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Proc Natl Acad Sci U S A
1986 May 01;8310:3351-5. doi: 10.1073/pnas.83.10.3351.
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Structure and developmentally regulated expression of a Strongylocentrotus purpuratus collagen gene.
Venkatesan M
,
de Pablo F
,
Vogeli G
,
Simpson RT
.
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We have isolated and partially characterized an ca. 20-kilobase-pair Strongylocentrotus purpuratus genomic clone, using a mouse alpha 1 (type IV) collagen cDNA probe. A 1-kilobase-pair HindIII fragment of the clone hybridizes strongly to the probe; this has been subcloned and sequenced. It contains 212 base pairs of sequence coding for (Gly-Xaa-Yaa)n (where Xaa and Yaa are different unspecified amino acids), characteristic of all known collagen genes. There is a single point of discontinuity within the repeating pattern in this exon, similar to the genomic structure of mouse type IV collagen. The (Gly-Xaa-Yaa)n-encoding element is flanked by consensus splicing sequences, and the intervening sequences on either side of it have multiple in-phase termination codons. Electron microscopy of R loops between the phage lambda recombinant clone and poly(A)+ RNA reveals multiple short exons, a feature also seen in vertebrate collagen genes. The (Gly-Xaa-Yaa)n protein-encoding sequence hybridizes to a developmentally regulated 9-kilobase mRNA; the message appears during the morula stage, rises sharply in abundance at the blastula stage, and decreases in proportion to total RNA later in development.
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