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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Cell Dev. Biol.</journal-id>
<journal-title>Frontiers in Cell and Developmental Biology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Cell Dev. Biol.</abbrev-journal-title>
<issn pub-type="epub">2296-634X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">1416081</article-id>
<article-id pub-id-type="doi">10.3389/fcell.2024.1416081</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Cell and Developmental Biology</subject>
<subj-group>
<subject>Editorial</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Editorial: In celebration of women in developmental epigenetics</article-title>
<alt-title alt-title-type="left-running-head">Mann et al.</alt-title>
<alt-title alt-title-type="right-running-head">
<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fcell.2024.1416081">10.3389/fcell.2024.1416081</ext-link>
</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Mann</surname>
<given-names>Mellissa R. W.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="corresp" rid="c001">&#x2a;</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1128760/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Suzuki</surname>
<given-names>Masako</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1095956/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Keller Valsecchi</surname>
<given-names>Claudia I.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<role content-type="https://credit.niso.org/contributor-roles/Writing - review &#x26; editing/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>Magee-Womens Research Institute</institution>, <institution>Department of Obstetrics</institution>, <institution>Gynecology and Reproductive Sciences</institution>, <institution>University of Pittsburgh School of Medicine</institution>, <addr-line>Pittsburgh</addr-line>, <addr-line>PA</addr-line>, <country>United States</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Department of Nutrition</institution>, <institution>Texas A&#x26;M University</institution>, <addr-line>College Station</addr-line>, <addr-line>TX</addr-line>, <country>United States</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Institute of Molecular Biology</institution>, <addr-line>Mainz</addr-line>, <country>Germany</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>
<bold>Edited and reviewed by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/40169/overview">Ionel Sandovici</ext-link>, University of Cambridge, United Kingdom</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Mellissa R. W. Mann, <email>mrm194@pitt.edu</email>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>27</day>
<month>05</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>12</volume>
<elocation-id>1416081</elocation-id>
<history>
<date date-type="received">
<day>11</day>
<month>04</month>
<year>2024</year>
</date>
<date date-type="accepted">
<day>22</day>
<month>04</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2024 Mann, Suzuki and Keller Valsecchi.</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Mann, Suzuki and Keller Valsecchi</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<related-article id="RA1" related-article-type="commentary-article" journal-id="Front. Cell Dev. Biol." xlink:href="https://www.frontiersin.org/researchtopic/42979" ext-link-type="uri">Editorial on the Research Topic <article-title>In celebration of women in developmental epigenetics</article-title> </related-article>
<kwd-group>
<kwd>epigenetics</kwd>
<kwd>development</kwd>
<kwd>women researchers</kwd>
<kwd>genomic imprinting</kwd>
<kwd>epigenetic programming</kwd>
<kwd>developmental exposures</kwd>
</kwd-group>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Developmental Epigenetics</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<p>According to the United Nations, only 33% of researchers worldwide are <ext-link ext-link-type="uri" xlink:href="https://unesdoc.unesco.org/ark:/48223/pf0000388805">women</ext-link>. This number drops dramatically as women move through the academic ranks. Each year, more women professors leave academia (6% assistant; 10% associate; 19% full, 2011&#x2013;2020, United States), and fewer women are promoted (associate, 7%; full, 12%) compared to men (<xref ref-type="bibr" rid="B17">Spoon et al., 2023</xref>). Similarly, in Europe, retention rates in STEM remain low, with only 19% of women at the senior level (&#x3d;full professor, <ext-link ext-link-type="uri" xlink:href="https://op.europa.eu/en/publication-detail/-/publication/67d5a207-4da1-11ec-91ac-01aa75ed71a1">2021</ext-link>). These figures are reflected in manuscript submissions, where only 4%&#x2013;22% of corresponding authors are women (Nature <xref ref-type="bibr" rid="B7">Editorial, 2024</xref>; <xref ref-type="bibr" rid="B4">Br&#xfc;ck, 2023</xref>; <xref ref-type="bibr" rid="B5">Cell Editorial Team, 2022</xref>). Further compounding the gender disparity in publishing, women at all levels (graduate students to faculty) are less likely to be credited with authorship than men (<xref ref-type="bibr" rid="B15">Ross et al., 2022</xref>). To counteract these trends, this Research Topic is dedicated to publishing manuscripts by women scientists as the first and/or corresponding authors.</p>
