Activation of the Fanconi anemia (FA) DNA damage-response pathway results in the monoubiquitination of FANCD2, which is regulated by the nuclear FA core ubiquitin ligase complex. A FANCD2 protein sequence-based homology search facilitated the discovery of FANCI, a second monoubiquitinated component of the FA pathway. Biallelic mutations in the gene coding for this protein were found in cells from four FA patients, including an FA-I reference cell line.
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