EYA1-related disorders: two clinical cases and a literature review.

Alessandro Castiglione, Salvatore Melchionda, Massimo Carella, Patrizia Trevisi, Roberto Bovo, Renzo Manara, Alessandro Martini

Journal: International journal of pediatric otorhinolaryngology 2015;78(8):1201-10

PMID: 24803398

Full Text on Elsevier Science View on PubMed

Abstract

OBJECTIVES

To delineate the diagnostic and rehabilitative aspects of syndromes that have overlapping features, we present the cases of two unrelated Caucasian males affected by hearing impairment, preauricular pits and cervical fistulae. Specific findings that are helpful in the diagnosis and management of EYA1-related disorders are highlighted.

METHODS

Genetic, otologic, imaging, eye and renal evaluations were conducted to achieve a detailed and comprehensive assessment, leading to the most accurate diagnosis and appropriate treatment. A literature review was also carried out.

RESULTS

Diagnostic criteria indicated that the two patients were affected by BOS1 (Branchio-Otic Syndrome 1). We also identified a novel sporadic missense mutation in the EYA1 gene: p.G533R (c.1597G>A, NM_000503.4), a highly conserved, heterozygotic amino acid substitution. In the other case, we identified the p.X593QextX6 (c.1777T>A, NM_000503.4) substitution. Both variants lead to isoform 1 (EYA1B and EYA1C) which is composed of 592 amino acids. Clinical and in silico evidence suggests a pathogenic role for the new mutations. Imaging evaluation revealed a complex pathology, characterized by external, inner and middle ear malformations, without renal anomalies.

CONCLUSIONS

Our results demonstrate the importance of considering the imaging evaluation and the complete DNA sequencing of the EYA1 gene for the differential diagnosis of deafness and related branchio-oto-renal disorders.

Address: Department of Neurosciences, Operative Unit of Otolaryngology and Otosurgery, University of Padua, Via Giustiniani, 2, Padua, Italy. Electronic address: [email protected].; Unit of Medical Genetics, IRCCS, "Casa Sollievo della Sofferenza" Hospital, 71013 San Giovanni Rotondo, Italy. Electronic address: [email protected].; Unit of Medical Genetics, IRCCS, "Casa Sollievo della Sofferenza" Hospital, 71013 San Giovanni Rotondo, Italy. Electronic address: [email protected].; Department of Neurosciences, Operative Unit of Otolaryngology and Otosurgery, University of Padua, Via Giustiniani, 2, Padua, Italy. Electronic address: [email protected].; Department of Neurosciences, Operative Unit of Otolaryngology and Otosurgery, University of Padua, Via Giustiniani, 2, Padua, Italy. Electronic address: [email protected].; Neuroradiologic Unit, University of Padua, Via Giustiniani, 2, Padua, Italy. Electronic address: [email protected].; Department of Neurosciences, Operative Unit of Otolaryngology and Otosurgery, University of Padua, Via Giustiniani, 2, Padua, Italy. Electronic address: [email protected].

DOI: 10.1016/j.ijporl.2014.03.032

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MeSH Terms: Adult, Amino Acid Substitution, Audiometry, Pure-Tone, Branchio-Oto-Renal Syndrome, Child, Ear, Inner, Ear, Middle, Exons, Humans, Intracellular Signaling Peptides and Proteins, Male, Mutation, Missense, Nuclear Proteins, Phenotype, Protein Isoforms, Protein Tyrosine Phosphatases, Radiography, Sequence Analysis, DNA