Quantitative-trait locus for specific language and reading deficits on chromosome 6p

Javier Gayán, Shelley D. Smith, Stacey S. Cherny, Lon R. Cardon, David W. Fulker, Amy M. Brower, Richard K. Olson, Bruce F. Pennington, John C. DeFries

Research output: Contribution to journalArticlepeer-review

228 Scopus citations


Reading disability (RD), or dyslexia, is a complex cognitive disorder manifested by difficulties in learning to read, in otherwise normal individuals. Individuals with RD manifest deficits in several reading and language skills. Previous research has suggested the existence of a quantitative-trait locus (QTL) for RD on the short arm of chromosome 6. In the present study, RD subjects' performance in several measures of word recognition and component skills of orthographic coding, phonological decoding, and phoneme awareness were individually subjected to QTL analysis, with a new sample of 126 sib pairs, by means of a multipoint mapping method and eight informative DNA markers on chromosome 6 (D6S461, D6S276, D6S105, D6S306, D6S258, D6S439, D6S291, and D6S1019). The results indicate significant linkage across a distance of at least 5 cM for deficits in orthographic (LOD = 3.10) and phonological (LOD = 2.42) skills, confirming previous findings.

Original languageEnglish (US)
Pages (from-to)157-164
Number of pages8
JournalAmerican Journal of Human Genetics
Issue number1
StatePublished - 1999

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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