<p>Women scientists have made pioneering contributions to the field of epigenetics. Mary Lyon&#x2019;s discovery of <italic>X</italic>-chromosome inactivation provided fundamental insights into dosage compensation mechanisms in mammals. Nobel laureate Barbara McClintock&#x2019;s work, on transposons and epigenetic silencing challenged traditional genetic paradigms and emphasized dynamic gene regulation. Susan Clark&#x2019;s development of bisulfite mutagenesis techniques was the bedrock for the precision mapping of global DNA methylation. Sarah Elgin&#x2019;s pioneering research on heterochromatin structure and function in <italic>Drosophila</italic> was key to understanding position effect variegation. These women, and many others, stand as role models for women scientists. Here, we highlight the contributions of these articles as a celebration of women in developmental epigenetics.</p>
<sec id="s1">
<title>Genomic imprinting</title>
<p>Genomic imprinting is an epigenetic process that is dependent on the sex of the parent in which one parental allele is silenced, while the other parental copy is expressed (<xref ref-type="bibr" rid="B1">Barlow and Bartolomei, 2014</xref>). Genomic imprinting and its intersection with development have long been championed by women researchers, such as Denise Barlow, Marisa Bartolomei, Shirley Tilghman, and Anne Ferguson-Smith, who identified the first imprinted genes (<xref ref-type="bibr" rid="B2">Barlow et al., 1991</xref>; <xref ref-type="bibr" rid="B3">Bartolomei et al., 1991</xref>; <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1328806/full">Ferguson-Smith et al.</ext-link>, 1991). In this Research Topic, <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1328806/full">Weinberg-Shukron et al.</ext-link> reviewed the developmental regulation of the <italic>Dlk1</italic>-<italic>Dio3</italic> imprinted domain. The authors conclude with a discussion on &#x201c;how to build an imprinted domain.&#x201d; <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2024.1369751/full">Fang and colleagues</ext-link> also reviewed mechanisms of imprint regulation, assessing evidence for host defense mechanisms and endogenous retroviral elements in the establishment and maintenance of canonical and non-canonical imprints. <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1192789/full">Regmi et al.</ext-link> discovered that the <italic>Dnmt1</italic> P allele mutation reduced methylation levels throughout the mouse genome, except at gametic differentially methylated regions (DMRs). This protection did not extend to the corresponding secondary DMRs, suggesting that the maintenance mechanisms at gDMRs are different from those at non-imprinted sequences and secondary DMRs.</p>
</sec>
<sec id="s2">
<title>Epigenetic programming</title>
<p>Given the reliance of epigenetic modifications on metabolites (e.g., methyl groups), investigators have turned to analyses of the one-carbon cycle and nutrients to decipher their role in embryonic/fetal epigenetic programming and inheritance (<xref ref-type="bibr" rid="B6">Clare et al., 2019</xref>). Emma Whitelaw&#x2019;s pioneering work on the molecular regulation of the mouse Agouti locus exemplifies the interplay between nutrient sensitivity, environmental factors, transposable elements, and epigenetic regulation during development (<xref ref-type="bibr" rid="B13">Morgan et al., 1999</xref>). She coined the term metastable epialleles (MEs) to describe loci where DNA methylation status, and thus phenotype, varies between individuals (<xref ref-type="bibr" rid="B14">Rakyan et al., 2002</xref>). In this Research Topic, <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1212199/full">Sainty et al.</ext-link> reviewed the current knowledge on the early life environment, including maternal micronutrient availability, and disease risk later in life, with a specific focus on DNA methylation at MEs. Additionally, the authors describe the uniqueness of assessing DNA methylation in the placenta as a target tissue for studying MEs in mixed environmental exposures. <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1209928/full">Senner and co-authors</ext-link> investigated genome-wide DNA methylation in the placentas of mice with fetal growth restriction, using a hypomorphic mutation at the methionine synthase reductase gene, which encodes a key enzyme in one-carbon metabolism. Although regions with altered DNA methylation were identified in homozygous mutant placentas, including young endogenous retroviral elements with ectopic expression, a direct link between the methylome of mutant spermatozoa and that of mutant placentas was not found. Thus, the authors discounted DNA methylation as a mechanism for direct or multigenerational epigenetic inheritance of aberrant fetal growth. <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1155634/full">Ducreux and colleagues</ext-link> investigated the impact of commercial media and methionine supplementation on the embryonic transcriptome as a proxy for preimplantation epigenetic programming in human ART-produced embryos. Embryos cultured in Fericult (no amino acids) until day 2 had altered gene expression compared to those cultured in a Global medium, including downregulation of SETDB1, a lysine methyltransferase (H3K9me3). Further culture in Global until day 5 (Fericult-Global vs. Global-Global) minimized these transcriptional changes.</p>
