Heinz, Kathrin S. ; Rapp, Alexander ; Casas-Delucchi, Corella S. ; Lehmkuhl, Anne ; Romero-Fernández, Ismael ; Sánchez, Antonio ; Krämer, Oliver H. ; Marchal, J. Alberto ; Cardoso, M. Cristina (2019)
DNA replication dynamics of vole genome and its epigenetic regulation.
In: Epigenetics & chromatin, 12 (1)
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
BACKGROUND
The genome of some vole rodents exhibit large blocks of heterochromatin coupled to their sex chromosomes. The DNA composition and transcriptional activity of these heterochromatin blocks have been studied, but little is known about their DNA replication dynamics and epigenetic composition.
RESULTS
Here, we show prominent epigenetic marks of the heterochromatic blocks in the giant sex chromosomes of female Microtus cabrerae cells. While the X chromosomes are hypoacetylated and cytosine hypomethylated, they are either enriched for macroH2A and H3K27me3 typical for facultative heterochromatin or for H3K9me3 and HP1 beta typical for constitutive heterochromatin. Using pulse-chase replication labeling and time-lapse microscopy, we found that the heterochromatic block enriched for macroH2A/H3K27me3 of the X chromosome is replicated during mid-S-phase, prior to the heterochromatic block enriched for H3K9me3/HP1 beta, which is replicated during late S-phase. To test whether histone acetylation level regulates its replication dynamics, we induced either global hyperacetylation by pharmacological inhibition or by targeting a histone acetyltransferase to the heterochromatic region of the X chromosomes. Our data reveal that histone acetylation level affects DNA replication dynamics of the sex chromosomes' heterochromatin and leads to a global reduction in replication fork rate genome wide.
CONCLUSIONS
In conclusion, we mapped major epigenetic modifications controlling the structure of the sex chromosome-associated heterochromatin and demonstrated the occurrence of differences in the molecular mechanisms controlling the replication timing of the heterochromatic blocks at the sex chromosomes in female Microtus cabrerae cells. Furthermore, we highlighted a conserved role of histone acetylation level on replication dynamics across mammalian species.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Heinz, Kathrin S. ; Rapp, Alexander ; Casas-Delucchi, Corella S. ; Lehmkuhl, Anne ; Romero-Fernández, Ismael ; Sánchez, Antonio ; Krämer, Oliver H. ; Marchal, J. Alberto ; Cardoso, M. Cristina |
| Art des Eintrags: | Bibliographie |
| Titel: | DNA replication dynamics of vole genome and its epigenetic regulation. |
| Sprache: | Englisch |
| Publikationsjahr: | 14 März 2019 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Epigenetics & chromatin |
| Jahrgang/Volume einer Zeitschrift: | 12 |
| (Heft-)Nummer: | 1 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | BACKGROUND The genome of some vole rodents exhibit large blocks of heterochromatin coupled to their sex chromosomes. The DNA composition and transcriptional activity of these heterochromatin blocks have been studied, but little is known about their DNA replication dynamics and epigenetic composition. RESULTS Here, we show prominent epigenetic marks of the heterochromatic blocks in the giant sex chromosomes of female Microtus cabrerae cells. While the X chromosomes are hypoacetylated and cytosine hypomethylated, they are either enriched for macroH2A and H3K27me3 typical for facultative heterochromatin or for H3K9me3 and HP1 beta typical for constitutive heterochromatin. Using pulse-chase replication labeling and time-lapse microscopy, we found that the heterochromatic block enriched for macroH2A/H3K27me3 of the X chromosome is replicated during mid-S-phase, prior to the heterochromatic block enriched for H3K9me3/HP1 beta, which is replicated during late S-phase. To test whether histone acetylation level regulates its replication dynamics, we induced either global hyperacetylation by pharmacological inhibition or by targeting a histone acetyltransferase to the heterochromatic region of the X chromosomes. Our data reveal that histone acetylation level affects DNA replication dynamics of the sex chromosomes' heterochromatin and leads to a global reduction in replication fork rate genome wide. CONCLUSIONS In conclusion, we mapped major epigenetic modifications controlling the structure of the sex chromosome-associated heterochromatin and demonstrated the occurrence of differences in the molecular mechanisms controlling the replication timing of the heterochromatic blocks at the sex chromosomes in female Microtus cabrerae cells. Furthermore, we highlighted a conserved role of histone acetylation level on replication dynamics across mammalian species. |
| ID-Nummer: | pmid:30871586 |
| Fachbereich(e)/-gebiet(e): | 10 Fachbereich Biologie 10 Fachbereich Biologie > Cell Biology and Epigenetics |
| Hinterlegungsdatum: | 18 Mär 2019 13:08 |
| Letzte Änderung: | 03 Jul 2024 02:38 |
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| Suche nach Titel in: | TUfind oder in Google |
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DNA replication dynamics of vole genome and its epigenetic regulation. (deposited 21 Apr 2019 19:55)
- DNA replication dynamics of vole genome and its epigenetic regulation. (deposited 18 Mär 2019 13:08) [Gegenwärtig angezeigt]
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