Kleefstra syndrome in Hungarian patients: additional symptoms besides the classic phenotype

Hadzsiev, Kinga and Komlósi, Katalin and Czakó, Márta and Duga, Balázs and Szalai, Renáta and Szabó, András and Pöstyéni, Etelka and Szabó, Titanilla and Kosztolányi, György and Melegh, Béla (2016) Kleefstra syndrome in Hungarian patients: additional symptoms besides the classic phenotype. Molecular Cytogenetics, 9 (22). pp. 1-6. ISSN 1755-8166, ESSN: 1755-8166


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BACKGROUND: Kleefstra syndrome is a rare genetic disorder, with core phenotypic features encompassing developmental delay/intellectual disability, characteristic facial features - brachy(micro)cephaly, unusual shaped eyebrows, flat face with hypertelorism, short nose with anteverted nostrils, thickened lower lip, carpmouth with macroglossia - and childhood hypotonia. Some additional symptoms are observed in different percentage of the patients. Epilepsy is common symptom as well. The underlying cause of the syndrome is a submicroscopic deletion in the chromosomal region 9q34.3 or disruption of the euchromatin histone methyl transferase 1. CASE PRESENTATION: We describe two Hungarian Kleefstra syndrome patients, one with the classic phenotype of the syndrome, the diagnosis was confirmed by subtelomeric FISH. Meanwhile in our second patient beside the classic phenotype a new symptom - abnormal antiepileptic drug metabolic response - could be observed. Subtelomere FISH confirmed the 9q34.3 terminal deletion. Because of the abnormal drug metabolism in our second patient, we performed array CGH analysis as well searching for other rearrangements. Array CGH analysis indicated a large - 1.211 Mb -, deletion only in the 9q subtelomeric region with breakpoints ch9:139,641,471-140,852,911. CONCLUSIONS: This is the first report on Kleefstra syndrome in patients describing a classical and a complex phenotype involving altered drug metabolism. KEYWORDS: 9q subtelomeric deletion syndrome; Drug metabolism; Epilepsy; Kleefstra syndrome

Item Type: Article
Uncontrolled Keywords: Kleefstra syndrome, 9q subtelomeric deletion syndrome, Epilepsy, Drug metabolism
Subjects: R Medicine / orvostudomány > RJ Pediatrics / gyermekgyógyászat
Depositing User: Dr. Katalin Komlosi
Date Deposited: 02 Oct 2016 18:43
Last Modified: 02 Oct 2016 18:43

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