Molecular cloning and developmental expression of the caveolin gene family in the amphibian Xenopus laevis.
Caveolae are approximately 50-100 nm invaginations of the plasma membrane thought to form as a result of a local accumulation of cholesterol, sphingolipids, and a unique family of three proteins known as the caveolins: Cav-1, -2, and -3. Here, we report the identification, sequence, and developmental expression of the three caveolin genes in the amphibian Xenopus laevis. Sequence comparisons show that Xenopus Cav-1, -2, and -3 are approximately 80, 64, and 45% identical, respectively, to their counterparts in humans. Furthermore, Northern blotting experiments demonstrate that the Xenopus caveolins have tissue-specific expression profiles consistent with those previously reported in adult mammals. In the adult frog, Xenopus Cav-1 and Cav-2 are most abundantly expressed in the fat body and the lungs, while Xenopus Cav-3 is primarily expressed in muscle tissue types (heart and skeletal muscle). However, our temporal and spatial analyses of these expression patterns during embryogenesis reveal several novel features, with possible relevance to developmental signaling. Transcripts encoding Xenopus Cav-1 and -2 first appear in the notochord of neurula stage embryos, which represents a key signaling tissue. In contrast, Xenopus Cav-3 shows a highly specific punctate expression pattern in the embryonic epidermis, similar to previous patterns implicated in Notch signaling. These findings are in striking contrast to their steady-state expression patterns in the adult frog. Taken together, our results show that the Xenopus caveolin gene family is present and differentially expressed in both embryonic and adult tissues. This report is the first detailed study of caveolin gene expression in a developing embryo.
Razani
Babak
B
Department of Molecular Pharmacology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.
Park
David S
DS
Miyanaga
Yuko
Y
Ghatpande
Ashwini
A
Cohen
Justin
J
Wang
Xiao Bo
XB
Scherer
Philipp E
PE
Evans
Todd
T
Lisanti
Michael P
MP
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D051242:Caveolin 1; D051243:Caveolin 2; D051244:Caveolin 3; D022461:Caveolins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000302:isolation & purification; D004625:Embryo, Nonmammalian / Q000737:chemistry / Q000378:metabolism; D047108:Embryonic Development; D005260:Female; D018507:Gene Expression Regulation, Developmental; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D005810:Multigene Family; D009928:Organ Specificity / Q000235:genetics; D051381:Rats; D017386:Sequence Homology, Amino Acid; D029867:Xenopus Proteins; D014982:Xenopus laevis / Q000235:genetics* / Q000254:growth & development*
C495539:CAV1 protein, Xenopus; C495540:CAV1 protein, human; C495541:Cav1 protein, mouse; C495537:Cav1 protein, rat; C495548:Cav3 protein, mouse; C495549:Cav3 protein, rat; C495547:Cav3.1 protein, Xenopus; D051242:Caveolin 1; D051243:Caveolin 2; D051244:Caveolin 3; D022461:Caveolins; D018076:DNA, Complementary; D029867:Xenopus Proteins