# Mutation Hotspot Discovered at start of Human Genes
2025/12/05 05:24:54
A new study reports that the locations where genes begin are particularly prone to mutations, and these genetic changes can be inherited by later generations.
Researchers have identified previously overlooked areas of the human genome that are especially likely to accumulate mutations. These vulnerable sections of DNA can be inherited by future generations, making them highly relevant for understanding both genetics and disease.
these regions sit at the beginnings of genes, known as transcription start sites, where the cell begins converting DNA into RNA. According to a study released in Nature Communications, the first 100 base pairs after a gene’s starting point show a 35 percent higher chance of mutation than expected by random chance.
“These sequences are extremely prone to mutations and rank among the most functionally important regions in the entire human genome, together with protein-coding sequences,” explains Dr. Donate Weghorn, corresponding author of the study and researcher at the Center for Genomic Regulation in Barcelona.
The research also shows that many of these additional mutations emerge right after conception during the earliest rounds of cell division in the embryo. These alterations, called mosaic mutations, appear in only some cells rather than all of them, which has contributed to the difficulty of detecting this hotspot until now.
A parent may carry mosaic mutations that play a role in disease without ever showing symptoms, since the changes occur in only certain tissues. Despite this,the mutations can still be transmitted through egg or sperm cells. When that happens, the resulting child carries the mutation in every cell, which may lead to illness.
A Large-Scale survey of Human Genomes
To uncover this pattern, the research team examined transcription start sites in 150,000 genomes from the UK Biobank and another 75,000 from the Genome Aggregation Database (gnomAD).These findings were then compared with data from eleven family studies that included detailed facts about mosaic mutations.
Their analysis revealed that many gene start sites throughout the human genome carry