<p>Epigenetic modifications are not limited to chromatin modifications. Non-coding RNAs (ncRNAs) also play a significant role in epigenetic regulation, including microRNAs, SINEUPs (natural antisense long ncRNAs that increase translation of partially overlapping mRNAs), telomerase RNAs, and promoter-associated long ncRNAs (<xref ref-type="bibr" rid="B10">Mattick and Makunin, 2006</xref>; <xref ref-type="bibr" rid="B8">Esteller, 2011</xref>). These ncRNAs interact with RNA-binding proteins to regulate gene expression, chromatin structure, and telomere length (<xref ref-type="bibr" rid="B18">Statello et al., 2020</xref>). In this Research Topic, <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1168072/full">Tokunaga and Imamura</ext-link> discussed the potential of analyzing ncRNAs to provide a new therapeutic approach to microcephaly, which is often associated with developmental disorders. Additionally, <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2024.1357576/full">Le Breton et al.</ext-link> summarized the current understanding of the role of transposable elements (TEs) in the aging brain and in neurological conditions. They encouraged the investigation of aberrant TE activities and resulting products as potential biomarkers for neurological disorders or biological age.</p>
</sec>
<sec id="s3">
<title>Developmental exposures</title>
<p>Given the malleability of epigenetic modifications to cellular signals, it is not surprising that they also respond to environmental exposures (<xref ref-type="bibr" rid="B16">Ryznar et al., 2021</xref>; <xref ref-type="bibr" rid="B12">Mo et al., 2022</xref>; <xref ref-type="bibr" rid="B19">Tando and Matsui, 2023</xref>). This is especially true during prenatal and perinatal development, with epigenetic perturbation contributing to long-term adverse health outcomes. Using <italic>C. elegans</italic> as a model system, Susan Gasser examined chromatin organization and Histone 3 lysine 9 methylation in relation to perinuclear anchoring to the nuclear scaffold, as well as changes in chromatin state, phenotypic plasticity, and developmental fate in response to environmental factors, such as overcrowding pheromones (<xref ref-type="bibr" rid="B11">Meister et al., 2011</xref>; <xref ref-type="bibr" rid="B9">Gonzalez-Sandoval et al., 2015</xref>). <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1148906/full">Lawless and colleagues</ext-link> reviewed the impact of prenatal cadmium exposure on epigenetic alterations in the placenta, fetus, child/offspring, and adult, including in germ cells, potentially contributing to adverse multigenerational effects. <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fcell.2023.1198148/full">Petroff and co-authors</ext-link> examined the effects of environmental toxicants on hydroxymethylation. Exposure to the plasticizer di (2-ethylhexyl) phthalate over a period from preconception to perinatal weaning in mice resulted in aberrant hydroxymethylation in male (blood and cortex) and female (blood) adults. Similar exposure to lead (Pb) altered hydroxymethylation only in the cortex of adult males. These findings emphasize the susceptibility of the developing male cortex to environmental toxicants.</p>
</sec>
<sec sec-type="conclusion" id="s4">
<title>Conclusion</title>
<p>This Research Topic serves as a flagship for all current and future women scientists and leads by example in making progress toward gender parity in publishing.</p>
</sec>
</body>
<back>
<sec id="s5">
<title>Author contributions</title>
<p>MM: Writing&#x2013;review and editing, Writing&#x2013;original draft. MS: Writing&#x2013;review and editing, Writing&#x2013;original draft. CKV: Writing&#x2013;review and editing, Writing&#x2013;original draft.</p>
</sec>
<sec sec-type="funding-information" id="s6">
<title>Funding</title>
<p>The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. The authors declare financial support was received for research, authorship, and/or publication for MRWM by NIH/NICHD grants, R01HD101574 and R01HD109347; MS by NIH/NLBHI R01HL145302 and NIDDK R01DK136989; and CIKV by Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)&#x2013;Individual Project Grant 513744403, Scientific Network Grant 531902894, GRK GenEvo 407023052, GRK 4R <italic>491145305</italic>, Forschungsinitiative Rheinland-Pfalz (ReALity) and institutional funding from IMB.</p>
</sec>
<sec sec-type="COI-statement" id="s7">
<title>Conflict of interest</title>
<p>The authors declare that the research and writing of this Editorial was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="disclaimer" id="s8">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
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