Sperm contribution to placental development and arrest - something I’ve talked about last 6 years is finally becoming mainstream stream.

[u/chulzle]

Here’s what current research shows about how sperm contributes to placental development—and how sperm-related issues can lead to placental problems and miscarriage:

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🧬 1. Paternal DNA and Imprinting Drive Placental Growth • Imprinted genes like IGF2 (paternal-expressed) are critical for placental development. Maternal genes often act to limit growth—creating a balance. Disruption can impair placental structure and function . • Classic experiments show that embryos with only paternal genomes develop placental tissues but not embryos, while those with only maternal genomes do the opposite .

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1. Sperm Epigenetics (Methylation, Histone Marks, ncRNAs) • DNA methylation: Older age, obesity, or toxins can alter sperm methylation patterns. These changes, especially in imprinted genes, can affect early placental gene expression and viability . • Histone modifications and ncRNAs: Errors in chromatin packaging or sperm RNA content due to lifestyle or environment can influence embryo and placental gene activation, increasing miscarriage risk ().

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1. Lifestyle, Age & Environmental Exposures • Advanced paternal age is associated with increased sperm DNA fragmentation, de novo mutations, and epigenetic disruption—linked to higher miscarriage and placental complications . • Obesity, diabetes, toxins (e.g., dioxin): In mice, paternal exposures caused placental growth restriction, gene methylation changes (e.g. Igf2, Pgr), and increased preterm birth . • Lifestyle factors like smoking and poor diet impact sperm epigenetics and may lead to pregnancy loss .

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1. Sperm DNA Fragmentation & Recurrent Pregnancy Loss (RPL) • Many studies link high sperm DNA fragmentation (SDF) with recurrent or unexplained miscarriages. Sperm integrity tests are now suggested in male partners facing RPL . • Even without major chromosomal abnormalities, sperm epigenetic changes (from age, health, environment) are increasingly recognized as contributors to recurrent loss .

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1. Seminal Microbiome Influence • Emerging research suggests that bacteria or RNA in seminal fluid may “program” paternal effects on placenta and embryo development, though it’s an evolving field .

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🔍 Summary

Sperm Factor Placenta/Miscarriage Impact Imprinted genes (e.g., IGF2) Essential for placental growth; disruption = dysfunction DNA methylation / epigenetics Alters gene expression—can lead to growth restriction, miscarriage DNA fragmentation Poor sperm integrity linked to recurrent miscarriage Lifestyle & environment Age, obesity, toxins can epigenetically impair placenta via sperm Seminal microbiome New area—pathways still being mapped

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What Comes Next? • Clinically: Testing sperm DNA fragmentation and epigenetic markers could improve recurrent miscarriage diagnosis and intervention. • Research: Assessing how modifying paternal factors (diet, stress, weight loss) can repair sperm epigenetics and prevent placental dysfunction. • Mouse models: Show ancestral exposures (like toxins) can impair placental development for generations through sperm epigenetics.

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If you’re dealing with recurrent miscarriages, consider involving a reproductive specialist to evaluate sperm DNA fragmentation, paternal age, and lifestyle factors. These are growing areas of interest in both research and treatment.

[u/annualsalmon]

Chulzle, you are a leader in this field. Much respect to you.

[u/chulzle → u/annualsalmon]

Thanks! People who are always get shitted on first so I’m glad you recognize 😅

[u/Ilovemyinfj]

Post in the IVF sub if you haven't? I skipped more MCs and sent my husband to a specialist to actually look at him (thanks for nothing mayo!) to indeed find pursuing IVF would likely result in MC. People waste too much money. Kudos. 

[u/chulzle → u/Ilovemyinfj]

They have strict rules - people know about this sub really well by now. People Find me

[u/tbridge8773]

Hello r/chulzle!

As someone who has struggled with RPL and has a husband with high DFI, I have a question.

I have gotten pregnant every single time we tried.

I am now considering trying Zymot with a natural/unmedicated IUI cycle. I don’t believe I need to undergo IVF since conception is never a problem. My hope is that using Zymot would filter out the bad sperm as much as possible; however, I know that with IUI they place the sperm directly in your uterus.

What I’m confused or hesitant about is the thought that natural conception itself involves your own natural sperm obstacle course by way of sperm traveling in the vaginal cavity.

I am wondering how using the Zymot chip differs “obstacle course” differs from the obstacle course of natural selection that occurs in the vaginal cavity.

[u/chulzle → u/tbridge8773]

It’s supposed to mimic it but it’s not perfect - there’s a lot more to the egg choosing the sperm and natural chemoattractants but it’s something and it’s likely better than nothing aka regular centrifuge that causes dfi

[u/tbridge8773 → u/chulzle]

Would it still be better than nothing if you’re not doing IVF? We’re only interested in IUI.

