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Clare, CE, Pestinger, V, Kwong, WY, Tutt, DAR, Xu, J, Byrne, HM, Barrett, DA, Emes, RD 
ORCID: https://orcid.org/0000-0001-6855-5481 and Sinclair, KD,
2021.
Interspecific variation in one-carbon metabolism within the ovarian follicle, oocyte, and preimplantation embryo: consequences for epigenetic programming of dna methylation.
International Journal of Molecular Sciences, 22 (4): 1838.
ISSN 1661-6596
Abstract
One-carbon (1C) metabolism provides methyl groups for the synthesis and/or methylation of purines and pyrimidines, biogenic amines, proteins, and phospholipids. Our understanding of how 1C pathways operate, however, pertains mostly to the (rat) liver. Here we report that transcripts for all bar two genes (i.e., BHMT, MAT1A) encoding enzymes in the linked methionine-folate cycles are expressed in all cell types within the ovarian follicle, oocyte, and blastocyst in the cow, sheep, and pig; as well as in rat granulosa cells (GCs) and human KGN cells (a granulosa-like tumor cell line). Betaine-homocysteine methyltransferase (BHMT) protein was absent in bovine theca and GCs, as was activity of this enzyme in GCs. Mathematical modeling predicted that absence of this enzyme would lead to more volatile S-adenosylmethionine-mediated transmethylation in response to 1C substrate (e.g., methionine) or cofactor provision. We tested the sensitivity of bovine GCs to reduced methionine (from 50 to 10 µM) and observed a diminished flux of 1C units through the methionine cycle. We then used reduced-representation bisulfite sequencing to demonstrate that this reduction in methionine during bovine embryo culture leads to genome-wide alterations to DNA methylation in >1600 genes, including a cohort of imprinted genes linked to an abnormal fetal-overgrowth phenotype. Bovine ovarian and embryonic cells are acutely sensitive to methionine, but further experimentation is required to determine the significance of interspecific variation in BHMT expression.
| Item Type: | Journal article |
|---|---|
| Publication Title: | International Journal of Molecular Sciences |
| Creators: | Clare, C.E., Pestinger, V., Kwong, W.Y., Tutt, D.A.R., Xu, J., Byrne, H.M., Barrett, D.A., Emes, R.D. and Sinclair, K.D. |
| Publisher: | MDPI |
| Date: | 12 February 2021 |
| Volume: | 22 |
| Number: | 4 |
| ISSN: | 1661-6596 |
| Identifiers: | Number Type 10.3390/ijms22041838 DOI 1655379 Other |
| Rights: | This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
| Divisions: | Professional Services > The Directorate |
| Record created by: | Jonathan Gallacher |
| Date Added: | 08 Feb 2023 13:58 |
| Last Modified: | 08 Feb 2023 13:58 |
| URI: | https://irep.ntu.ac.uk/id/eprint/48200 |
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