NDLI: Heterochromatin and histone modifications in the germline-restricted chromosome of the zebra finch undergoing elimination during spermatogenesis

Content Provider	Springer Nature Link
Author	Goday, Clara Pigozzi, María Inés
Copyright Year	2010
Abstract	In the zebra finch (Taeniopygia guttata) a germline-restricted chromosome (GRC) is regularly present in males and females. While the GRC is euchromatic in oocytes, in spermatocytes this chromosome is cytologically seen as entirely heterochromatic and presumably inactive. At the end of male meiosis, the GRC is eliminated from the nucleus. By immunofluorescence on microspreads, we investigated HP1 proteins and histone modifications throughout male meiotic prophase, as well as in young spermatid stages after the GRC elimination. We found that in prophase spermatocytes the GRC chromatin differs from that of the regular chromosome complement. The GRC is highly enriched in HP1β and exhibits high levels of di- and tri-methylated histone H3 at lysine 9 and tri- and di-methylated histone H4 at lysine 20. The GRC does not exhibit neither detectable levels of di- and tri-methylated histone H3 at lysine 4 nor acetylated histone H4 at lysine 5 and 8. The results prove the heterochromatic organization of the GRC in male germline and strongly suggest its transcriptional inactive state during male prophase. Following elimination, in young spermatids the GRC lacks HP1β signals but maintains high levels of methylated histone H3 at lysine 9 and methylated histone H4 at lysine 20. The release of HP1 from the GRC with respect to its elimination is discussed.
Starting Page	325
Ending Page	336
Page Count	12
File Format	PDF
ISSN	00095915
Journal	Chromosoma
Volume Number	119
Issue Number	3
e-ISSN	14320886
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Eukaryotic Microbiology Animal Genetics and Genomics Developmental Biology Human Genetics Biochemistry Cell Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Genetics (clinical)

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