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Cri du chat syndrome is a chromosomal disorder caused by deletions in the short arm of chromosome 5, which vary in size, from very small and involving only the 5p15.2 locus, to the loss of the entire short arm. Mutations originate de novo in 80% to 90% of cases. There are two critical regions for Cri du chat syndrome; one located at 5p15.3 with a deletion that is manifested as a cat’s cry and speech delay, and another located at 5p15.2 with a deletion that manifests as microcephaly, hypertelorism, severe psychomotor and mental retardation. Several involved genes located in these critical regions have been described; among them, TERT, SEMA5A, CTNND2 and MARCHF6, and whose haploinsufficiency is associated with the different phenotypes of Cri du chat. This article describes the clinical case of an 8-monthold female patient, with clinical characteristics and a mosaic cytogenetic analysis that confirmed Cri du chat syndrome. This case is the first reported of this variant in southwestern Colombia.

Síndrome de Cri du chat: primer reporte en mosaico en el suroccidente colombiano