Novel mutation in ABBC9 gene associated with congenital hypertrichosis and acromegaloid facial features, without cardiac or skeletal anomalies: a new phenotype

Abstract

Harry Pachajoa,1,2 William López-Quintero,3 Sara Vanegas,1 Claudia L Montoya,3 Diana Ramírez-Montaño1 1Department of Basic Medical Sciences, Center for Research on Congenital Anomalies and Rare Diseases (CIACER), Universidad Icesi, Cali, Valle del Cauca, Colombia; 2Pediatric Medical Genetics, Fundación Valle del Lili, Cali, Valle del Cauca, Colombia; 3Dermatology Department, Fundación Valle del Lili, Cali, Valle del Cauca, Colombia Introduction: Mutations in ABCC9 are associated with Cantú syndrome (CS), a very rare genetic disorder characterized by congenital hypertrichosis, acromegaloid facial appearance (AFA), cardiomegaly, and skeletal anomalies.Case report: We report an 8-year-old female patient with congenital generalized hypertrichosis and coarse facial appearance but without cardiovascular or skeletal compromise. Whole exome sequencing revealed a novel de novo heterozygous mutation in ABCC9. In addition, the genotype and phenotype of the patient were compared with those of the patients reported in the literature and with other related conditions that include AFA, hypertrichosis and AFA, and CS.Conclusion: This is the first report of a South-American patient with mutation in ABCC9. We propose that her phenotype is a part of a spectrum of features associated with congenital hypertrichosis and mutations in ABCC9, which differs from CS and related disorders. Whole exome sequencing enabled the identification of the causality of this disease characterized by high clinical and genetic heterogeneity. Keywords: hypertrichosis, acromegaloid features, AFA syndrome, Cantú syndrome

Keywords

• Hypertrichosis
• Acromegaloid features
• AFA syndrome
• Cantú Syndrome