Abstract
A chromodomain is a domain contained in various proteins involved in chromatin remodeling and the regulation of gene expression in eukaryotes during development. Chromodomains perform a wide range of diverse functions including chromatin targeting and interactions between different proteins, RNA, and DNA. The chromodomains also have been found as an additional domain at the C-terminal region of Polyproteins (Pol) encoded by transposable elements which belong to the Gypsy LTR retrotransposons superfamily. Chromoviruses or chromodomain-containing Gypsy LTR retrotransposons form the most widespread clade of Gypsy LTR retrotransposons and can be found in diverse eukaryotes including plants, fungi, and vertebrates. The recent finding suggested that chromodomains can be responsible for the targeted integration of LTR retrotransposons and, thus, should be favorable for mobile elements by allowing them to avoid negative selection arising from insertion into coding regions.
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