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Junk DNA has been long appreciated as an evolutionary facilitator because it can participate in the causation of genetic variation such as chromosome rearrangements and can be exapted into coding or regulatory elements. Recently, it has been proposed that junk DNA variation within natural populations indirectly causes a phenotypic heterogeneity that subsequently promotes genetic capacitance, i.e.,...
Junk DNA is still an enigmatic concept. Although junk DNA composition, abundance, and functionality are still contentious, its contribution to biological evolution is less questionable. Recently, I proposed that sexually restricted chromosomes such as Y and W, highly enriched in junk DNA elements, act as genomic tuning knobs indirectly causing a genome-wide increase in gene expression heterogeneity...
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