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Article Abstract
Alu sequences are the most abundant repetitive elements in the human genome, and have proliferated to more than one million copies in the human genome. Primate-specific Alu sequences account for ~10% of the human genome, and their spread within the genome has the potential to generate new exons. The new exons produced by Alu elements appear in various primate genes, and their functions have been elucidated. Here, we identified a new exon in the insulin-like 3 gene (INSL3), which evolved ~50 million years ago, and led to a splicing variant with 31 extra amino acid residues in addition to the original 95 nucleotides (NTs) of INSL3. The Alu-INSL3 isoform underwent diverse changes during primate evolution; we identified that human Alu-INSL3 might be on its way to functionality and has potential to antagonize LGR8-INSL3 function. Therefore, the present study is designed to provide an example of the evolutionary trajectory of a variant peptide hormone antagonist that caused by the insertion of an Alu element in primates.
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| http://dx.doi.org/10.1016/j.gene.2020.144861 | DOI Listing |
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