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Mice develop normally without the H1(0) linker histone

A M Sirotkin¹, W Edelmann, G Cheng

¹Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

Proceedings of the National Academy of Sciences of the United States of America

|July 3, 1995

Summary

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The linker histone H1(0) is not essential for mouse development. Mice lacking H1(0) grew and reproduced normally, indicating its function is dispensable.

Area of Science:

Molecular Biology
Genetics
Cell Biology

Background:

Histone H1 subtypes, including H1(0), play roles in chromatin structure and cell differentiation.
H1(0) accumulates in terminally differentiating cells, suggesting a role in development.

Purpose of the Study:

To investigate the developmental role of the H1(0) histone by creating a knockout mouse model.
To determine if H1(0) deficiency impacts normal mouse growth, reproduction, or tissue histology.

Main Methods:

Gene disruption of the single-copy H1(0) gene in mouse embryonic stem cells using homologous recombination.
Analysis of H1(0)-deficient mice for anatomical, histological, and cellular abnormalities, including cell division patterns.
Chromatin analysis to assess the stoichiometry of other H1 subtypes and linker histones.

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Main Results:

Mice homozygous for the H1(0) mutation exhibited normal growth, reproduction, and no anatomical or histological abnormalities.
Tissues with normally high H1(0) expression showed no defects in cell division patterns in knockout mice.
Chromatin from H1(0)-deficient animals displayed normal proportions of other H1 subtypes, suggesting functional compensation.

Conclusions:

The function of the H1(0) linker histone is dispensable for normal mouse development.
Other H1 histone subtypes can compensate for the absence of H1(0), maintaining chromatin structure and function.