Further evidence that a blepharophimosis syndrome phenotype is associated with a specific class of mutation in the ADNP gene

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Abstract

Heterozygous truncating mutations in ADNP are associated with a syndromic form of intellectual disability known as Helsmoortel-van der Aa syndrome. Among 17 previously reported patients with Helsmoortel-van der Aa syndrome, one patient exhibited blepharophimosis. Whether blepharophimosis represents a phenotypic expression of the ADNP mutation spectrum or a chance association remains unclear. Herein, we report another patient with a de novo truncating mutation in ADNP who exhibited a combination of blepharophimosis and epicanthal folds. In our retrospective re-evaluation of six originally reported patients whose facial photographs were available, at least one patient indeed had blepharophimosis and epicanthal folds. Furthermore, all three patients with blepharophimosis and epicanthal folds, including the presently reported patient, had truncating mutations at the same specific portion of the protein, that is the bipartite nuclear localization signal. We suggest that this specific class of ADNP mutation is likely associated with a blepharophimosis syndrome phenotype. From a clinical standpoint, a differential diagnosis of patients with blepharophimosis should include ADNP mutations in addition to blepharophimosis ptosis epicanthus inversus syndrome, especially when intellectual disability is present.

Original languageEnglish
Pages (from-to)1631-1634
Number of pages4
JournalAmerican Journal of Medical Genetics, Part A
Volume173
Issue number6
DOIs
Publication statusPublished - 2017 Jun 1

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Blepharophimosis
Phenotype
Mutation
Genes
Intellectual Disability
Nuclear Localization Signals
Blepharophimosis, Ptosis, and Epicanthus Inversus
Differential Diagnosis

Keywords

  • ADNP
  • bipartite nuclear localization signal
  • blepharophimosis
  • blepharophimosis, ptosis, and epicanthus inversus syndrome
  • Helsmoortel-van der Aa syndrome
  • nonsense mediated mRNA decay

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

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title = "Further evidence that a blepharophimosis syndrome phenotype is associated with a specific class of mutation in the ADNP gene",
abstract = "Heterozygous truncating mutations in ADNP are associated with a syndromic form of intellectual disability known as Helsmoortel-van der Aa syndrome. Among 17 previously reported patients with Helsmoortel-van der Aa syndrome, one patient exhibited blepharophimosis. Whether blepharophimosis represents a phenotypic expression of the ADNP mutation spectrum or a chance association remains unclear. Herein, we report another patient with a de novo truncating mutation in ADNP who exhibited a combination of blepharophimosis and epicanthal folds. In our retrospective re-evaluation of six originally reported patients whose facial photographs were available, at least one patient indeed had blepharophimosis and epicanthal folds. Furthermore, all three patients with blepharophimosis and epicanthal folds, including the presently reported patient, had truncating mutations at the same specific portion of the protein, that is the bipartite nuclear localization signal. We suggest that this specific class of ADNP mutation is likely associated with a blepharophimosis syndrome phenotype. From a clinical standpoint, a differential diagnosis of patients with blepharophimosis should include ADNP mutations in addition to blepharophimosis ptosis epicanthus inversus syndrome, especially when intellectual disability is present.",
keywords = "ADNP, bipartite nuclear localization signal, blepharophimosis, blepharophimosis, ptosis, and epicanthus inversus syndrome, Helsmoortel-van der Aa syndrome, nonsense mediated mRNA decay",
author = "Toshiki Takenouchi and Tomoru Miwa and Yoshiaki Sakamoto and Yuri Sakaguchi and Tomoko Uehara and Takao Takahashi and Kenjiro Kosaki",
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T1 - Further evidence that a blepharophimosis syndrome phenotype is associated with a specific class of mutation in the ADNP gene

AU - Takenouchi, Toshiki

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AU - Sakamoto, Yoshiaki

AU - Sakaguchi, Yuri

AU - Uehara, Tomoko

AU - Takahashi, Takao

AU - Kosaki, Kenjiro

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AB - Heterozygous truncating mutations in ADNP are associated with a syndromic form of intellectual disability known as Helsmoortel-van der Aa syndrome. Among 17 previously reported patients with Helsmoortel-van der Aa syndrome, one patient exhibited blepharophimosis. Whether blepharophimosis represents a phenotypic expression of the ADNP mutation spectrum or a chance association remains unclear. Herein, we report another patient with a de novo truncating mutation in ADNP who exhibited a combination of blepharophimosis and epicanthal folds. In our retrospective re-evaluation of six originally reported patients whose facial photographs were available, at least one patient indeed had blepharophimosis and epicanthal folds. Furthermore, all three patients with blepharophimosis and epicanthal folds, including the presently reported patient, had truncating mutations at the same specific portion of the protein, that is the bipartite nuclear localization signal. We suggest that this specific class of ADNP mutation is likely associated with a blepharophimosis syndrome phenotype. From a clinical standpoint, a differential diagnosis of patients with blepharophimosis should include ADNP mutations in addition to blepharophimosis ptosis epicanthus inversus syndrome, especially when intellectual disability is present.

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