Clinical and Neurobehavioral Features of Three Novel Kabuki Syndrome Patients with Mosaic KMT2D Mutations and a Review of Literature
oleh: Francesca Romana Lepri, Dario Cocciadiferro, Bartolomeo Augello, Paolo Alfieri, Valentina Pes, Alessandra Vancini, Cristina Caciolo, Gabriella Maria Squeo, Natascia Malerba, Iolanda Adipietro, Antonio Novelli, Stefano Sotgiu, Renzo Gherardi, Maria Cristina Digilio, Bruno Dallapiccola, Giuseppe Merla
| Format: | Article |
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| Diterbitkan: | MDPI AG 2017-12-01 |
Deskripsi
Kabuki syndrome (KS) is a rare disorder characterized by multiple congenital anomalies and variable intellectual disability caused by mutations in KMT2D/MLL2 and KDM6A/UTX, two interacting chromatin modifier responsible respectively for 56–75% and 5–8% of the cases. To date, three KS patients with mosaic KMT2D deletions in blood lymphocytes have been described. We report on three additional subjects displaying KMT2D gene mosaics including one in which a single nucleotide change results in a new frameshift mutation (p.L1199HfsX7), and two with already-known nonsense mutations (p.R4484X and p.R5021X). Consistent with previously published cases, mosaic KMT2D mutations may result in mild KS facial dysmorphisms and clinical and neurobehavioral features, suggesting that these characteristics could represent the handles for genetic testing of individuals with slight KS-like traits.