Fanconi anemia (FA) is a clinically and genetically heterogeneous disorder that causes genomic instability. Characteristic clinical features include developmental abnormalities in major organ systems, early-onset bone marrow failure, and a high predisposition to cancer. The cellular hallmark of FA is hypersensitivity to DNA crosslinking agents and high frequency of chromosomal aberrations pointing to a defect in DNA repair. Fanconi anemia complementation group I (FANCI) is caused by homozygous or compound heterozygous mutation in the FANCI gene  on chromosome 15q26. [From OMIM]