title: Molecular cloning and characterization of SRG-L, a novel mouse gene developmentally expressed in spermatogenic cells.
abstract: Full-length cDNA of a novel mouse gene upregulated in late stages of spermatogenic cells was cloned from mouse testis using overlapping RT-PCR and RACE. The mRNA of the gene was expressed mainly in diplotene/pachytene spermatocytes, round and elongating spermatids. We named this gene as SRG-L (Spermatogenesis Related Gene expressed in late stages of spermatogenic cells, GenBank Accession No. AY352586). The tissue-specific analysis showed a higher expression level in testis and spleen. The gene is mapped on chromosome 8q33.1 and contains 18 exons. The full-length of cDNA is 2,843 bp with an open reading frame (ORF) of 2,625 bp that encodes a 104 kDa protein (874 amino acids) with a putative transmembrane region. The bioinformatics analysis revealed that the SRG-L has two conserved regions, transglutaminase-like homologues domain and D-serine dehydratase domain, rich phosphorylation sites and methylation sites. The SRG-L protein was detected in diplotene/pachytene spermatocytes and spermatids by immunohistochemical staining and Western blot. The results suggest that SRG-L may play definite roles regulating differentiation of germ cells during spermatogenesis, particularly during meiosis and spermiogenesis.
authors.affiliation: Department of Cell Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Beijing, China.
authors.forename: Quanhong
authors.initials: Q
authors.lastname: Ma
authors.forename: Haikun
authors.initials: H
authors.lastname: Wang
authors.forename: Rui
authors.initials: R
authors.lastname: Guo
authors.forename: Huizhen
authors.initials: H
authors.lastname: Wang
authors.forename: Yehua
authors.initials: Y
authors.lastname: Ge
authors.forename: Jing
authors.initials: J
authors.lastname: Ma
authors.forename: Shepu
authors.initials: S
authors.lastname: Xue
authors.forename: Daishu
authors.initials: D
authors.lastname: Han
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002454:Cell Differentiation; D033481:Chromosomes, Mammalian / Q000235:genetics; D003001:Cloning, Molecular; D019295:Computational Biology; D018076:DNA, Complementary / Q000235:genetics; D005260:Female; D018507:Gene Expression Regulation, Developmental; D016678:Genome / Q000235:genetics; D008297:Male; D008565:Membrane Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D051379:Mice; D008969:Molecular Sequence Data; D013091:Spermatogenesis / Q000235:genetics*; D013094:Spermatozoa / Q000166:cytology* / Q000378:metabolism*
chemical_list: D018076:DNA, Complementary; D008565:Membrane Proteins; C488679:SRG-L protein, mouse