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In search for new markers of insulin-dependent diabetes (IDDM) susceptibility we studied the CATT tetranucleotide repeat in intron 1 of tyrosine hydroxylase (TH) gene on chromosome lip, the CA repeat at T-cell receptor a chain (TCRA) locus on chromosome 14q and two CA repeats at D10S211 and D10S213 loci in the chromosome 10 region containing glutamic acid decarboxylase (GAD2) gene. Alleles at these microsatellite loci were identified in a population of diabetic children and unrelated healthy controls originating from Wielkopolska, a midwestern region of Poland. We found significant association of certain alleles at TH, TCRA and D10S211 loci with diabetes in the population under study. On the contrary, none of the alleles at D10S213 locus was associated with the disease. Our findings indicate that typing of microsatellite markers may represent useful additional tool for identifying individuals at high risk of developing IDDM. Regarding loci on chromosome 10 our data and data published by other authors may suggest the extistence of two separate regions of association with IDDM susceptibility on this chromosome.
Extensive studies of the MC4R gene polymorphism showed that, among numerous variants, there are mutations responsible for monogenic obesity, as well as polymorphisms negatively correlated with the risk of obesity. In this report, we present the first studies of the whole coding sequence of the MC4R gene in 243 Polish obese children and adolescents (the mean relative body mass index [RBMI] was 163.6). In addition, 101 non-obese adults were also analyzed. Direct sequencing facilitated the identification of six missense (K73R, V103I, T112M, S127L, M215L, and I251L) and one silent (c.756 C > T) single-nucleotide polymorphisms (SNPs). Two non-synonymous polymorphisms (K73R and M215L) appeared to be novel and one was found in obese patients (M215L, one patient) and one in non-obese adults (K73R, one person). The overall frequency of non-synonymous variant carriers reached 4.1% and 6.9% in obese patients and non-obese adults, respectively. Only one obesity-associated variant (127L) was found in two obese patients (0.82%) and in two non-obese adults (1.98%). The obesity-protecting variants (103I and 251L) appeared to be the most common in both groups: 3.3% and 4.0%, respectively. It was also observed that the RBMI in obese children and adolescents carrying the minor variants did not differ significantly from the non-carriers; however, the expected trends for the associated and protecting variants were observed. We conclude that the contribution of the MC4R gene variants to the pathogenesis of obesity in Polish children and adolescents is low.
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