Variation in phenotype, genotype, and somatic diversity among asexual <i>Schmidtea mediterranea</i> planarians.

ABSTRACT: Most multicellular life reproduces sexually, utilizing a single-celled stage that acts as a genetic bottleneck. This bottleneck limits the evolution of selfish cell adaptations by ensuring all cells descend from a single progenitor. We investigated an obligately asexual strain of Schmidtea mediterranea planarians that reproduces by self-bisection and lacks a single-cell bottleneck. Using 2.5 yearlong data on planarian reproductive behavior combined with genotyping, we revealed two previously undescribed genetically distinct substrains within the CIW4 strain. One substrain showed reduced fitness, which correlated with substantial losses of heterozygosity and increased somatic diversity. By genotyping consecutive head offspring over multiple generations, we found that only ∼9% of pote

SUBMITTER: Kershenbaum S 

PROVIDER: S-EPMC12284295 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature