Study Shows Increased Functional DNA in Mitochondria Cures Male Infertility

Increased Functional DNA in Mitochondria Cures Male Infertility

Microscopy image of mouse testis. Credit: © MPI f. Biology of Ageing

In a mouse model, new research from the Max Planck Institute shows that a higher number of mitochondrial DNA molecules can compensate for the negative effects of mutations and decrease male infertility.

Male infertility can be caused by mutations in the DNA of mitochondria, the powerhouses of cells. By increasing the total DNA amount in mitochondria, scientists from the Max Planck Institute for Biology of Ageing in Cologne restored testis function and semen quality in infertile mice.

Worldwide approximately nine percent of women and men are involuntarily childless. In 40 to 50 percent of the cases, this is due to male infertility. This infertility can be caused by different reasons, one of them is mutations in the mitochondrial DNA. Mitochondria are tiny energy factories inside the cell and harbor their own independent genome – the mitochondrial DNA (mtDNA). Mice suffering from a high number of mutations in the mtDNA are infertile and have fewer and less motile sperm.

Max Planck scientist Min Jiang and her colleagues studied these mice and found a way to overcome the consequences of these mutations. ”We increased the total amount of mtDNA in the mitochondria of the testis. This did not change the proportion of mtDNA with mutations, but it increased the absolute number of non-mutated mtDNA, which restored mitochondrial energy production and semen quality,” explains Jiang.

As a next step the researchers want to screen for pharmaceuticals, which could stimulate total mtDNA amount in the testis. “We hope to find an efficient future strategy to treat or even cure patients suffering from infertility caused by mtDNA mutations,” says Jiang.

Reference: “Increased total mtDNA copy number cures male infertility despite unaltered mtDNA mutation load” by Min Jiang, Timo Eino Sakari Kauppila, Elisa Motori, Xinping Li, Ilian Atanassov, Kat Folz-Donahue, Nina Anna Bonekamp, Sara Albarran-Gutierrez, James Bruce Stewart and Nils-Göran Larsson, 1 August 2017, Cell Metabolism.
DOI: 10.1016/j.cmet.2017.07.003

Max Planck Institute

Recent Posts

Even Moderate Exercise Can Greatly Increase Brain Size

The effects are more pronounced in brain areas with high oxygen demand. Exercise keeps both…

October 4, 2022

Caltech’s Breakthrough New Nanophotonic Chip “Squeezes” More Out of Light

Electronic computing and communications have advanced significantly since the days of radio telegraphy and vacuum…

October 4, 2022

Parallels to HIV: Another Fatal Monkey Virus Could Be Poised for Spillover to Humans

Evoking parallels to HIV, authors are calling on global health community to be vigilant. According…

October 4, 2022

Scientists Show Transmission of Epigenetic Memory Across Multiple Generations

Changing the epigenetic marks on chromosomes results in altered gene expression in offspring and in…

October 4, 2022

Spectacular Planetary-Scale “Heat Wave” Discovered in Jupiter’s Atmosphere

An unexpected ‘heat wave’ has been discovered in Jupiter’s atmosphere. It reaches a scorching temperature…

October 4, 2022

“Really Impressive” – Astronomers Capture the First Wide-Field Snapshots of X-Ray Universe

EP-WXT Pathfinder has released its first results. EP-WXT Pathfinder, an experimental prototype of a module…

October 4, 2022