Developmentally regulated expression of two novel platelet-derived growth factor alpha-receptor transcripts in human teratocarcinoma cells.
Two novel platelet-derived growth factor (PDGF) alpha-receptor transcripts of 1.5 kilobases and 5.0 kilobases are expressed in the human teratocarcinoma cell line Tera-2 only while the cells are in an undifferentiated state. After retinoic acid-induced differentiation, expression of these mRNAs is completely shut off and instead, the cells express a single 6.4-kilobase mRNA species which is also expressed in many other cell types. The 1.5-kilobase mRNA initiates within intron 12, contains the correctly spliced exons 13, 14, 15, and 16, and contains a cryptic exon, designated teratocarcinoma cryptic exon, at the 3' end. Teratocarcinoma cryptic exon contains a functional polyadenylation signal. Exons 13 to 16 correspond to the first tyrosine kinase domain and to part of the interkinase domain of the PDGF alpha-receptor. Recently, a splice variant lacking exon 14 was identified. These results show that a combination of alternative promoter usage and alternative splicing of the human PDGF alpha-receptor gene occur in a developmentally regulated fashion. In vitro translation of the 1.5-kilobase mRNA generates protein products which can be specifically immunoprecipitated with a PDGF alpha-receptor-specific antibody. The significance of the expression of this transcript for the growth factor-independent proliferation of undifferentiated Tera-2 cells is unclear. Expression of PDGF alpha-receptor transcripts containing the cryptic exon may be useful as a marker for undifferentiated stem cells in human teratocarcinomas.
Mosselman
S
S
Department of Cell Biology, University of Nijmegen, The Netherlands.
Claesson-Welsh
L
L
Kamphuis
J S
JS
van Zoelen
E J
EJ
D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D004273:DNA, Neoplasm / Q000032:analysis; D005091:Exons / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics; D017479:Receptors, Platelet-Derived Growth Factor / Q000032:analysis* / Q000235:genetics; D018243:Teratocarcinoma / Q000737:chemistry* / Q000473:pathology; D014407:Tumor Cells, Cultured
D004273:DNA, Neoplasm; D012333:RNA, Messenger; D017479:Receptors, Platelet-Derived Growth Factor