Seasonal brain regeneration and chromosome instability are linked to selection on DNA repair in Sorex araneus

Sorex araneus, the Eurasian common shrew, has seasonal brain size plasticity (Dehnel’s phenomenon) and abundant intraspecific chromosomal rearrangements, but genomic contributions to these traits remain unknown. We couple a chromosome-scale genome assembly with seasonal brain transcriptomes to discover relationships between molecular changes and both traits. Positively selected genes enriched the Fanconi anemia DNA repair pathway, which prevents the accumulation of chromosomal aberrations, and is likely involved in chromosomal rearrangements (FANCI, FAAP100). Genes involved in neurogenesis show either signatures of positive selection (PCDHA6), seasonal differential expression in the cortex and hippocampus (Notch signaling), or both (SOX9), suggesting a role for cellular proliferation in seasonal brain shrinkage and regrowth. Both positive selection and evolutionary upregulation in the shrew hypothalamus of VEGFA and SPHK2 indicate adaptations in hypothalamic metabolic homeostasis have e..., , # Data for \"Selection on DNA repair underlies seasonal brain regeneration and chromosome instability in Sorex araneus\"

Dataset DOI: [10.5061/dryad.8gtht770x](10.5061/dryad.8gtht770x)

## Description of the data and file structure

### Abstract

*Sorex araneus*, the Eurasian common shrew, has seasonal brain size plasticity (Dehnel’s phenomenon) and abundant intraspecific chromosomal rearrangements, but genomic contributions to these traits remain unknown. We couple a chromosome-scale genome assembly with seasonal brain transcriptomes to discover relationships between molecular changes and both traits. Positively selected genes enriched the Fanconi anemia DNA repair pathway, which prevents the accumulation of chromosomal aberrations, and is likely involved in chromosomal rearrangements (*FANCI*, *FAAP100*). Genes involved in neurogenesis show either signatures of positive selection (*PCDHA6*), seasonal differential expression in the cortex and hippocampus (Notch signaling), or both (*SOX...,