JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Conserved expression of ubiquitin carboxyl-terminal esterase L1 (UCHL1) in mammalian testes.

Spermatogonia, the adult germ cells that initiate spermatogenesis in mammalian testis, are capable of dividing both mitotically and meiotically. Isolation and preservation of spermatogonia helps in preserving genetic pool of endangered animals. In this context, identification of marker(s) that can distinguish spermatogonia from other cells in testis gains significance. Here, we examined the expression of ubiquitin carboxyl-terminal esterase L1 (UCHL1) gene and protein in the testes of several mammals, including highly endangered species. Semi-quantitative-reverse transcriptase-polymerase chain reaction (RT-PCR) analysis showed presence of UCHL1 amplicon of 442 bp in all the 18 mammals studied. Nucleotide sequence analysis of these amplicons and their predicted protein sequences revealed 88-99% and 95-100% homology with available human UCHL1 and UCHL1 sequences of other available species in the GenBank, respectively. Western blot analysis showed that UCHL1 protein size was unique in all wild mammals. Immunohistology results confirmed UCHL1 expression in the spermatogonia/gonocytes in testes of several mammals belonging to eight distinct families including highly endangered Felidae, Canidae and Cercopithecoidae. These findings suggest that UCHL1 expression is conserved in the mammalian testis, and could be used as a specific marker for gonocytes/spermatogonia for developing male germ-cell based conservation techniques.

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