Refinement of the 6p21.3 quantitative trait locus influencing dyslexia: linkage and association analyses

被引:123
作者
Deffenbacher, KE
Kenyon, JB
Hoover, DM
Olson, RK
Pennington, BF
DeFries, JC
Smith, SD
机构
[1] Univ Nebraska, Med Ctr, Munroe Meyer Inst, Ctr Human Mol Genet, Omaha, NE 68198 USA
[2] Univ Denver, Denver, CO USA
[3] Univ Colorado, Inst Behav Genet, Boulder, CO 80309 USA
关键词
D O I
10.1007/s00439-004-1126-6
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Reading disability (RD), or dyslexia, is the most common learning disability with a prevalence rate of similar to5%-10% in school-age children. RD is highly heritable with evidence of a neurobiological origin. Linkage studies have identified several quantitative trait loci (QTLs) for RD. The QTL on chromosome 6p21.3 has been independently replicated by several groups and spans a 16.4-Mb (13.8 cM) interval from D6S109 to D6S291. In this study, we performed sib-pair linkage analyses with Haseman-Elston and DeFries-Fulker methods to define more accurately the QTL interval. Linkage was assessed by using five quantitative phenotypes, including a composite measure of reading performance and four component phenotypes. When probands were selected for severe scores, single- and multi-point analyses showed significant linkage with all five phenotypes, converging over an interval of similar to3.24 Mb spanning D6S1597 to D6S1571. Maximal linkage converged at marker D6S1554 across phenotypes. Out of 12 genes in the linkage interval, ten clustered within similar to680 kb and were selected for association analysis based on central nervous system expression and putative function. Marker-trait associations were assessed by using QTDT (a general test of association for quantitative traits) and the family-based association test (FBAT), and haplotype analysis was performed by using FBAT and the GeneHunter Transmission/Disequilibrium Test TDT. Marker associations were detected in five of the ten genes, results that were corroborated by our haplotype TDT analysis. The results of the association study have thereby allowed us to significantly reduce the number of possible candidate genes and to prioritize genes for further mutation screening.
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页码:128 / 138
页数:11
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