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Evidence for linkage and association with reading disability on 6p21.3-22.
1Yale Child Health Research Center, Department of Pediatrics, Yale University School of Medicine, New Haven, CT 06520-8081, USA.
American Journal of Human Genetics
|April 16, 2002
Summary
Researchers identified a genetic region on chromosome 6p linked to reading disability (RD), or dyslexia. This quantitative trait locus (QTL) near marker JA04 shows significant association with reading and language phenotypes, particularly orthographic choice.
Area of Science:
- Genetics
- Neuroscience
- Psychology
Background:
- Reading disability (RD), or dyslexia, is a common neurodevelopmental disorder with a significant genetic basis.
- Previous studies have indicated a quantitative trait locus (QTL) for RD on chromosome 6p21.3-22.
Purpose of the Study:
- To further characterize the linkage to the 6p QTL.
- To refine the location and estimate the effect size of the RD-associated QTL.
- To identify a peak of genetic association within the candidate region.
Main Methods:
- Conducted Haseman-Elston and DeFries-Fulker linkage analyses.
- Performed transmission/disequilibrium, total-association, and variance-components analyses.
- Genotyped 104 families with RD using 29 markers across a 9 Mb region on chromosome 6p.
Main Results:
- Multipoint analysis suggested a linkage peak near marker D6S461.
- The average heritability for the 11 reading and language phenotypes was 0.27, with a maximum of 0.66 for orthographic choice.
- A significant peak of transmission disequilibrium and total association was observed at marker JA04 for orthographic choice.
Conclusions:
- The most likely location for the RD-associated QTL is within a 4-Mb region surrounding marker JA04.
- This study refines the location of a major genetic locus influencing reading and language abilities.
- The findings contribute to understanding the genetic architecture of dyslexia.