title: [Cloning and characterization of a novel rat gene RSD-7 differentially expressed in testis].
abstract: OBJECTIVE
  To isolate and identify the differentially expressed genes in spermatogenesis for the understanding molecular mechanism of spermatogenesis.
  
  
  METHODS
  Screening of the cDNA library, Northern blot, expression and purification in E. coli with GST expression system, immunocytochemical staining of testis sections were used.
  
  
  RESULTS
  (1) A cDNA fragment designated as RSD-7 was isolated from rat testis cDNA library. It was 1,238 bp in length, coding a protein of 232 amino acids with the GenBank accession number AF315467. The encoding protein of RSD-7 cDNA had a Ubiquitin-like domain. (2) Northern blot indicated that RSD-7 was uniquely expressed in rat testis, and in the testis RSD-7 emerged on the 30th postnatal day and expressed until 120th postnatal day. (3) Expression and purification of RSD-7 protein in E. coli with GST expression system and were used to obtain anti-RSD-7 antibody. (4) Immunolocalization of RSD-7 in rat testis revealed that it is expressed only in Sertoli cells.
  
  
  CONCLUSIONS
  Transcription pattern of RSD-7 and localization of RSD-7 protein in testis have been made, which established the base for the functional study of RSD-7.
authors.affiliation: State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, CAMS, PUMC, Beijing 100005, China.
authors.forename: Xiao-dong
authors.initials: XD
authors.lastname: Zhang
authors.forename: Da-wei
authors.initials: DW
authors.lastname: Gou
authors.forename: Shi-ying
authors.initials: SY
authors.lastname: Miao
authors.forename: Jian-chao
authors.initials: JC
authors.lastname: Zhang
authors.forename: Shu-dong
authors.initials: SD
authors.lastname: Zong
authors.forename: Lin-fang
authors.initials: LF
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000096:biosynthesis / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins / Q000096:biosynthesis* / Q000235:genetics; D008297:Male; D008969:Molecular Sequence Data; D011817:Rabbits; D051381:Rats; D017208:Rats, Wistar; D012097:Repressor Proteins / Q000096:biosynthesis* / Q000235:genetics; D012708:Sertoli Cells / Q000378:metabolism; D013091:Spermatogenesis; D013737:Testis / Q000378:metabolism*; D014452:Ubiquitins / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D018076:DNA, Complementary; D029968:Escherichia coli Proteins; D012097:Repressor Proteins; C112239:Rsd protein, E coli; D014452:Ubiquitins