4 ). In the extended and multigenerational Paisa pedigrees segregating ADHD comorbidly with ODD, CD, alcohol abuse/dependence, and nicotine dependence, we found that ADHD co-segregates with disruptive behaviors as a phenotypically variable trait, as evidenced by highly significant pair-wise linkages among ADHD and ODD (LOD = 14.19), ADHD and CD (LOD = 5.34), ODD and CD (LOD = 6.68), and CD and alcohol abuse/dependence (LOD = 3.98).
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A common genetic network underlies substance use disorders and disruptive or externalizing disorders.
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Another independent study utilized two-point linkage analysis in families with alcohol dependence to identify a nominally significant locus at D4S244 (Reich et al. 1998 ), which is ~5 Mb downstream of LPHN3 .