Impact of FTO genotypes on BMI and weight in polycystic ovary syndrome: A systematic review and meta-analysis

P. Wojciechowski, A. Lipowska, P. Rys, K. G. Ewens, S. Franks, S. Tan, E. Lerchbaum, J. Vcelak, R. Attaoua, M. Straczkowski, R. Azziz, T. M. Barber, A. Hinney, B. Obermayer-Pietsch, P. Lukasova, B. Bendlova, F. Grigorescu, I. Kowalska, M. O. Goodarzi, J. F. StraussM. I. McCarthy, M. T. Malecki

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Aims/hypothesis: FTO gene single nucleotide polymorphisms (SNPs) have been shown to be associated with obesity-related traits and type 2 diabetes. Several small studies have suggested a greater than expected effect of the FTO rs9939609 SNP on weight in polycystic ovary syndrome (PCOS). We therefore aimed to examine the impact of FTO genotype on BMI and weight in PCOS. Methods: A systematic search of medical databases (PubMed, EMBASE and Cochrane CENTRAL) was conducted up to the end of April 2011. Seven studies describing eight distinct PCOS cohorts were retrieved; seven were genotyped for SNP rs9939609 and one for SNP rs1421085. The per allele effect on BMI and body weight increase was calculated and subjected to meta-analysis. Results: A total of 2,548 women with PCOS were included in the study; 762 were TT homozygotes, 1,253 had an AT/CT genotype, and 533 were AA/CC homozygotes. Each additional copy of the effect allele (A/C) increased the BMI by a mean of 0.19 z score units (95% CI 0.13, 0.24; p∈=∈2.26∈×∈10-11) and body weight by a mean of 0.20 z score units (95% CI 0.14, 0.26; p∈=∈1. 02∈×∈10-10). This translated into an approximately 3.3 kg/m2 increase in BMI and an approximately 9.6 kg gain in body weight between TT and AA/CC homozygotes. The association between FTO genotypes and BMI was stronger in the cohorts with PCOS than in the general female populations from large genome-wide association studies. Deviation from an additive genetic model was observed in heavier populations. Conclusions/ interpretation: The effect of FTO SNPs on obesity-related traits in PCOS seems to be more than two times greater than the effect found in large population-based studies. This suggests an interaction between FTO and the metabolic context or polygenic background of PCOS.

Original languageEnglish (US)
Pages (from-to)2636-2645
Number of pages10
JournalDiabetologia
Volume55
Issue number10
DOIs
StatePublished - Oct 2012

Fingerprint

Polycystic Ovary Syndrome
Meta-Analysis
Genotype
Weights and Measures
Single Nucleotide Polymorphism
Homozygote
Body Weight
Obesity
Alleles
Population
Genome-Wide Association Study
Genetic Models
PubMed
Type 2 Diabetes Mellitus
Databases
Genes

Keywords

  • BMI
  • FTO
  • Meta-analysis
  • Polycystic ovary syndrome
  • Systematic review
  • Weight

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

Cite this

Wojciechowski, P., Lipowska, A., Rys, P., Ewens, K. G., Franks, S., Tan, S., ... Malecki, M. T. (2012). Impact of FTO genotypes on BMI and weight in polycystic ovary syndrome: A systematic review and meta-analysis. Diabetologia, 55(10), 2636-2645. https://doi.org/10.1007/s00125-012-2638-6

Impact of FTO genotypes on BMI and weight in polycystic ovary syndrome : A systematic review and meta-analysis. / Wojciechowski, P.; Lipowska, A.; Rys, P.; Ewens, K. G.; Franks, S.; Tan, S.; Lerchbaum, E.; Vcelak, J.; Attaoua, R.; Straczkowski, M.; Azziz, R.; Barber, T. M.; Hinney, A.; Obermayer-Pietsch, B.; Lukasova, P.; Bendlova, B.; Grigorescu, F.; Kowalska, I.; Goodarzi, M. O.; Strauss, J. F.; McCarthy, M. I.; Malecki, M. T.

In: Diabetologia, Vol. 55, No. 10, 10.2012, p. 2636-2645.

Research output: Contribution to journalArticle

Wojciechowski, P, Lipowska, A, Rys, P, Ewens, KG, Franks, S, Tan, S, Lerchbaum, E, Vcelak, J, Attaoua, R, Straczkowski, M, Azziz, R, Barber, TM, Hinney, A, Obermayer-Pietsch, B, Lukasova, P, Bendlova, B, Grigorescu, F, Kowalska, I, Goodarzi, MO, Strauss, JF, McCarthy, MI & Malecki, MT 2012, 'Impact of FTO genotypes on BMI and weight in polycystic ovary syndrome: A systematic review and meta-analysis', Diabetologia, vol. 55, no. 10, pp. 2636-2645. https://doi.org/10.1007/s00125-012-2638-6
Wojciechowski, P. ; Lipowska, A. ; Rys, P. ; Ewens, K. G. ; Franks, S. ; Tan, S. ; Lerchbaum, E. ; Vcelak, J. ; Attaoua, R. ; Straczkowski, M. ; Azziz, R. ; Barber, T. M. ; Hinney, A. ; Obermayer-Pietsch, B. ; Lukasova, P. ; Bendlova, B. ; Grigorescu, F. ; Kowalska, I. ; Goodarzi, M. O. ; Strauss, J. F. ; McCarthy, M. I. ; Malecki, M. T. / Impact of FTO genotypes on BMI and weight in polycystic ovary syndrome : A systematic review and meta-analysis. In: Diabetologia. 2012 ; Vol. 55, No. 10. pp. 2636-2645.
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T1 - Impact of FTO genotypes on BMI and weight in polycystic ovary syndrome

