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• W2770668845 abstract "Kallikrein related peptidase 8 (KLK8; also called neuropsin) is a serine protease that plays distinct roles in the skin and hippocampus. In the skin, KLK8 influences keratinocyte proliferation and desquamation, and activates antimicrobial peptides in sweat. In the hippocampus, KLK8 affects memory acquisition. Here, we examined the evolution of KLK8 in mammals and discovered that, out of 70 placental mammals, KLK8 is exclusively lost in three independent fully-aquatic lineages, comprising dolphin, killer whale, minke whale, and manatee. In addition, while the sperm whale has an intact KLK8 reading frame, the gene evolves neutrally in this species. We suggest that the distinct functions of KLK8 likely became obsolete in the aquatic environment, leading to the subsequent loss of KLK8 in several fully-aquatic mammalian lineages. First, the cetacean and manatee skin lacks sweat glands as an adaptation to the aquatic environment, which likely made the epidermal function of KLK8 obsolete. Second, cetaceans and manatees exhibit a proportionally small hippocampus, which may have rendered the hippocampal functions of KLK8 obsolete. Together, our results shed light on the genomic changes that correlate with skin and neuroanatomical differences of aquatic mammals, and show that even pleiotropic genes can be lost during evolution if an environmental change nullifies the need for the different functions of such genes." @default.
• W2770668845 created "2017-12-04" @default.
• W2770668845 creator A5006646343 @default.
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• W2770668845 date "2017-11-14" @default.
• W2770668845 modified "2023-10-10" @default.
• W2770668845 title "Transition to an aquatic habitat permitted the repeated loss of the pleiotropic KLK8 gene in mammals" @default.
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• W2770668845 doi "https://doi.org/10.1093/gbe/evx239" @default.
• W2770668845 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5716171" @default.
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• W2770668845 hasPublicationYear "2017" @default.
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