A recent research led by scientists at Newcastle University has identified a new genetic mechanism that can cause severe forms of male infertility. This breakthrough in understanding the underlying cause of male infertility offers hope of better treatment options for patients in the future.
The study, published in 'Nature Communications', showed that new mutations, not inherited from father or mother, played a major role in this medical condition.
Experts have found that mutations occurring during the reproduction process, when the DNA of both parents is replicated, can result in infertility in men later in life.
It is hoped that this new knowledge will help to provide more answers in the future about the cause and best treatment options available to infertile couples.
Professor Joris Veltman, Dean of Newcastle University's Biosciences Institute, UK, led the research which involved patients from Newcastle Fertility Centre and Radboud University Medical Centre in the Netherlands.
He said: "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."
"However, our research has found that mutations which occur when the DNA is replicated during reproduction in parents plays a significant role in the infertility in their sons," he said.
"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," he said.
Scientists collected and studied DNA from a global cohort of 185 infertile men and their parents. They identified 145 rare protein-altering mutations that are likely to negatively impact male fertility.
As many as 29 of the mutations affected genes directly involved in processes related to spermatogenesis -- the process of sperm cell development -- or other cellular processes related to reproduction.
Experts identified mutations in the gene RBM5 in multiple infertile men. Previous research carried out in mice had shown that this gene played a role in male infertility.
Importantly, these mutations mostly caused a dominant form of infertility, where only one mutated gene is required. As a consequence, there was a 50 per cent chance that infertility caused by these mutations would be passed on to the man's child (if assisted reproductive technologies were used) and this might result in infertility, particularly in sons.
Millions of children have already been born through assisted reproductive approaches as a result of infertility. This research indicated a significant proportion of these children might inherit infertility from their father.
Professor Veltman said: "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."
"With our information, and the research others are doing, we hope clinicians can improve counselling for couples and recommend what is the best course of action in order to conceive, either by proposing an appropriate medically-assisted procedure or in cases where none is suitable, provide appropriate alternatives," he said.
It was estimated that up to 7 per cent of men were affected by infertility and 50 per cent of fertility problems within a heterosexual couple were due to the man. In around half of male infertility cases, the cause remained unexplained.
( With inputs from ANI )
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