Type 2 diabetes: evidence for linkage on chromosome 20 in 716 Finnish affected sib pairs. Academic Article uri icon

Overview

abstract

  • We are conducting a genome scan at an average resolution of 10 centimorgans (cM) for type 2 diabetes susceptibility genes in 716 affected sib pairs from 477 Finnish families. To date, our best evidence for linkage is on chromosome 20 with potentially separable peaks located on both the long and short arms. The unweighted multipoint maximum logarithm of odds score (MLS) was 3.08 on 20p (location, chi = 19.5 cM) under an additive model, whereas the weighted MLS was 2.06 on 20q (chi = 57 cM, recurrence risk,lambda(s) = 1. 25, P = 0.009). Weighted logarithm of odds scores of 2.00 (chi = 69.5 cM, P = 0.010) and 1.92 (chi = 18.5 cM, P = 0.013) were also observed. Ordered subset analyses based on sibships with extreme mean values of diabetes-related quantitative traits yielded sets of families who contributed disproportionately to the peaks. Two-hour glucose levels in offspring of diabetic individuals gave a MLS of 2. 12 (P = 0.0018) at 9.5 cM. Evidence from this and other studies suggests at least two diabetes-susceptibility genes on chromosome 20. We have also screened the gene for maturity-onset diabetes of the young 1, hepatic nuclear factor 4-a (HNF-4alpha) in 64 affected sibships with evidence for high chromosomal sharing at its location on chromosome 20q. We found no evidence that sequence changes in this gene accounted for the linkage results we observed.

authors

publication date

  • March 2, 1999

Research

keywords

  • Chromosomes, Human, Pair 20
  • Diabetes Mellitus, Type 2
  • Genetic Predisposition to Disease
  • Genetic Variation
  • Models, Genetic
  • Phosphoproteins
  • Transcription Factors

Identity

PubMed Central ID

  • PMC26760

Scopus Document Identifier

  • 13044277561

Digital Object Identifier (DOI)

  • 10.1073/pnas.96.5.2198

PubMed ID

  • 10051618

Additional Document Info

volume

  • 96

issue

  • 5