title: Cloning of a novel gene, Cymg1, related to family 2 cystatins and expressed at specific stages of mouse testis development.
abstract: We have cloned a novel gene, Cymg1 (GenBank accession number AY600990), from a mouse testis cDNA library. Cymg1 is located in 2G3 of mouse chromosome 2. The cDNA includes an open reading frame that encodes 141 amino acid residues. The encoded polypeptide has a cysteine protease inhibitor domain found in the family 2 cystatins but lacks critical consensus sites important for cysteine protease inhibition. These characteristics are seen in the proteins of the CRES subfamily of the family 2 cystatins which are expressed specifically in the reproductive tract. CYMG1 protein shows 44% identity with mouse CRES and 30% identity with mouse cystatin C. Northern blot analysis showed that the Cymg1 gene was specifically expressed in adult mouse testis. RT-PCR also showed that Cymg1 was expressed in testis and spermatogonial cells. Cymg1 expression level varied in the different developmental stages of mouse testis, and were coincidental with spermatogenesis and sex maturation. These results indicate that Cymg1 may play important roles in mouse spermatogenesis and sex maturation.
authors.affiliation: Human Reproductive and Stem Cell Engineering Institute, Central South University, Changsha 410078, People's Republic of China.
authors.forename: Y
authors.initials: Y
authors.lastname: Xiang
authors.forename: D S
authors.initials: DS
authors.lastname: Nie
authors.forename: G X
authors.initials: GX
authors.lastname: Lu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D003001:Cloning, Molecular; D055316:Cystatin C; D015891:Cystatins / Q000235:genetics*; D005091:Exons; D018507:Gene Expression Regulation, Developmental; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D012326:RNA Splicing; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012741:Sexual Maturation / Q000235:genetics; D013091:Spermatogenesis / Q000235:genetics; D013737:Testis / Q000254:growth & development*
chemical_list: C407209:Cst13 protein, mouse; C525031:Cst3 protein, mouse; D055316:Cystatin C; D015891:Cystatins