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Volume 16, Number 9, Issue of May 1, 1996 pp. 3104-3111
Copyright ©1996 Society for Neuroscience

Mouse Model of Hyperkinesis Implicates SNAP-25 in Behavioral Regulation

Received Dec. 20, 1995; revised Feb. 1, 1996; accepted Feb. 9, 1996.

Ellen J. Hess1, Katherine A. Collins2, and Michael C. Wilson2

1 Department of Neuroscience and Anatomy, The Pennsylvania State University College of Medicine, Hershey Medical Center, Hershey, Pennsylvania 17033, and 2 Department of Neuropharmacology, The Scripps Research Institute, La Jolla, California 92037

Although hyperkinesis is expressed in several neurological disorders, the biological basis of this phenotype is unknown. The mouse mutant coloboma (Cm/+) exhibits profound spontaneous locomotor hyperactivity resulting from a deletion mutation. This deletion encompasses several genes including Snap, which encodes SNAP-25, a nerve terminal protein involved in neurotransmitter release. Administration of amphetamine, a drug that acts presynaptically, markedly reduced the locomotor activity in coloboma mice but increased the activity of control mice implicating presynaptic function in the behavioral abnormality. In contrast, the psychostimulant methylphenidate increased locomotor activity in both coloboma and control mice. When a transgene encoding SNAP-25 was bred into the coloboma strain to complement the Snap deletion, the hyperactivity expressed by these mice was rescued, returning these corrected mice to normal levels of locomotor activity. These results demonstrate that the hyperactivity exhibited by these mice is the result of abnormalities in presynaptic function specifically attributable to deficits in SNAP-25 expression.

Key words: hyperactivity; ADHD; locomotor activity; amphetamine; methylphenidate; transgenic; SNAP-25; mouse mutant; psychostimulant; coloboma




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