Wings apart-like protein homolog (WAPL)

Wings apart-like protein homolog (WAPL) is a highly conserved eukaryotic protein that regulates chromosome architecture by controlling the dynamic association of the cohesin complex with chromatin through the cell cycle[1][2][3]. WAPL forms complexes with Pds5 to mediate the release of cohesin rings from chromatin, enabling chromosome segregation during mitosis and contributing to higher-order chromatin organization[1][2][3][5]. The protein features a flexible N-terminal domain and a conserved C-terminal domain composed of HEAT repeats, and it binds cohesin using specific recognition motifs[1][3][4]. Disruption of WAPL activity leads to chromosome segregation errors, highlighting its importance in genomic stability; however, WAPL itself is not a direct therapeutic target, and no drugs selectively modulate its activity as of current knowledge[2][5]. Key insights: - WAPL acts as a critical negative regulator of cohesin, controlling the timing of sister chromatid separation by releasing cohesin from chromosomes prior to anaphase[1][2][5]. - Mutations or experimental depletion of WAPL cause defects in chromosome segregation and lead to genomic instability[2][5]. - While WAPL is crucial for cell division fidelity, its direct pharmacological targeting is not established; rather, research focuses on cohesin pathway modulation for cancer and other disease states[2][4].

Other names

WAPLWAPALFOEKIAA0261Friend of EBNA2 proteinwings apart-like protein homologfriend of EBNA2 (Epstein-Barr virus nuclear antigen 2)WAPL cohesin release factor

Not applicable (no drugs currently target WAPL directly; mechanistically, WAPL triggers opening of cohesin ring and release from DNA by interacting with specific cohesin subunits)