Sperm and egg cell. Fertilization concept. 3D rendered illustration.

Half the men in a Spanish study group displayed total sperm counts that were 57% lower post-Covid compared to their pre-Covid samples. (© vchalup - stock.adobe.com)

NEWCASTLE, United Kingdom — The causes of male infertility are still largely unclear, but a team of scientists at Newcastle University is close to cracking the code. Their latest research looked at genetic mechanisms during the reproduction process and found that mutations during the parental DNA replication process contributes to male infertility.

“At present, we don’t understand the underlying cause in the majority of infertile men, and this research will hopefully increase the percentage of men for whom we can provide answers,” says Joris Veltman, Dean of Newcastle’s Biosciences Institute, in a university release.

Understanding how male infertility occurs could help create targeted treatments to rectify the problem.

“If we are able to obtain a genetic diagnosis, then we can start understanding better male infertility problems and why some infertile men still produce sperm that can be used successfully for assisted reproduction,” Veltman explains.

Researchers began collecting DNA samples from 185 infertile men and their parents. They analyzed the samples for potential protein-altering mutations that potentially have a link to a male infertility phenotype.

Could men inherit infertility from their fathers?

In infertile men, the team found 29 of 145 rare mutations in genes that affect cellular mechanisms involved in reproductive processes such as sperm cell development.

Researchers detected one mutated gene in particular, RBM5, in several infertile men. Animal studies reveal RBM5 contributes to male infertility. An unmutated version of this gene also plays a role in pre-mRNA splicing in male germ cells. A follow-up study discovered that six mutations affecting this gene were present in 2,506 infertile patients.

Having mutations causes a dominant form of infertility leading to a 50-percent chance that men pass their infertility down to their sons.

“This is a real paradigm shift in our understanding of the causes of male infertility. Most genetic studies look at recessively inherited causes of infertility, whereby both parents are a carrier of a mutation in a gene, and the infertility occurs when the son receives both mutated copies, resulting in problems with their fertility,” Dr. Veltman says.

Researchers published their findings in the journal Nature Communications.

About Jocelyn Solis-Moreira

Jocelyn is a New York-based science journalist whose work has appeared in Discover Magazine, Health, and Live Science, among other publications. She holds a Master's of Science in Psychology with a concentration in behavioral neuroscience and a Bachelor's of Science in integrative neuroscience from Binghamton University. Jocelyn has reported on several medical and science topics ranging from coronavirus news to the latest findings in women's health.

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