Abstract
Greig cephalopolysyndactyly (GCPS; OMIM 175700) is an autosomal dominant condition caused by mutations of the gene GLI3, located on 7p13. To date, several cases of deletions and/or translocations involving this locus have been reported in patients with GCPS. GLI3 is a transcription factor from the GLI-Kruppel gene family that has been implicated in three distinct entities: GCPS, Pallister-Hall syndrome, and postaxial polydactyly type A. The zinc finger protein, subfamily 1, member 1 gene (ZNFN1A1; OMIM 603023), on 7p12, codes for a lymphoid-restricted zinc finger transcription factor, ZNFN1A1, also called IKAROS, that regulates lymphocyte differentiation and has been associated with the development of childhood leukemia. We present the case of a 9-year-old Latin-American boy who was referred for stem cell transplantation because of recurrent acute lymphoblastic leukemia (ALL). On evaluation, he was found to have dysmorphic features consistent with GCPS, including a prominent forehead, down-slanting palpebral fissures, 1-2-3 toe syndactyly, broad thumbs and first toes, and mild developmental delay. He had developed ALL at 5 years of age. Chromosome analysis of bone marrow and fibroblastic cells showed an interstitial deletion of...Continue Reading
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