This is very exciting and informative information, which is why I treat men too! As it turns out, while it is not the only contributor, sperm delivers the critical paternal genetic and epigenetic blueprints that predominantly drive the architectural building and specialized functions of the fetal placenta. [1 (https://pmc.ncbi.nlm.nih.gov/articles/PMC9716072/), 2 (https://belibaby.com/blogs/resources/it-starts-with-the-sperm-placental-development?srsltid=AfmBOoq6JF3l4fUnssAtaogY9LBV0tponAoJP9rKOiztXqCdjFuz92rZ)]
The Role of Paternal Genes
• Genetic dominance: Through a phenomenon called genomic imprinting, certain genes inherited from the father are “switched on” while the corresponding maternal genes are silenced. Studies highlight that these paternally expressed genes—such as the growth-promoting Igf2 gene—are the primary drivers of placental growth, determining how aggressively the placenta invades the uterus and extracts nutrients.[1 (https://www.cam.ac.uk/research/news/battle-of-the-sexes-begins-in-womb-as-father-and-mothers-genes-tussle-over-nutrition), 2 (https://www.vet.cornell.edu/about-us/news/20130812/dads-genes-build-placentas-study-shows), 3 (https://naturalwomanhood.org/dad-preconception-health/), 4 (https://belibaby.com/blogs/resources/it-starts-with-the-sperm-placental-development?srsltid=AfmBOoq6JF3l4fUnssAtaogY9LBV0tponAoJP9rKOiztXqCdjFuz92rZ), 5 (https://www.cam.ac.uk/research/news/battle-of-the-sexes-begins-in-womb-as-father-and-mothers-genes-tussle-over-nutrition)]
• Evolutionary balance: Researchers note an evolutionary “tug-of-war” in the womb. While paternal genes act to maximize the extraction of maternal resources for fetal growth, maternal genes in the placenta act to limit nutrient supply to prevent the fetus from becoming too large to safely carry and birth. [1 (https://www.cam.ac.uk/research/news/battle-of-the-sexes-begins-in-womb-as-father-and-mothers-genes-tussle-over-nutrition), 2 (https://www.cam.ac.uk/research/news/battle-of-the-sexes-begins-in-womb-as-father-and-mothers-genes-tussle-over-nutrition)]
• Research backing: Pioneering studies, including landmark research from Cornell University (https://news.cornell.edu/stories/2013/08/dad-s-genes-build-placentas-study-shows), confirm that paternally derived genes dictate the development of extra-embryonic tissues like the placenta, while maternal genes predominantly focus on programming the embryo proper. [1 (https://www.pnas.org/doi/10.1073/pnas.1308998110), 2 (https://www.jtgga.org/pdf/a5223c9c-50f0-490d-b293-6a74c2af8d3b/articles/12817/JTGGA-192-196.pdf), 3 (https://www.biorxiv.org/content/10.1101/2022.08.30.503982.full), 4 (https://news.cornell.edu/stories/2013/08/dad-s-genes-build-placentas-study-shows), 5 (https://belibaby.com/blogs/resources/it-starts-with-the-sperm-placental-development?srsltid=AfmBOoq6JF3l4fUnssAtaogY9LBV0tponAoJP9rKOiztXqCdjFuz92rZ)]
Why Sperm Health Matters
Because the sperm provides the foundational instructions for this temporary organ, its health before conception is crucial. If sperm DNA is oxidatively damaged or fragmented, it can lead to complications such as poor placental formation, intrauterine growth restriction, preeclampsia, or miscarriage. [1 (
), 2 (https://wenatal.com/blogs/wenatal/why-sperm-health-matters-and-how-to-boost-male-fertility?srsltid=AfmBOorDi9-_Ahjw7EkjKx-2CFMwB_7hawmPfLGlGlE3dcEuBMGGlnr1), 3 (https://kirstenmooring.com/sperm-health-and-pregnancy-outcomes-why-it-matters-more-than-you-think), 4 (https://belibaby.com/blogs/resources/it-starts-with-the-sperm-placental-development?srsltid=AfmBOoq6JF3l4fUnssAtaogY9LBV0tponAoJP9rKOiztXqCdjFuz92rZ)]
You can explore more about how paternal genes influence fetal development on the Proceedings of the National Academy of Sciences platform or dive into the broader biological implications reviewed by the National Institutes of Health (https://pmc.ncbi.nlm.nih.gov/articles/PMC9716072/). [1 (https://news.cornell.edu/stories/2013/08/dad-s-genes-build-placentas-study-shows)]
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Dr. Shasta Ericson DAOM
Holistic Fertility Doctor
It is quite striking that the placenta gets built mostly off paternally imprinted genes like Igf2.
That reframes the whole semen analysis conversation. A standard count and motility result tells you nothing about whether the DNA carrying those instructions is intact.
Do you find sperm DNA fragmentation testing actually shifts how the men in your practice treat the preconception window, or is it still a hard sell to test beyond the basic panel?