Chromodomain Y-linked protein 2A (CDY2A)

Chromodomain Y-linked protein 2A (CDY2A) is a Y-chromosome–encoded, intronless protein characterized by an N-terminal chromodomain and a C-terminal histone acetyltransferase domain. CDY2A is mainly expressed in testis, localized to the nucleus of late spermatids, and is implicated in facilitating histone hyperacetylation. This epigenetic modification is crucial for replacing histones with protamines—an essential step for sperm DNA compaction and maturation. Chromodomain proteins, including CDY2A, are components of heterochromatin-like complexes and can act as gene repressors. Mutations or deletions in CDY2A are implicated in certain types of spermatogenic failure (a cause of male infertility). There are no drugs known to interact with this molecule, and it does not serve as a current therapeutic target in clinical applications. There are paralogs such as CDY2B, and the chromodomain Y family is generally involved in chromatin regulation, but CDY2A itself has a highly specialized, testis-specific function.

Other names

Testis-specific chromodomain protein Y 2CDY2ACDY2Y chromosome chromodomain protein 2AChromodomain protein, Y-linked, 2AChromodomain protein, Y chromosome, 2

No drugs target CDY2A directly; known mechanisms are epigenetic/chromatin regulation by the endogenous protein