T2 - A systematic review and meta-analysis

AU - Wojciechowski, P.

AU - Lipowska, A.

AU - Rys, P.

AU - Ewens, K. G.

AU - Franks, S.

AU - Tan, S.

AU - Lerchbaum, E.

AU - Vcelak, J.

AU - Attaoua, R.

AU - Straczkowski, M.

AU - Azziz, R.

AU - Barber, T. M.

AU - Hinney, A.

AU - Obermayer-Pietsch, B.

AU - Lukasova, P.

AU - Bendlova, B.

AU - Grigorescu, F.

AU - Kowalska, I.

AU - Goodarzi, M. O.

AU - Strauss, J. F.

AU - McCarthy, M. I.

AU - Malecki, M. T.

PY - 2012/10

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N2 - Aims/hypothesis: FTO gene single nucleotide polymorphisms (SNPs) have been shown to be associated with obesity-related traits and type 2 diabetes. Several small studies have suggested a greater than expected effect of the FTO rs9939609 SNP on weight in polycystic ovary syndrome (PCOS). We therefore aimed to examine the impact of FTO genotype on BMI and weight in PCOS. Methods: A systematic search of medical databases (PubMed, EMBASE and Cochrane CENTRAL) was conducted up to the end of April 2011. Seven studies describing eight distinct PCOS cohorts were retrieved; seven were genotyped for SNP rs9939609 and one for SNP rs1421085. The per allele effect on BMI and body weight increase was calculated and subjected to meta-analysis. Results: A total of 2,548 women with PCOS were included in the study; 762 were TT homozygotes, 1,253 had an AT/CT genotype, and 533 were AA/CC homozygotes. Each additional copy of the effect allele (A/C) increased the BMI by a mean of 0.19 z score units (95% CI 0.13, 0.24; p∈=∈2.26∈×∈10-11) and body weight by a mean of 0.20 z score units (95% CI 0.14, 0.26; p∈=∈1. 02∈×∈10-10). This translated into an approximately 3.3 kg/m2 increase in BMI and an approximately 9.6 kg gain in body weight between TT and AA/CC homozygotes. The association between FTO genotypes and BMI was stronger in the cohorts with PCOS than in the general female populations from large genome-wide association studies. Deviation from an additive genetic model was observed in heavier populations. Conclusions/ interpretation: The effect of FTO SNPs on obesity-related traits in PCOS seems to be more than two times greater than the effect found in large population-based studies. This suggests an interaction between FTO and the metabolic context or polygenic background of PCOS.

AB - Aims/hypothesis: FTO gene single nucleotide polymorphisms (SNPs) have been shown to be associated with obesity-related traits and type 2 diabetes. Several small studies have suggested a greater than expected effect of the FTO rs9939609 SNP on weight in polycystic ovary syndrome (PCOS). We therefore aimed to examine the impact of FTO genotype on BMI and weight in PCOS. Methods: A systematic search of medical databases (PubMed, EMBASE and Cochrane CENTRAL) was conducted up to the end of April 2011. Seven studies describing eight distinct PCOS cohorts were retrieved; seven were genotyped for SNP rs9939609 and one for SNP rs1421085. The per allele effect on BMI and body weight increase was calculated and subjected to meta-analysis. Results: A total of 2,548 women with PCOS were included in the study; 762 were TT homozygotes, 1,253 had an AT/CT genotype, and 533 were AA/CC homozygotes. Each additional copy of the effect allele (A/C) increased the BMI by a mean of 0.19 z score units (95% CI 0.13, 0.24; p∈=∈2.26∈×∈10-11) and body weight by a mean of 0.20 z score units (95% CI 0.14, 0.26; p∈=∈1. 02∈×∈10-10). This translated into an approximately 3.3 kg/m2 increase in BMI and an approximately 9.6 kg gain in body weight between TT and AA/CC homozygotes. The association between FTO genotypes and BMI was stronger in the cohorts with PCOS than in the general female populations from large genome-wide association studies. Deviation from an additive genetic model was observed in heavier populations. Conclusions/ interpretation: The effect of FTO SNPs on obesity-related traits in PCOS seems to be more than two times greater than the effect found in large population-based studies. This suggests an interaction between FTO and the metabolic context or polygenic background of PCOS.

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KW - Meta-analysis

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KW - Systematic review

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