Telomere-to-telomere brown rat genome could sharpen disease research models
Researchers have created the most complete genetic profile of the brown rat to date, according to a UTHealth Houston-led team, paving the way for scientists to more accurately investigate genetic links to conditions like heart disease, kidney disease, high blood pressure and stroke.
Scientists have unveiled the most comprehensive genetic blueprint of the brown rat to date, a discovery that could significantly enhance research into genetic factors behind numerous health conditions. This groundbreaking achievement, led by a team from UTHealth Houston and published in Cell Genomics, has revealed the brown rat's DNA to be far more intricate than previously thought, containing more than 60 new genes.
One of the most striking findings is that brown rat sex chromosomes differ markedly from those in humans, with genes that facilitate chromosome pairing and replication absent from the X and Y chromosomes in rats. Instead, these genes have migrated to the regular chromosomes and altered their pairing sequences. This novel arrangement of the pseudoautosomal region could alter the way genetic research is conducted, providing a more accurate foundation for investigations into genetic links to diseases such as heart disease, kidney disease, high blood pressure, and stroke.
The complete genome sequence offers a detailed genetic fingerprint of the brown rat's 22 pairs of chromosomes, including their telomeres, and has been assembled using cutting-edge long-read methods. This comprehensive genome assembly, coupled with a pangenome that expands the genetic data by 7%, will enable scientists to better understand genetic variations among different brown rats and to pinpoint genetic variations linked to disease.
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