TY - JOUR
T1 - Utility of large consanguineous family-based model for investigating the genetics of type 2 diabetes mellitus
AU - Al-Sinani, Sawsan
AU - Hassan, Mohammed Othman
AU - Zadjali, Fahad
AU - Al-Yahyaee, Said
AU - Albarwani, Sulayma
AU - Rizvi, Syed
AU - Jaju, Deepali
AU - Comuzzie, Anthony
AU - Voruganti, Venkata Saroja
AU - Bayoumi, Riad
N1 - Funding Information:
This project was funded by The Research Council (TRC), Muscat, Oman ( RC/MED/BIOC/10/01 ).
PY - 2014/9/10
Y1 - 2014/9/10
N2 - Objectives: This study examined the utility of a family-based model for replicating the results of genome-wide association studies (GWAS) of type 2 diabetes (T2D). Methods and results: In a total of 232 members of a large consanguineous Omani Arab pedigree (age: 16-80. years), there were 27 diabetics and 50 prediabetics (17 with impaired fasting glucose and 33 with impaired glucose tolerance). All 232 individuals underwent anthropometric and biochemical investigations and genotyped for 14 known common gene variants of modest effect on T2D risk. Power analysis at a LOD score of 3, gave 80% power to locate a single specific locus that accounts for 52% of the total phenotypic variation. Measured genotype analysis (MGA) was used to determine heritability of various quantitative traits (QTs) which ranged 25-56%. Using MGA, some common gene variants were found to have little (< 5%) but significant impact on the heritability of T2D related QTs [. KCNJ11 (rs5219), p = 0.004]; [. IGF2BP2 (rs4402960), p = 0.02]; [. SLC30A8 (rs13266634), p = 0.05]; [. CAPN10 (rs2975760), p = 0.031]; [. FTO (rs8050136), p = 0.023]; [. FTO (rs9939609), p = 0.018] and [. SLC30A8 (rs13266634), p = 0.05]. Sib-TDT analysis showed that some gene variants were significantly associated with T2D risk but didn't reach the level of significance after Bonferroni correction [. KCNJ11 (rs5219), p = 0.047] and [. CAPN10 (rs41266971), p = 0.035]. Conclusion: We have demonstrated that, in principle, a family-based model with minor limitations could be used to replicate some of the results of large GWAS case-control studies. This model could successfully be applied for the future discovery, by deep sequencing, of rare gene variants.
AB - Objectives: This study examined the utility of a family-based model for replicating the results of genome-wide association studies (GWAS) of type 2 diabetes (T2D). Methods and results: In a total of 232 members of a large consanguineous Omani Arab pedigree (age: 16-80. years), there were 27 diabetics and 50 prediabetics (17 with impaired fasting glucose and 33 with impaired glucose tolerance). All 232 individuals underwent anthropometric and biochemical investigations and genotyped for 14 known common gene variants of modest effect on T2D risk. Power analysis at a LOD score of 3, gave 80% power to locate a single specific locus that accounts for 52% of the total phenotypic variation. Measured genotype analysis (MGA) was used to determine heritability of various quantitative traits (QTs) which ranged 25-56%. Using MGA, some common gene variants were found to have little (< 5%) but significant impact on the heritability of T2D related QTs [. KCNJ11 (rs5219), p = 0.004]; [. IGF2BP2 (rs4402960), p = 0.02]; [. SLC30A8 (rs13266634), p = 0.05]; [. CAPN10 (rs2975760), p = 0.031]; [. FTO (rs8050136), p = 0.023]; [. FTO (rs9939609), p = 0.018] and [. SLC30A8 (rs13266634), p = 0.05]. Sib-TDT analysis showed that some gene variants were significantly associated with T2D risk but didn't reach the level of significance after Bonferroni correction [. KCNJ11 (rs5219), p = 0.047] and [. CAPN10 (rs41266971), p = 0.035]. Conclusion: We have demonstrated that, in principle, a family-based model with minor limitations could be used to replicate some of the results of large GWAS case-control studies. This model could successfully be applied for the future discovery, by deep sequencing, of rare gene variants.
KW - Arab
KW - Family
KW - Genetics
KW - Oman
KW - Pedigree
KW - Type 2 diabetes
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U2 - 10.1016/j.gene.2014.06.053
DO - 10.1016/j.gene.2014.06.053
M3 - Article
C2 - 24993573
AN - SCOPUS:84907288635
SN - 0378-1119
VL - 548
SP - 22
EP - 28
JO - Gene
JF - Gene
IS - 1
ER -