Genetic and clinical characteristics of Korean maturity-onset diabetes of the young (MODY) patients.
Maturity-onset diabetes of the young (MODY) is mostly caused by mutations of the hepatocyte nuclear factor (HNF)-1alpha (MODY3) and glucokinase (MODY2) genes in Caucasians. But most Japanese and Chinese MODY patients are not linked to known MODY genes. In this study, we examined the genetic and clinical characteristics of Korean subjects with MODY and early onset type 2 diabetes who had been diagnosed before 15 years of age. The study included 23 unrelated subjects fulfilling the criteria for MODY (three consecutive generations of type 2 diabetes with at least one member diagnosed under the age of 25 year) and 17 unrelated subjects diagnosed with early onset type 2 DM under the age of 15 years. The HNF-4alpha (MODY1), glucokinase (MODY2) and HNF-1alpha (MODY3) genes were analysed by direct sequencing. Mutations in the HNF-1alpha gene were found in two patients (5%). One of these, P393fsdelC, was novel, and was found in a patient classified in the MODY group. The GCK gene mutation, R191W, was identified in one patient classified as early-onset type 2 DM (2.5%). No mutations were found in the HNF-4alpha gene, except the T130I variant, which is a known rare polymorphism. In conclusion, the mutations in the HNF-1alpha gene and GCK account for a small proportion, about 5% and 2.5%, respectively, in Korean MODY and early onset type 2 patients. The majority of MODY cases in the Korean population are due to defects in unknown genes.
Hwang
Jin Soon
JS
Department of Pediatrics, Ajou University School of Medicine, Suwon, South Korea.
Shin
Choong Ho
CH
Yang
Sei Won
SW
Jung
Sung Young
SY
Huh
Nam
N
D000293:Adolescent; D001483:Base Sequence; D002681:China; D017931:DNA Primers; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics*; D005260:Female; D005941:Glucokinase / Q000235:genetics; D051538:Hepatocyte Nuclear Factor 1-alpha / Q000235:genetics; D051557:Hepatocyte Nuclear Factor 4 / Q000235:genetics; D006801:Humans; D007564:Japan; D007723:Korea; D008297:Male; D010375:Pedigree
D017931:DNA Primers; C496592:HNF4A protein, human; D051538:Hepatocyte Nuclear Factor 1-alpha; D051557:Hepatocyte Nuclear Factor 4; D005941:Glucokinase