Journal Article

Histones associated with downregulated genes are hypo-acetylated in Huntington's disease models

Ghazaleh Sadri-Vakili, Bérengère Bouzou, Caroline L. Benn, Mee-Ohk Kim, Prianka Chawla, Ryan P. Overland, Kelly E. Glajch, Eva Xia, Zhihua Qiu, Steven M. Hersch, Timothy W. Clark, George J. Yohrling and Jang-Ho J. Cha

in Human Molecular Genetics

Volume 16, issue 11, pages 1293-1306
Published in print June 2007 | ISSN: 0964-6906
Published online April 2007 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddm078
Histones associated with downregulated genes are hypo-acetylated in Huntington's disease models

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Transcriptional dysregulation plays a major role in the pathology of Huntington's disease (HD). However, the mechanisms causing selective downregulation of genes remain unknown. Histones regulate chromatin structure and thereby control gene expression; recent studies have demonstrated a therapeutic role for histone deacetylase (HDAC) inhibitors in polyglutamine diseases. This study demonstrates that despite no change in overall acetylated histone levels, histone H3 is hypo-acetylated at promoters of downregulated genes in R6/2 mice, ST14a and STHdh cells, as demonstrated by in vivo chromatin immunoprecipitation. In addition, HDAC inhibitor treatment increases association of acetylated histones with downregulated genes and corrects mRNA abnormalities. In contrast, there is a decrease in mRNA levels in wild-type cells following treatment with a histone acetyltransferase inhibitor. Although changes in histone acetylation correlate with decreased gene expression, histone hypo-acetylation may be a late event, as no hypo-acetylation is observed in 4-week-old R6/2 mice. Nevertheless, treatment with HDAC inhibitors corrects mRNA abnormalities through modification of histone proteins and may prove to be of therapeutic value in HD.

Journal Article.  7678 words.  Illustrated.

Subjects: Genetics and Genomics

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