Mutations in ErbB2 accumulating in the male germline measured by error-corrected sequencing
Yasari, A.; Heinzl, M.; Mair, T.; Karimian, T.; Moukbel, S. A.; Hartl, I.; Betancourt, A. J.; Lanzerstorfer, P.; Tiemann-Boege, I.
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Mutations in the male germline are a driving force behind rare genetic diseases. Driver mutations enjoying a selective advantage expand to mutant clusters within the aged testis and are thus overrepresented in sperm with age. Other kinds of driver mutations, occurring prepubescently, have been the focus of recent attention given their high occurrence rate independent of age. Here, we investigated the ErbB2 gene via error-corrected sequencing and detected a high percentage of missense mutations, including recurrent mutations, which were observed mainly in the tyrosine kinase domain with likely functional consequences, as we verified for a subset via biophysical methods. While these mutations increased with age, we found no evidence that they originated from mutational clusters in the aged testis, and young donors also showed an accumulation of driver mutations, suggesting that mutational enrichment is not exclusive to the sexually mature germline but can occur earlier during germline development, and are likely evenly distributed in the testis and stable in size.
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