Kleefstra syndrome in Hungarian patients

Additional symptoms besides the classic phenotype

Kinga Hadzsiev, K. Komlósi, Marta Czako, Balazs Duga, Renata Szalai, Andras Szabo, Etelka Postyeni, Titanilla Szabo, G. Kosztolányi, B. Melegh

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Article number22
JournalMolecular Cytogenetics
Volume9
Issue number1
DOIs
Publication statusPublished - Feb 25 2016

Fingerprint

Metabolism
Phenotype
Transferases
Pharmaceutical Preparations
Anticonvulsants
Histones
Macroglossia
Euchromatin
Hypertelorism
Eyebrows
Inborn Genetic Diseases
Muscle Hypotonia
Lip
Nose
Intellectual Disability
Epilepsy
Kleefstra Syndrome

Keywords

  • 9q subtelomeric deletion syndrome
  • Drug metabolism
  • Epilepsy
  • Kleefstra syndrome

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology
  • Genetics(clinical)
  • Biochemistry
  • Molecular Medicine
  • Biochemistry, medical

Cite this

Kleefstra syndrome in Hungarian patients : Additional symptoms besides the classic phenotype. / Hadzsiev, Kinga; Komlósi, K.; Czako, Marta; Duga, Balazs; Szalai, Renata; Szabo, Andras; Postyeni, Etelka; Szabo, Titanilla; Kosztolányi, G.; Melegh, B.

In: Molecular Cytogenetics, Vol. 9, No. 1, 22, 25.02.2016.

Research output: Contribution to journalArticle

Hadzsiev, Kinga ; Komlósi, K. ; Czako, Marta ; Duga, Balazs ; Szalai, Renata ; Szabo, Andras ; Postyeni, Etelka ; Szabo, Titanilla ; Kosztolányi, G. ; Melegh, B. / Kleefstra syndrome in Hungarian patients : Additional symptoms besides the classic phenotype. In: Molecular Cytogenetics. 2016 ; Vol. 9, No. 1.
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