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Analysis of p.Gly12Valfs*2, p.Trp24* and p.Trp77Arg mutations in GJB2 and p.Arg81Gln variant in LRTOMT among non syndromic hearing loss Egyptian patients: implications for genetic diagnosis

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Abstract

Hearing loss (HL) is a global sensory disorder that affects children and deprives them from their rights to enjoy standard social and educational levels. Although hundreds of genetic mutations across several genes have been linked to HL, very limited studies are available on Egyptian population which has high rate of consanguinity and HL. The frequency of the p.Gly12Valfs*2, p.Trp24* and p.Trp77Arg mutations in GJB2 along with the p.Arg81Gln variant in LRTOMT gene was investigated in Egyptian patients. 103 non-syndromic HL (NSHL) Egyptian patients and 100 control subjects were recruited in this study. PCR-RFLP and Direct sequencing were performed to screen and confirm presence/absence of those mutations in Egyptian population. The p.Gly12Valfs*2 mutation was found in eight patients (7.8%) (six homozygous and two heterozygous) with an allele frequency of 6.8%. The p.Trp24* and p.Trp77Arg were absent in both HL patients and controls. Another one patient had the heterozygous variant for p.Arg81Gln in LRTOMT gene. This study reports, for the first time, the presence of a heterozygous change for the p.Arg81Gln in LRTOMT gene in one Egyptian patient. The p.Gly12Valfs*2 mutation, but not the p.Trp24* nor the p.Trp77Arg, in GJB2 is the most frequent variant among Egyptian patients and would therefore be recommended for genetic counseling and diagnosis.

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Acknowledgements

This work was carried out with the support of The British University in Egypt (BUE) under the following research Grant Numbers (YIRG2015.7 and YIRG2017.7) that were awarded to Dr. Gibriel.

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Authors and Affiliations

  1. Biochemistry and Molecular Biology Department, Faculty of Pharmacy, The British University in Egypt (BUE), P.O. Box 259, 11728, Cairo, Egypt

    Abdullah A. Gibriel

  2. Otorhinolaryngology Department, Audio-Vestibular Unit, Faculty of Medicine, Kasr Al-Aini El-Manial University Hospital, Cairo University, Giza, Egypt

    Maha H. Abou-Elew

  3. Laboboratoire Procédés de Criblage Moléculaire et Cellulaire, Centre de Biotechnologie de Sfax, Université de Sfax, Sfax, Tunisia

    Saber Masmoudi

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  1. Abdullah A. Gibriel
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  2. Maha H. Abou-Elew
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  3. Saber Masmoudi
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AAG & SM conceived and designed the experiment. MHA and AAG collected samples and obtained patients’ clinical data. AAG performed experimental work, statistical analysis and secured funding. AAG, SM and MHA drafted the manuscript.

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Correspondence to Abdullah A. Gibriel.

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Gibriel, A.A., Abou-Elew, M.H. & Masmoudi, S. Analysis of p.Gly12Valfs*2, p.Trp24* and p.Trp77Arg mutations in GJB2 and p.Arg81Gln variant in LRTOMT among non syndromic hearing loss Egyptian patients: implications for genetic diagnosis. Mol Biol Rep 46, 2139–2145 (2019). https://doi.org/10.1007/s11033-019-04667-0

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