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Clinical and mutational spectrum of Mowat-Wilson syndrome.

Zweier, C, Thiel, C, Dufke, A, Crow, YJ, Meinecke, P, Suri, M, Ala-Mello, S, Beemer, F, Bernasconi, S, Bianchi, P, Bier, A, Devriendt, K, Dimitrov, B, Firth, H, Gallagher, R, Garavelli, L, Gillessen-Kaesbach, G, Hudgins, L, Kääriäinen, H, Karstens, S, Krantz, I, Mannhardt, A, Medne, L, Mücke, J, Kibaek, M, Krogh, L, Peippo, M, Rittinger, O, Schulz, S, Schelley, S, Temple, I, Dennis, N, Van der Knaap, M, Wheeler, P, Yerushalmi, B, Zenker, M, Seidel, H, Lachmeijer, A, Prescott, T, Kraus, C, Lowry, R, Rauch, A

Eur J Med Genet. 2005;48( 2):97-111.

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Abstract

Mowat-Wilson Syndrome is a recently delineated mental retardation syndrome usually associated with multiple malformations and a recognizable facial phenotype caused by defects of the transcriptional repressor ZFHX1B. To address the question of clinical and mutational variability, we analysed a large number of patients with suspected Mowat-Wilson Syndrome (MWS). Without prior knowledge of their mutational status, 70 patients were classified into "typical MWS", "ambiguous" and "atypical" groups according to their facial phenotype. Using FISH, qPCR and sequencing, ZFHX1B deletions, splice site or truncating mutations were detected in all 28 patients classified as typical MWS. No ZFHX1B defect was apparent in the remaining 15 cases with ambiguous facial features or in the 27 atypical patients. Genotype-phenotype analysis confirmed that ZFHX1B deletions and stop mutations result in a recognizable facial dysmorphism with associated severe mental retardation and variable malformations such as Hirschsprung disease and congenital heart defects. Our findings indicate that structural eye anomalies such as microphthalmia should be considered as part of the MWS spectrum. We also show that agenesis of the corpus callosum and urogenital anomalies (especially hypospadias) are significant positive predictors of a ZFHX1B defect. Based on our observation of affected siblings and the number of MWS cases previously reported, we suggest a recurrence risk of around 1%. The lack of missense mutations in MWS and MWS-like patients suggests there may be other, as yet unrecognized phenotypes, associated with missense mutations of this transcription factor.

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Manchester eScholar ID:
uk-ac-man-scw:1d18624
Created:
30th August, 2009, 14:56:00
Last modified:
3rd March, 2010, 18:58:01

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