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

Abstract：

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.

journal_name

Mol Cytogenet

journal_title

Molecular cytogenetics

authors

Hadzsiev K,Komlosi K,Czako M,Duga B,Szalai R,Szabo A,Postyeni E,Szabo T,Kosztolanyi G,Melegh B

doi

10.1186/s13039-016-0231-2

subject

Has Abstract

pub_date

2016-02-25 00:00:00

pages

22

issn

1755-8166

pii

231

journal_volume

9

pub_type

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