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Kallestad L, Christensen K, Woods E, et al. Transcriptional repression is epigenetically marked by H3K9 methylation during SV40 replication. Clin Epigenetics. 2014;6(1):21doi: 10.1186/1868-7083-6-21.
Kallestad, L., Christensen, K., Woods, E., & Milavetz, B. (2014). Transcriptional repression is epigenetically marked by H3K9 methylation during SV40 replication. Clinical epigenetics, 6(1), 21. https://doi.org/10.1186/1868-7083-6-21
Kallestad, Les, et al. "Transcriptional repression is epigenetically marked by H3K9 methylation during SV40 replication." Clinical epigenetics vol. 6,1 (2014): 21. doi: https://doi.org/10.1186/1868-7083-6-21
Kallestad L, Christensen K, Woods E, Milavetz B. Transcriptional repression is epigenetically marked by H3K9 methylation during SV40 replication. Clin Epigenetics. 2014 Oct 27;6(1):21. doi: 10.1186/1868-7083-6-21. eCollection 2014. PMID: 25395994; PMCID: PMC4230732.
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Clin Epigenetics. 2014 Oct 27;6(1):21. doi: 10.1186/1868-7083-6-21. eCollection 2014.

Transcriptional repression is epigenetically marked by H3K9 methylation during SV40 replication.

Clinical epigenetics

Les Kallestad, Kendra Christensen, Emily Woods, Barry Milavetz

Affiliations

  1. Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, 501 N Columbia Road, Grand Forks, ND 58203 USA.

PMID: 25395994 PMCID: PMC4230732 DOI: 10.1186/1868-7083-6-21

Abstract

BACKGROUND: We have recently shown that T-antigen binding to Site I results in the replication-dependent introduction of H3K9me1 into SV40 chromatin late in infection. Since H3K9me2 and H3K9me3 are also present late in infection, we determined whether their presence was also related to the status of ongoing transcription and replication. Transcription was either inhibited with 5,6-dichloro-1-beta-D-ribofuranosylbenzimidizole (DRB) or stimulated with sodium butyrate and the effects on histone modifications early and late in infection determined. The role of DNA replication was determined by concomitant inhibition of replication with aphidicolin.

RESULTS: We observed that H3K9me2/me3 was specifically introduced when transcription was inhibited during active replication. The introduction of H3K9me2/me3 that occurred when transcription was inhibited was partially blocked when replication was also inhibited. The introduction of H3K9me2/me3 did not require the presence of H3K9me1 since similar results were obtained with the mutant cs1085 whose chromatin contains very little H3K9me1.

CONCLUSIONS: Our data suggest that methylation of H3K9 can occur either as a consequence of a specific repressive event such as T-antigen binding to Site I or as a result of a general repression of transcription in the presence of active replication. The results suggest that the nonproductive generation of transcription complexes as occurs following DRB treatment may be recognized by a 'proof reading' mechanism, which leads to the specific introduction of H3K9me2 and H3K9me3.

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