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The gracile axonal dystrophy (gad) mice are known to have a deletion within the gene encoding ubiquitin carboxy-terminal hydrolase-1 (Uch-L1) and show hereditary sensory deterioration and motor paresis. Expression of Uch-L1 is reported to be almost limited to the nervous system and testis. To understand whether Uch-L1, one of the major ubiquitin carboxy-terminal hydrolase (UCH) isozymes in the testis, affects spermatogenesis and other UCH isozymes (Uch-L3, L4 and L5) expression in the testis, we compared the testis between gad, hetero and wild type mice by histological, immunohistochemical analyses and RT-PCR. Histological analysis in 25-week-old gad mice showed shrinking of seminiferous tubules, decreasing total number of cells and enlargement of remaining cells in seminiferous tubules. By immunohistochemistry, a significant decrease (p &lt; 0.05) in the number of proliferating cell nuclear antigen (PCNA) positive cells was observed. Expression of other UCH isozyme mRNAs was not apparently affected by Uch-L1 deficiency in 25-week-old gad mice. This study is the first report on the testis of gad mutant mouse.

Characterization of the Testis in Congenitally Ubiquitin Carboxy-Terminal Hydrolase-1(Uch-L1) Defective(gad) Mice.