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Promoter conservation in HDACs points to functional implications.

Toni A Boltz1,2, Sawsan Khuri3, Stefan Wuchty4,5,6,7

  • 1Department of Computer Science, University of Miami, Coral Gables, FL, USA.

BMC Genomics
|July 29, 2019
PubMed
Summary

Evolutionary analysis of histone deacetylase (HDAC) gene promoters reveals conserved transcription factor binding sites (TFBSs) across species, suggesting functional relevance for HDAC regulation and expression patterns.

Keywords:
HDACPromoter analysisTFBSTissue specificity

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Histone deacetylases (HDACs) regulate gene expression by removing acetyl groups from histones.
  • Eleven HDACs are present in humans and vertebrates, with their basic functions understood but transcriptional regulation poorly characterized.

Purpose of the Study:

  • To computationally analyze HDAC promoter sequences across 25 vertebrate species.
  • To investigate the conservation of transcription factor binding sites (TFBSs) in HDAC evolution.
  • To explore potential HDAC expression patterns in human tissues based on TFBSs.

Main Methods:

  • Comparative genomic analysis of HDAC promoter sequences from 25 vertebrate species.
  • Identification and comparison of conserved transcription factor binding sites (TFBSs).
  • Correlation of TFBS profiles with known tissue-specific gene expression data for transcription factors.

Main Results:

  • HDAC promoter TFBS profiles showed significant conservation across related species, with exceptions for HDAC7 and HDAC10.
  • HDAC5 exhibited strong TFBS conservation across many species, particularly primates.
  • Most HDACs demonstrated potential for ubiquitous expression, with some showing tissue-specific preferences (e.g., HDAC11 in gallbladder, HDAC9 in non-nervous system).

Conclusions:

  • Evolutionary conservation of HDAC promoters is linked to ubiquitous HDAC expression.
  • Deviations from expected phylogenetic conservation of TFBSs suggest functional significance.
  • Functional differences in HDACs may stem from substrate specificity rather than solely location of activity.