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Mol Cell Biol
1983 Jun 01;36:1021-31. doi: 10.1128/mcb.3.6.1021-1031.1983.
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Molecular cloning of five individual stage- and tissue-specific mRNA sequences from sea urchin pluteus embryos.
Fregien N
,
Dolecki GJ
,
Mandel M
,
Humphreys T
.
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Five developmentally regulated sea urchin mRNA sequences which increase in abundance between the blastula and pluteus stages of development were isolated by molecular cloning of cDNA. The regulated sequences all appeared in moderately abundant mRNA molecules of pluteus cells and represented 4% of the clones tested. There were no regulated sequences detected in the 40% of the clones which hybridized to the most abundant mRNA, and the screening procedures were inadequate to detect possible regulation in the 20 to 30% of the clones presumably derived from rare-class mRNA. The reaction of 32P[cDNA] from blastula and pluteus mRNA to dots of the cloned DNAs on nitrocellulose filters indicated that the mRNAs complementary to the different cloned pluteus-specific sequences were between 3- and 47-fold more prevalent at the pluteus stage than at the blastula stage. Polyadenylated RNA from different developmental stages was transferred from electrophoretic gels to nitrocellulose filters and reacted to the different cloned sequences. The regulated mRNAs were undetectable in the RNA of 3-h embryos, became evident at the hatching blastula stage, and reached a maximum in abundance by the gastrula or pluteus stage. Certain of the clones reacted to two sizes of mRNA which did not vary coordinately with development. Transfers of RNA isolated from each of the three cell layers of pluteus embryos that were reacted to the cloned sequences revealed that two of the sequences were found in the mRNA of all three layers, two were ectoderm specific, and one was endoderm specific. Four of the regulated sequences were complementary to one or two major bands and one to at least 50 bands on Southern transfers of restriction endonuclease-digested total sea urchin DNA.
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