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Genet Med. 2009 Nov;11(11):797-805. doi: 10.1097/GIM.0b013e3181bd38a9.

Genotype-phenotype analysis of TCF4 mutations causing Pitt-Hopkins syndrome shows increased seizure activity with missense mutations.

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1
Signature Genomic Laboratories, 2820 N. AstorStreet, Spokane, WA 99207, USA.

Abstract

PURPOSE:

Pitt-Hopkins syndrome is characterized by severe mental retardation, characteristic dysmorphic features, and susceptibility to childhood-onset seizures and intermittent episodes of hyperventilation. This syndrome is caused by haploinsufficiency of TCF4, which encodes a basic helix-loop-helix transcription factor. Missense, nonsense, splice-site mutations, and gene deletions have been found in individuals with Pitt-Hopkins syndrome. Previous reports have suggested that the Pitt-Hopkins syndrome phenotype is independent of mutation or deletion type.

METHODS:

We screened 13,186 individuals with microarray-based comparative genomic hybridization. We also conducted a review of the literature and statistical analysis of the phenotypic features for all individuals with confirmed mutations or deletions of TCF4.

RESULTS:

We identified seven individuals with TCF4 deletions. All patients have features consistent with Pitt-Hopkins syndrome, although only three have breathing anomalies, and none has seizures. Our review of previously reported cases with TCF4 mutations and deletions showed that all patients with Pitt-Hopkins syndrome reported to date have severe psychomotor retardation, the onsets of seizures and hyperventilation episodes are limited to the first decade in most reported patients with Pitt-Hopkins syndrome, hyperventilation episodes are more common than seizures and are seen in the oldest patients, and individuals with missense TCF4 mutations are more likely to develop seizures.

CONCLUSIONS:

On the basis of an analysis of published cases, we propose a genotype-phenotype correlation of increased seizure activity with missense TCF4 mutations.

PMID:
19938247
DOI:
10.1097/GIM.0b013e3181bd38a9
[Indexed for MEDLINE]
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