PMID: 8584244Oct 20, 1995Paper

A behavioral assessment of Ts65Dn mice: a putative Down syndrome model

Neuroscience Letters
R M EscorihuelaJesús Flórez

Abstract

Mice which are trisomic for only the human chromosome (Chr) 21-homologous segment of mouse Chr 16 (segmental trisomy), including a portion of the Down syndrome region of human Chr 21, have recently been developed. Since these segmentally trisomic mice, designated Ts(17(16))65Dn, survive to adulthood, they may represent a mouse model for the study of Down syndrome. A partial characterization of their behavioral phenotype was undertaken by evaluating the sensorimotor reflexes, exploration, locomotor activity, emotionality and spatial learning in 16 male Ts65Dn mice (TS) and 16 control (CO) littermates. No sensorimotor deficits appeared in TS compared to CO mice. By contrast, head-dipping behaviour in the hold board was increased in TS mice with respect to the CO group, showing a higher repetition rate of previously explored holes. Crossings in the open field and total arm entries in the plus maze were higher in TS than in the CO group during the dark phase of the light-dark (LD) cycle under red light, but not during the light phase of the LD cycle under white light. Entries into the open arms of the plus maze were increased overall in TS mice when compared to CO mice, but no differences were found in time spent in the open arms. ...Continue Reading

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Citations

Apr 30, 2005·Mammalian Genome : Official Journal of the International Mammalian Genome Society·Angela J VillarCharles J Epstein
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