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Cell Rep. 2015 Nov 17;13(7):1310-1318. doi: 10.1016/j.celrep.2015.10.010. Epub 2015 Nov 5.

A Testis-Specific Chaperone and the Chromatin Remodeler ISWI Mediate Repackaging of the Paternal Genome.

Author information

1
Department of Biochemistry, Erasmus University Medical Center, P.O. Box 1738, 3000 DR, Rotterdam, the Netherlands.
2
Proteomics Centre, Erasmus University Medical Center, P.O. Box 1738, 3000 DR, Rotterdam, the Netherlands.
3
Department of Biochemistry, Erasmus University Medical Center, P.O. Box 1738, 3000 DR, Rotterdam, the Netherlands. Electronic address: c.verrijzer@erasmusmc.nl.

Abstract

During spermatogenesis, the paternal genome is repackaged into a non-nucleosomal, highly compacted chromatin structure. Bioinformatic analysis revealed that Drosophila sperm chromatin proteins are characterized by a motif related to the high-mobility group (HMG) box, which we termed male-specific transcript (MST)-HMG box. MST77F is a MST-HMG-box protein that forms an essential component of sperm chromatin. The deposition of MST77F onto the paternal genome requires the chaperone function of tNAP, a testis-specific NAP protein. MST77F, in turn, enables the stable incorporation of MST35Ba and MST35Bb into sperm chromatin. Following MST-HMG-box protein deposition, the ATP-dependent chromatin remodeler ISWI mediates the appropriate organization of sperm chromatin. Conversely, at fertilization, maternal ISWI targets the paternal genome and drives its repackaging into de-condensed nucleosomal chromatin. Failure of this transition in ISWI mutant embryos is followed by mitotic defects, aneuploidy, and haploid embryonic divisions. Thus, ISWI enables bi-directional transitions between two fundamentally different forms of chromatin.

PMID:
26549447
DOI:
10.1016/j.celrep.2015.10.010
[Indexed for MEDLINE]
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