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. 1993 Feb;13(2):984–992. doi: 10.1128/mcb.13.2.984

Histone H2A.X gene transcription is regulated differently than transcription of other replication-linked histone genes.

W M Bonner 1, C Mannironi 1, A Orr 1, D R Pilch 1, C L Hatch 1
PMCID: PMC358983  PMID: 8423818

Abstract

Histone H2A.X is a replication-independent histone H2A isoprotein species that is encoded by a transcript alternatively processed at the 3' end to yield two mRNAs: a 0.6-kb mRNA ending with the stem-loop structure characteristic of the mRNAs for replication-linked histone species, and a second, polyadenylated 1.6-kb mRNA ending about 1 kb further downstream (C. Mannironi, W. M. Bonner, and C. L. Hatch, Nucleic Acids Res. 17:9113-9126, 1989). Of the two, the 0.6-kb H2A.X stem-loop mRNA predominates in many cell lines, indicating that the presence of two types of mRNA may not completely account for the replication independence of H2A.X protein synthesis. The ambiguity is resolved by the finding that the level of the 0.6-kb H2A.X mRNA is only weakly downregulated during the inhibition of DNA replication and only weakly upregulated during the inhibition of protein synthesis, while the levels of other replication-linked mRNAs are strongly down- or upregulated under these two conditions. Analysis of the nuclear transcription rates of specific H2A genes showed that while the rates of transcription of replication-linked H2A genes decreased substantially during the inhibition of DNA synthesis and increased substantially during the inhibition of protein synthesis, the rate of H2A.X gene transcription decreased slightly under both conditions. These differences in transcriptional regulation between the H2A.X gene and other replication-linked histone genes are sufficient to account for the differences in regulation of their respective stem-loop mRNAs.

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