title: Sperm associated antigen 8 (SPAG8), a novel regulator of activator of CREM in testis during spermatogenesis.
abstract: cAMP response element modulator (CREM)-mediated gene expression is an essential regulatory mechanism for germ cell differentiation. CREM and its coactivator in testis, ACT, activate the transcription of many essential genes for spermatogenesis. Sperm associated antigen 8 (SPAG8) is a testis-specific component that is expressed during germ cell differentiation. In this study, we found the pattern of SPAG8 expression largely overlapped with that of ACT during spermatogenesis and verified the association of SPAG8 with ACT. Furthermore, we showed that SPAG8 enhanced the transcriptional activation of ACT-mediated CREMtau by strengthening the binding of ACT to CREMtau. These results indicate that SPAG8 acts as a regulator of ACT and plays an important role in CREM-ACT-mediated gene transcription during spermatogenesis.
authors.affiliation: National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, Beijing, China.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Wu
authors.forename: Yingchun
authors.initials: Y
authors.lastname: Chen
authors.forename: Shiying
authors.initials: S
authors.lastname: Miao
authors.forename: Changyong
authors.initials: C
authors.lastname: Zhang
authors.forename: Shudong
authors.initials: S
authors.lastname: Zong
authors.forename: Samuel S
authors.initials: SS
authors.lastname: Koide
authors.forename: Linfang
authors.initials: L
authors.lastname: Wang
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000235:genetics / Q000378:metabolism*; D015153:Blotting, Western; D002460:Cell Line; D051786:Cyclic AMP Response Element Modulator / Q000235:genetics / Q000378:metabolism*; D005455:Fluorescent Antibody Technique; D006801:Humans; D047468:Immunoprecipitation; D060588:LIM Domain Proteins; D008297:Male; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D010766:Phosphorylation; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013091:Spermatogenesis / Q000235:genetics / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D000954:Antigens, Surface; C504656:FHL5 protein, human; C504657:Fhl5 protein, mouse; D060588:LIM Domain Proteins; D008565:Membrane Proteins; C099014:SPAG8 protein, human; D014157:Transcription Factors; C117930:activator of CREM in testis (ACT); D051786:Cyclic AMP Response Element Modulator