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Mol Cell Biol
1988 Oct 01;810:4425-32. doi: 10.1128/mcb.8.10.4425-4432.1988.
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Cloning and characterization of a core histone gene tandem repeat in Urechis caupo.
Ingham LD
,
Davis FC
.
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A Urechis caupo histone gene tandem repeat has been isolated from a 5.0-kilobase EcoRI genomic library in lambda gtWES.lambda B. Genomic reconstruction experiments indicate that the cloned sequence is repeated approximately 100 times per haploid genome. Unique restriction fragments from the cloned sequence hybridize with individual core histone genes from a histone gene tandem repeat of the sea urchin, Strongylocentrotus purpuratus. No hybridization is detected when restriction digests are probed with a sea urchin H1 histone gene. Hybrid selection and in vitro translation of embryo mRNAs demonstrate that the clone contains sequences complementary to all four core histones; however, no H1 histone is detected among the translation products. Based on a restriction site map of the clone and the subcloned sequences which hybridize to the histone mRNAs, the order of the core histone genes in the clone is shown to be H3 H2A H2B H4. S1 nuclease hybrid protection mapping is used to locate the coding regions and to determine the transcript lengths of the core histone mRNAs. The transcript lengths of H2A, H2B, H3, and H4 mRNAs are approximately 464, 438, 494, and 397 bases, respectively. The S1 nuclease mapping also demonstrates that H2A and H4 are transcribed from one DNA strand while H2B and H3 are transcribed from the other strand. In the tandem repeat, the genes are organized so that transcription of the H2A-H2B and H3-H4 gene pairs is divergent.
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