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J. Med. Genet."],"published-print":{"date-parts":[[2002,4,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Comorbidity is pervasive among both adult and child psychiatric disorders; however, the etiological mechanisms underlying the majority of comorbidities are unknown. This study used genetic linkage analysis to assess the etiology of comorbidity between reading disability (RD) and attention\u2010deficit hyperactivity disorder (ADHD), two common childhood disorders that frequently co\u2010occur. Sibling pairs (<jats:italic>N<\/jats:italic>\u2009=\u200985) were ascertained initially because at least one individual in each pair exhibited a history of reading difficulties. Univariate linkage analyses in sibling pairs selected for ADHD from within this RD\u2010ascertained sample suggested that a quantitative trait locus (QTL) on chromosome 6p is a susceptibility locus for ADHD. Because this QTL is in the same region as a well\u2010replicated QTL for reading disability, subsequent bivariate analyses were conducted to test if this QTL contributed to comorbidity between the two disorders. Analyses of data from sib pairs selected for reading deficits revealed suggestive bivariate linkage for ADHD and three measures of reading difficulty, indicating that comorbidity between RD and ADHD may be due at least in part to pleiotropic effects of a QTL on chromosome 6p. \u00a9 2002 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajmg.10205","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T23:13:41Z","timestamp":1030317221000},"page":"260-268","source":"Crossref","is-referenced-by-count":111,"title":["Quantitative trait locus for reading disability on chromosome 6p is pleiotropic for attention\u2010deficit\/hyperactivity disorder"],"prefix":"10.1002","volume":"114","author":[{"given":"Erik G.","family":"Willcutt","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruce 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