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- W4213130147 abstract "Abstract Background Parasite evolution has been conceptualized as a process of genetic loss and simplification. Contrary to this model, there is evidence of expansion and conservation of gene families related to essential functions of parasitism in some parasite genomes, reminiscent of widespread mosaic evolution —where subregions of a genome have different rates of evolutionary change. We found evidence of mosaic genome evolution in the cnidarian Myxobolus honghuensis , a myxozoan parasite of fish, with extremely simple morphology. Results We compared M. honghuensis with other myxozoans and free-living cnidarians, and determined that it has a relatively larger myxozoan genome (206 Mb), which is less reduced and less compact due to gene retention, large introns, transposon insertion, but not polyploidy. Relative to other metazoans, the M. honghuensis genome is depleted of neural genes and has only the simplest animal immune components. Conversely, it has relatively more genes involved in stress resistance, tissue invasion, energy metabolism, and cellular processes compared to other myxozoans and free-living cnidarians. We postulate that the expansion of these gene families is the result of evolutionary adaptations to endoparasitism. M. honghuensis retains genes found in free-living Cnidaria, including a reduced nervous system, myogenic components, ANTP class Homeobox genes, and components of the Wnt and Hedgehog pathways. Conclusions Our analyses suggest that the M. honghuensis genome evolved as a mosaic of conservative, divergent, depleted, and enhanced genes and pathways. These findings illustrate that myxozoans are not as genetically simple as previously regarded, and the evolution of some myxozoans is driven by both genomic streamlining and expansion." @default.
- W4213130147 created "2022-02-24" @default.
- W4213130147 creator A5000436416 @default.
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- W4213130147 creator A5054494992 @default.
- W4213130147 creator A5075972606 @default.
- W4213130147 creator A5078424736 @default.
- W4213130147 date "2022-02-18" @default.
- W4213130147 modified "2023-10-17" @default.
- W4213130147 title "A myxozoan genome reveals mosaic evolution in a parasitic cnidarian" @default.
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