{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T01:11:48Z","timestamp":1769044308491,"version":"3.49.0"},"reference-count":212,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2024,8,31]],"date-time":"2024-08-31T00:00:00Z","timestamp":1725062400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biology"],"abstract":"<jats:p>The epigenetic phenomenon of genomic imprinting is puzzling. While epigenetic modifications in general are widely known in most species, genomic imprinting in the animal kingdom is restricted to autosomes of therian mammals, mainly eutherians, and to a lesser extent in marsupials. Imprinting causes monoallelic gene expression. It represents functional haploidy of certain alleles while bearing the evolutionary cost of diploidization, which is the need of a complex cellular architecture and the danger of producing aneuploid cells by mitotic and meiotic errors. The parent-of-origin gene expression has stressed many theories. Most prominent theories, such as the kinship (parental conflict) hypothesis for maternally versus paternally derived alleles, explain only partial aspects of imprinting. The implementation of single-cell transcriptome analyses and epigenetic research allowed detailed study of monoallelic expression in a spatial and temporal manner and demonstrated a broader but much more complex and differentiated picture of imprinting. In this review, we summarize all these aspects but argue that imprinting is a functional haploidy that not only allows a better gene dosage control of critical genes but also increased cellular diversity and plasticity. Furthermore, we propose that only the occurrence of allele-specific gene regulation mechanisms allows the appearance of evolutionary novelties such as the placenta and the evolutionary expansion of the eutherian brain.<\/jats:p>","DOI":"10.3390\/biology13090682","type":"journal-article","created":{"date-parts":[[2024,9,2]],"date-time":"2024-09-02T12:54:42Z","timestamp":1725281682000},"page":"682","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Imprinting as Basis for Complex Evolutionary Novelties in Eutherians"],"prefix":"10.3390","volume":"13","author":[{"given":"Maximillian","family":"Schuff","sequence":"first","affiliation":[{"name":"Next Fertility St. Gallen, K\u00fcrsteinerstrasse 2, 9015 St. Gallen, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amanda D.","family":"Strong","sequence":"additional","affiliation":[{"name":"Department of Anatomy, Howard University College of Medicine, 520 W St. NW, Washington, DC 20059, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lyvia K.","family":"Welborn","sequence":"additional","affiliation":[{"name":"Department of Anatomy, Howard University College of Medicine, 520 W St. NW, Washington, DC 20059, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1264-9240","authenticated-orcid":false,"given":"Janine M.","family":"Ziermann-Canabarro","sequence":"additional","affiliation":[{"name":"Department of Anatomy, Howard University College of Medicine, 520 W St. NW, Washington, DC 20059, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,8,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"548","DOI":"10.1038\/308548a0","article-title":"Development of reconstituted mouse eggs suggests imprinting of the genome during gametogenesis","volume":"308","author":"Surani","year":"1984","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Malnou, E.C., Umlauf, D., Mouysset, M., and Cavaille, J. 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