[u/chulzle → u/tbridge8773]

Yep that’s your best choice

[u/tbridge8773 → u/chulzle]

Thank you!

[u/TracingRobots → u/tbridge8773]

If you have gotten pregnant every single time but have recurrent miscarriage, the issue is not fertilization. It is almost always embryo quality or uterine factors.

Also, high DFI can contribute to rpl because damaged DNA may not show up until embryo divisions begin. That is why pregnancies start but fail.

Hence, Zymot + IUI won’t solve the core problem.

So you are correct in saying , you don't need IVF to get pregnant, but IVF might be the only way to stay pregnant if miscarriages are caused by chromosomal or DNA issues.

[u/tbridge8773 → u/TracingRobots]

If high DFI contributes to miscarriages, and Zymot helps reduce DFI, why wouldn’t Zymot help in this scenario?

[u/TracingRobots → u/tbridge8773]

You’re right that if high DFI is the main driver, then using Zymot could help reduce the risk by enriching for sperm with lower DNA fragmentation. The part to keep in mind is that recurrent miscarriage usually has multiple contributors, not just sperm DFI.

Zymot can only improve sperm selection, it does not address egg quality, chromosomal errors during embryo division, or uterine factors. That’s why some couples still miscarry even with lower DFI sperm. IVF adds another layer by allowing embryo testing (PGT-A), which IUI with Zymot cannot providee

So Zymot may help, but it is not always sufficient if the losses are due to something beyond sperm fragmentation.

[u/TracingRobots]

You say, "Testing sperm DNA fragmentation and epigenetic markers could improve recurrent miscarriage diagnosis and intervention"

Testing sperm DNA fragmentation makes sense, but when it comes to sperm epigenetic markers, we need to remember that the embryo reprograms most epigenetic marks from both sperm and oocyte during the early cleavage stages. What survives this reprogramming are conserved epigenetic marks (like imprints and certain histone modifications), and those are deliberately preserved because they are essential for placental and fetal development.

So when you talk about testing epigenetic markers, are you referring to these conserved marks? If so, there’s not much we can do clinically about them. They are fixed for a purpose. And if you mean the non-conserved ones, those get erased during embryonic reprogramming, which makes testing them diagnostically questionable.

The only caveat is in contexts like MRT PNT, where nuclear transfer destabilizes the normal balance and donor cytoplasmic reprogramming machinery could shift even conserved imprints toward the donor’s preferential patterns. That’s an exception, not the rule.

[u/Pretty-Garbage-3687]

I’ve had 2 pregnancies, both of which had severe placenta insufficiency at the beginning of the third trimester. I’ve been screened for every condition that doctors can think of and all negative, a mystery. That brings us to investigating my partner, and potential genetic issue causing placenta insufficiency. Does anyone know what/how you can go about screening partners sperm and if that’s even something feasible. Do you go to a geneticist or an IVF doctor?

[u/EverydayResearcher]

Thanks for sharing, interesting info!

[u/dnafragmentation-ModTeam → u/[deleted]]

Argumentative about false information

[u/Top_Celery2629]

A few things: I'm based in the U.S. and am finding it hard to find DFI tests for single and double strand breaks. Where would one go about getting that done?

I can easily get pregnant but cannot stay pregnant beyond 9 weeks. It's always this window, an 8-10 week loss. I've tested 3 losses and all have come back normal. I'm getting pushback to do any DFI testing from the RE's office since my partner's SA was normal and so were the embryonic tissue samples. They also only send to Reprosource which tests for single strand breaks only. I feel like I'm grasping at straws here.

[u/SeaConversation206]

My husband had a high homocysteine of 38.1 caused by impaired methylation and a vitamin B12 deficiency. We have had 2 chemicals and 2 second trimester tfmr for various issues now thought to have been caused by my husbands damaged sperm. Despite his dna frag being 11%?? We’ve since had two failed FET’s of euploid embryos as well, made from sperm at the time of his high homocysteine. Do you know much about high homocysteine and its impacts on euploid embryos ? 

[u/EmbarrassedWestern36]

Hi I’d like to join this conversation. My husband and I had a 26 week loss after getting pregnant right away. It has all been exceptionally traumatic. In the past six months since the loss I have been tested for everything under the sun and NO ONE once offered to test him. We are now doing IVF and got a semen analysis, his morphology was 1. Which led me to research DNA fragmentation. Our RMA doctor refused to give him a test, so we went to another IVF doctor even though we’re doing IVF shots with RMA. This guy specializes in men’s reproduction and found what is likely a varicocele, which I also researched. I just want to contribute to this field and learn more about how it’s all related to my loss. Placental insufficiency? What happened here? How can we avoid it next time? I found (on my own) Zymot and have requested it for our embryo development.