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Related Experiment Videos

Isolation of cDNA clones encoding human histone macroH2A1 subtypes

Y Lee1, M Hong, J W Kim

  • 1Molecular and Cellular Biology Research Group, Korea Research Institute of Bioscience and Biotechnology, Taejon, South Korea.

Biochimica Et Biophysica Acta
|August 26, 1998
PubMed
Summary

Researchers isolated human histone macroH2A1.1 and macroH2A1.2 subtypes from liver tissue. These subtypes showed high similarity to rat counterparts and were expressed in all human tissues examined.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Histone variants play crucial roles in chromatin structure and function.
  • The macroH2A histone family, including macroH2A1, is implicated in gene regulation and cellular processes.
  • Understanding specific histone subtypes is essential for deciphering their distinct biological roles.

Purpose of the Study:

  • To isolate and characterize cDNA clones encoding human histone macroH2A1 subtypes.
  • To compare the human macroH2A1 subtypes with their rat counterparts.
  • To investigate the expression patterns of macroH2A1.1 and macroH2A1.2 in human tissues.

Main Methods:

  • Isolation of cDNA clones from human liver tissue.
  • Sequence analysis to determine protein and nucleotide features.

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  • Northern blot analysis to assess mRNA expression levels and sizes.

    • Main Results:

    • Two distinct human histone macroH2A1 subtypes, macroH2A1.1 and macroH2A1.2, were successfully isolated.
    • Predicted proteins were 368 and 371 amino acids, with molecular masses of 39.0 kDa and 39.4 kDa.
    • Human macroH2A1 subtypes exhibited ~98% sequence identity to rat counterparts and were expressed in all examined human tissues, with distinct mRNA sizes (1.5 kb for macroH2A1.1 and 4.4 kb for macroH2A1.2).

    Conclusions:

    • Human histone macroH2A1.1 and macroH2A1.2 are conserved across species with high sequence identity.
    • Both subtypes are ubiquitously expressed in human tissues, suggesting fundamental roles.
    • The distinct mRNA sizes indicate differential regulation or processing of these histone variants.