Transcription factors, cAMP-responsive element modulator (CREM) and Tisp40, act in concert in postmeiotic transcriptional regulation.
We previously isolated 80 TISP (transcript induced in spermiogenesis) genes whose transcription is dramatically induced during spermiogenesis. Our analysis here of the expression of these genes in the testis of the cAMP-responsive element modulator (CREM)-null mouse revealed that 54 TISP genes are under the transcriptional regulation of CREM. One CREM-regulated gene is TISP40, which encodes a basic leucine zipper (bZip)-type transcription factor bearing a transmembrane domain that generates the two proteins Tisp40alpha and Tisp40beta. Both of these proteins function by binding to UPRE (unfolded protein-response element) but do not recognize CRE motifs. We show here that Tisp40alpha mRNA is generated under the direct transcriptional regulation of CREM. CREMtau and Tisp40 form a heterodimer, which functions through CRE but not through UPRE. Furthermore, binding ability of CREM to CRE is dramatically up-regulated by forming a heterodimer with Tisp40alphaDeltaTM, a truncated form of Tisp40alpha that lacks the transmembrane domain. We confirmed that Tisp40 and CREM actually bind to the Tisp40 promoter in vivo by chromatin immunoprecipitation assay. Finally, we demonstrate that the Tisp40DeltaTM-CREMtau heterodimer acts as a recruiter of HIRA, a histone chaperone, to CRE. Taken together, we propose that Tisp40 is an important transcriptional regulator during spermiogenesis.
Nagamori
Ippei
I
Department of Molecular Genetics, Research Institute for Microbial Diseases, Osaka University, Yamadaoka 3-1, Suita City, Osaka 565-0871, Japan.
Yomogida
Kentaro
K
Adams
Peter D
PD
Sassone-Corsi
Paolo
P
Nojima
Hiroshi
H
D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D018797:Cell Cycle Proteins / Q000378:metabolism; D051786:Cyclic AMP Response Element Modulator / Q000737:chemistry / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D017362:Cyclic AMP Response Element-Binding Protein / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004247:DNA / Q000235:genetics / Q000378:metabolism; D019281:Dimerization; D006367:HeLa Cells; D056488:Histone Chaperones; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D013091:Spermatogenesis / Q000235:genetics*; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic; D014162:Transfection
D018797:Cell Cycle Proteins; C116472:Creb3 protein, mouse; C497411:Crem protein, mouse; D017362:Cyclic AMP Response Element-Binding Protein; C484187:Hira protein, mouse; D056488:Histone Chaperones; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; D051786:Cyclic AMP Response Element Modulator; D004247:DNA