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Enlarged vestibular aqueduct: Looking for genotypic-phenotypic correlations
José Angel González-García1, Andrés Ibáñez, Rafael Ramírez-Camacho
1Grupo de Investigación Otológica (Otologic Research Group), Department of Otorhinolaryngology, Servicio de Otorrinolaringología, Hospital Universitario Puerta de Hierro, Calle San Martín de Porres 4, 28035 Madrid, Spain. joseangelgg@seorl.net
Summary
Enlarged vestibular aqueduct syndrome (EVAS) diagnosis is guided by genetic factors. While several genetic syndromes can cause EVAS, some familial cases lack identified mutations, complicating diagnosis.
Area of Science:
- Otolaryngology
- Medical Genetics
- Pediatrics
Background:
- Enlarged vestibular aqueduct syndrome (EVAS) is a common cause of sensorineural hearing loss in children.
- The genetic basis of EVAS is complex and not fully understood.
- Accurate diagnosis and classification are crucial for appropriate management.
Purpose of the Study:
- To provide a comprehensive guide for the clinical and genetic diagnosis and classification of EVAS.
- To review the literature and identify known genetic associations with the EVAS phenotype.
- To highlight challenges in diagnosing EVAS, particularly in familial cases without identified mutations.
Main Methods:
- Literature review of computerized databases using keywords 'large' and 'enlarged vestibular aqueduct'.
- Analysis of articles reporting associations between the EVAS phenotype and genetic alterations.
- Compilation of known genetic syndromes that can manifest as EVAS.
Main Results:
- Fewer than 40 articles described a clear association between the EVAS phenotype and a known genetic alteration.
- Several genetic syndromes, including Pendred syndrome, Waardenburg syndrome, and branchio-oto-renal syndrome, can present with EVAS.
- Familial cases of EVAS were reported without identified mutations in studied genes.
Conclusions:
- EVAS diagnosis requires a multidisciplinary approach integrating clinical and genetic findings.
- Understanding the genetic heterogeneity of EVAS is essential for accurate classification.
- Further research is needed to elucidate the genetic causes of EVAS in cases with no identified mutations.