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Molecular and Cellular Biology, December 2001, p. 7933-7943, Vol. 21, No. 23
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.23.7933-7943.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Individual Somatic H1 Subtypes Are Dispensable for Mouse Development Even in Mice Lacking the H10 Replacement Subtype

Yuhong Fan, Allen Sirotkin, Robert G. Russell, Julianna Ayala, and Arthur I. Skoultchi*

Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York 10461

Received 22 June 2001/Returned for modification 10 August 2001/Accepted 10 September 2001

H1 linker histones are involved in facilitating the folding of chromatin into a 30-nm fiber. Mice contain eight H1 subtypes that differ in amino acid sequence and expression during development. Previous work showed that mice lacking H10, the most divergent subtype, develop normally. Examination of chromatin in H10-/- mice showed that other H1s, especially H1c, H1d, and H1e, compensate for the loss of H10 to maintain a normal H1-to-nucleosome stoichiometry, even in tissues that normally contain abundant amounts of H10 (A. M. Sirotkin et al., Proc. Natl. Acad. Sci. USA 92:6434-6438, 1995). To further investigate the in vivo role of individual mammalian H1s in development, we generated mice lacking H1c, H1d, or H1e by homologous recombination in mouse embryonic stem cells. Mice lacking any one of these H1 subtypes grew and reproduced normally and did not exhibit any obvious phenotype. To determine whether one of these H1s, in particular, was responsible for the compensation present in H10-/- mice, each of the three H1 knockout mouse lines was bred with H10 knockout mice to generate H1c/H10, H1d/H10, or H1e/H10 double-knockout mice. Each of these doubly H1-deficient mice also was fertile and exhibited no anatomic or histological abnormalities. Chromatin from the three double-knockout strains showed no significant change in the ratio of total H1 to nucleosomes. These results suggest that any individual H1 subtype is dispensable for mouse development and that loss of even two subtypes is tolerated if a normal H1-to-nucleosome stoichiometry is maintained. Multiple compound H1 knockouts will probably be needed to disrupt the compensation within this multigene family.

* Corresponding author. Mailing address: Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave., Bronx, NY 10461. Phone: (718) 430-2169 or 2168. Fax: (718) 430-8574. E-mail: skoultch{at}aecom.yu.edu.

Molecular and Cellular Biology, December 2001, p. 7933-7943, Vol. 21, No. 23
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.23.7933-7943.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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