EMPIRICAL PAPERSMotor impairment: a new ethanol withdrawal phenotype in micePhilibin, Scott D.a b; Cameron, Andy J.a b; Metten, Pamelaa b; Crabbe, John C.a bAuthor Information aPortland Alcohol Research Center, VAMC Research bDepartment of Behavioral Neuroscience, Oregon Health & Science University, Oregon, USA Correspondence to Scott D. Philibin, PhD, Oregon Health & Science University, Department of Behavioral Neuroscience, 3181 SW Sam Jackson Park Rd L470, Portland, OR 97239–3098, USA E-mail: firstname.lastname@example.org Received 18 April 2008 Accepted as revised 23 June 2008 Behavioural Pharmacology: September 2008 - Volume 19 - Issue 5-6 - p 604-614 doi: 10.1097/FBP.0b013e32830ded27 Buy Metrics Abstract Alcoholism is a complex disorder with genetic and environmental risk factors. The presence of withdrawal symptoms is one criterion for alcohol dependence. Genetic animal models have followed a reductionist approach by quantifying various effects of ethanol withdrawal separately. Different ethanol withdrawal symptoms may have distinct genetic etiologies, and therefore differentiating distinct neurobiological mechanisms related to separate signs of withdrawal would increase our understanding of various aspects of the complex phenotype. This study establishes motor incoordination as a new phenotype of alcohol withdrawal in mice. Mice were made physically dependent on ethanol by exposure to ethanol vapor for 72 h. The effects of ethanol withdrawal in mice from different genetic backgrounds were measured on the accelerating rotarod, a simple motor task. Ethanol withdrawal disrupted accelerating rotarod behavior in mice. The disruptive effects of withdrawal suggest a performance rather than a learning deficit. Inbred strain comparisons suggest genetic differences in magnitude of this withdrawal phenotype. The withdrawal-induced deficits were not correlated with the selection response difference in handling convulsion severity in selectively bred Withdrawal Seizure-Prone and Withdrawal Seizure-Resistant lines. The accelerating rotarod seems to be a simple behavioral measure of ethanol withdrawal that is suitable for comparing genotypes. © 2008 Lippincott Williams & Wilkins, Inc.