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Updated: Jun 12, 2025

Reverse Genetic Approach to Identify Regulators of Pigmentation using Zebrafish
Published on: March 1, 2022
Segregation Between an Ornamental and a Disease Driver Gene Provides Insights Into Pigment Cell Regulation
Erika Soria1, Qiusheng Lu2, Will Boswell1
1The Xiphophorus Genetic Stock Center, Texas State University, San Marcos, Texas, USA.
None:
Genetic interactions are adaptive within a species. Hybridization can disrupt such species-specific genetic interactions and creates novel interactions that alter the hybrid progeny overall fitness. Hybrid incompatibility, which refers to degenerative genetic interactions that decrease the overall hybrid survival and sterility, is one of the results from combining two diverged genomes in hybrids. The discovery of spontaneous lethal tumorigenesis and underlying genetic interactions in select hybrids between diverged Xiphophorus species showed that lethal pathological process can result from degenerative genetic interactions. Such genetic interactions leading to lethal phenotype are thought to shield gene flow between diverged species. However, hybrids between certain Xiphophorus species do not develop such tumors. Here we report the identification of a locus residing in the genome of one Xiphophorus species that represses an oncogene from a different species. Our finding provides insights into normal and pathological pigment cell development, regulation and a molecular mechanism in hybrid incompatibility.
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