Detecting Special Genes in Marine Symbionts: A Phylogeny-Deviation Approach Identifies Recombination-Enhancing Variants
Zhou, X.; Li, W.; Xie, S.; Xia, K.; Xiao, M.; Yang, X.; Li, Z.
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Different microbes possess special traits that enable adaptation to their specific niches, often through specialized genes. Identifying such species-special genes provides insights into microbial physiology and offers new tools for bioengineering. However, beyond the search for orphan genes, there are few methods for detecting genes that are homologous to those in other species yet contain unusual functional regions. In investigating the extreme recombination frequency of the marine symbiont bacterium Ca. E. kahalalidifaciens, we developed a computational approach to identify vairants that substantially deviate from phylogenetic expectations. This unbiased strategy successfully identified multiple Holliday junctions-related genes in Ca. E. kahalalidifaciens as candidates responsible for its exceptional recombination capacity. Heterologous expression of these gene variants in Escherichia coli significantly enhanced recombination efficiency. These high-efficient variants offer insights into improving tools for genetic manipulations, and our gene-identification approach can be applied broadly for microbial genome mining.
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