Melanocortin-3 receptor gene variants in a Maori kindred with obesity and early onset type 2 diabetes

作者: Jencia Wong , Don R Love , Cam Kyle , Andre Daniels , Marie White

DOI: 10.1016/S0168-8227(02)00126-2

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摘要: Abstract Genetic studies suggest a diabetes susceptibility locus on human chromosome 20, near the melanocortin receptor-3 (MC3-R) gene. We examined MC3-R as candidate gene for type 2 in 12 members of large Maori kindred with multiple affected members. The coding region was sequenced both diabetic and non-diabetic individuals. Two separate single base pair substitutions were found sequence these resulted amino acid changes, Lysine6Threonine Isoleucine81Valine. Neither variants tracked presence diabetes. Furthermore, variant wild showed similar functional coupling to adenylyl cyclase. A polymorphic marker (D20S32e) close (hMC3-R) investigated 60-member pedigree association other metabolic parameters. There an between D20S32e genotype fasting insulin ( P =0.0085) resistance index, HOMA-R =0.0042). An also HDL levels during oral glucose tolerance testing =0.0037). These associations independent BMI, age, gender Our data do not support role variations hMC3-R development this kindred, but that 20q, D20S32e, may contribute secretion action kindred.

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