Next generation sequencing study in a cohort of Italian patients with syndromic hearing loss

Stefania Lenarduzzi, Anna Morgan, Flavio Faletra, Stefania Cappellani, Marcello Morgutti, Massimo Mezzavilla, Adelaide Peruzzi, Sara Ghiselli, Umberto Ambrosetti, Claudio Graziano, Marco Seri, Paolo Gasparini, Giorgia Girotto

Research output: Contribution to journalArticlepeer-review

Abstract

Hearing loss (HL), one of the most common congenital disorder, affects about one child in 1000. Among the genetic forms of HL, ∼30% of the cases are associated with other signs or symptoms, leading to Syndromic Hearing Loss (SHL) with about 700 different forms described so far. In this report, we refer the clinical and molecular data of 38 Italian SHL unrelated patients, and their relatives, affected by the most common syndromes associated with HL (i.e., Usher, Pendred, Charge, Waardenburg, Alport, Stickler, Branchiootorenal and Microdeletions syndromes). Patients have been analysed using next-generation sequencing (NGS) and High Density (HD)-SNP array technologies. Data analysis led to the identification of nine novel and 27 known causative mutations in 12 genes and two microdeletions in chromosomes 1 and 10, respectively. In particular, as regards to Usher syndrome, that affects 32% of our patients, we were able to reach a molecular diagnosis in 83% of the cases and to identify in Northern Eastern Italy a very common USH2A gene mutation (39%) (c.11864G > A, p.(Trp3955*) which can be defined “Central-Eastern European allele.” As regards to Alport syndrome, we were able to potentially reclassify a pathogenic allele in the COL4A3 gene, previously associated only with benign familial hematuria. In all the other cases, the genomic analysis allowed us to confirm the role of known causative genes and to identify several novel and known alleles. Overall, our results highlight the effectiveness of combining an accurate clinical characterization with the use of genomic technologies (NGS and SNP arrays) for the molecular diagnosis of SHL, with a clear positive impact in the management and treatment of all the patients.

Original languageEnglish
Article number107769
JournalHearing Research
Volume381
DOIs
Publication statusPublished - Sep 15 2019

Keywords

  • Molecular diagnosis
  • Syndromic hearing loss
  • Targeted re-sequencing
  • Usher syndrome

ASJC Scopus subject areas

  • Sensory Systems

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