Human sperm carry a hidden source of genetic diversity
Researchers from the Wellcome Sanger Institute and the University of Cambridge have discovered that genetic recombination in sperm begins earlier than previously thought. The study identifies non-crossover gene conversion during premeiotic cell division as a previously overlooked source of human genetic diversity.
Why it matters
Understanding the mechanisms of genetic diversity provides deeper insights into human biology, evolution, and the origins of genetic variation.
Genetic recombination in sperm can begin earlier than expected, revealing a previously overlooked source of human genetic diversity.
Every child inherits a genome that’s uniquely their own, shuffled together from both parents through a process called recombination.
Scientists have generally assumed most of that shuffling happens at one specific stage of sperm development. New research suggests they’ve been missing part of the picture entirely.
The study was led by researchers at the Wellcome Sanger Institute and the University of Cambridge .
The team found evidence that a type of genetic recombination called non-crossover gene conversion doesn’t only happen where scientists expected. A meaningful share of it happens earlier than anyone had traced before.
Recombination is the reason siblings don’t inherit identical DNA from their parents.
As sperm and eggs form, the two copies of each chromosome, one from each parent, exchange or copy segments of genetic material between each other.
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