title: The novel function of OCT4B isoform-265 in genotoxic stress.
abstract: OCT4 is a key transcription factor in maintaining the pluripotency and self-renewal of embryonic stem cells (ESCs). Human OCT4 gene can generate three mRNA isoforms (OCT4A, OCT4B, and OCT4B1) by alternative splicing and four protein isoforms (OCT4A, OCT4B-265, OCT4B-190, and OCT4B-164) by alternative splicing or alternative translation initiation. OCT4A is a transcription factor responsible for the stemness of ESCs, while the function of OCT4B protein isoforms is still not clear. We have previously reported that OCT4B-190 functioned in cell stress response. Here, we present another product of OCT4 gene, OCT4B-265, which is upregulated under genotoxic stress in stem cells, and it may function in stress response through p53 signaling pathway. This work gives an insight into the novel function of OCT4B protein isoforms and helps us to understand the complex expression patterns and biological functions of OCT4 gene.
authors.affiliation: State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, People's Republic of China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
authors.forename: Jianshu
authors.initials: J
authors.lastname: Wei
authors.forename: Jin
authors.initials: J
authors.lastname: Han
authors.forename: Xia
authors.initials: X
authors.lastname: Wang
authors.forename: Guannan
authors.initials: G
authors.lastname: Su
authors.forename: Yannan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Bing
authors.initials: B
authors.lastname: Chen
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Xiao
authors.forename: Jiani
authors.initials: J
authors.lastname: Cao
authors.forename: Jianwu
authors.initials: J
authors.lastname: Dai
mesh_terms: D000906:Antibodies / Q000276:immunology; D002460:Cell Line; D004249:DNA Damage; D005786:Gene Expression Regulation; D006801:Humans; D008970:Molecular Weight; D050814:Octamer Transcription Factor-3 / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D014176:Protein Biosynthesis / Q000235:genetics; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013234:Stem Cells / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D000906:Antibodies; D050814:Octamer Transcription Factor-3; C494173:POU5F1 protein, human; D020033:Protein Isoforms; D012333:RNA, Messenger; D016159:Tumor Suppressor Protein p53