Widespread recovery of methylation at gametic imprints in hypomethylated cells following rescue with DNMT3A2.

Sarah-Jayne Mackin, Avinash Thakur, Karla M O'Neill, Colum P Walsh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Imprinted loci are paradigms of epigenetic regulation and are associated with a number of genetic disorders in human. A key characteristic of the imprints is the presence of a gametic differentially methylated region (gDMR) which must be passaged through the germline to be reprogrammed. We examined the most complete current set of imprinted gDMRs in mouse embryonic stem cells (ESCs) lacking either DNMT1 (1KO) or a combination of DNMT3A and DNMT3B (3abKO) and found that loss of methylation (5mC) was approximately equivalent. 1KO cells rescued with a cDNA expressing DNMT1 could not restore methylation at the imprinted gDMRs, as has previously been shown. Surprisingly however, nearly all gDMRs were remethylated in 3abKO cells rescued with a DNMT3A2 expression construct. These results were confirmed using three different approaches. Transcriptional activity at the H19/Igf2 locus also tracked with the methylation pattern, confirming functional reprogramming. These results suggested 1) a vital role for DNMT3A/B in methylation maintenance at imprints 2) that loss of DNMT1 and DNMT3A/B had equivalent effects 3) that rescue with DNMT3A2 can restore imprints in this model system. This system offers a potentially useful model in which to further explore aspects of imprint reprogramming
LanguageEnglish
Title of host publicationUnknown Host Publication
Number of pages1
Publication statusAccepted/In press - 8 Aug 2016
EventComing of Age: The Legacy of Dolly at 20 - Roslin Institute, University of Edinburgh
Duration: 8 Aug 2016 → …

Conference

ConferenceComing of Age: The Legacy of Dolly at 20
Period8/08/16 → …

Fingerprint

Methylation
Inborn Genetic Diseases
Epigenomics
Complementary DNA
Maintenance

Keywords

  • Imprint
  • ESC
  • Methylation
  • Reprogramming

Cite this

Mackin, S-J., Thakur, A., O'Neill, K. M., & Walsh, C. P. (Accepted/In press). Widespread recovery of methylation at gametic imprints in hypomethylated cells following rescue with DNMT3A2. In Unknown Host Publication
Mackin, Sarah-Jayne ; Thakur, Avinash ; O'Neill, Karla M ; Walsh, Colum P. / Widespread recovery of methylation at gametic imprints in hypomethylated cells following rescue with DNMT3A2. Unknown Host Publication. 2016.
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Mackin, S-J, Thakur, A, O'Neill, KM & Walsh, CP 2016, Widespread recovery of methylation at gametic imprints in hypomethylated cells following rescue with DNMT3A2. in Unknown Host Publication. Coming of Age: The Legacy of Dolly at 20, 8/08/16.

Widespread recovery of methylation at gametic imprints in hypomethylated cells following rescue with DNMT3A2. / Mackin, Sarah-Jayne; Thakur, Avinash; O'Neill, Karla M; Walsh, Colum P.

Unknown Host Publication. 2016.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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