Molecular genetics of MARVELD2 and clinical phenotype in Pakistani and Slovak families segregating DFNB49 hearing loss

Gowri Nayak, Lukas Varga, Claire Trincot, Mohsin Shahzad, Penelope L. Friedman, Iwar Klimes, John H. Greinwald, S. Amer Riazuddin, Ivica Masindova, Milan Profant, Shaheen N. Khan, Thomas B. Friedman, Zubair M. Ahmed, Daniela Gasperikova, Sheikh Riazuddin, Saima Riazuddin

Research output: Contribution to journalArticle

Abstract

Pathogenic mutations of MARVELD2, encoding tricellulin, a tricelluar tight junction protein, cause autosomal recessive non-syndromic hearing loss (DFNB49) in families of Pakistan and Czech Roma origin. In fact, they are a significant cause of prelingual hearing loss in the Czech Roma, second only to GJB2 variants. Previously, we reported that mice homozygous for p.Arg497* variant of Marveld2 had a broad phenotypic spectrum, where defects were observed in the inner ear, heart, mandibular salivary gland, thyroid gland and olfactory epithelium. The current study describes the types and frequencies of MARVELD2 alleles and clinically reexamines members of DFNB49 families. We found that MARVELD2 variants are responsible for about 1.5 % (95 % CI 0.8–2.6) of non-syndromic hearing loss in our cohort of 800 Pakistani families. The c.1331+2T>C allele is recurrent. In addition, we identified a novel large deletion in a single family, which appears to have resulted from non-allelic homologous recombination between two similar Alu short interspersed elements. Finally, we observed no other clinical manifestations co-segregating with hearing loss in DFNB49 human families, and hypothesize that the additional abnormalities in the Marveld2 mutant mouse indicates a critical non-redundant function for tricellulin in other organ systems.

Original languageEnglish (US)
Pages (from-to)423-437
Number of pages15
JournalHuman genetics
Volume134
Issue number4
DOIs
StatePublished - Mar 10 2015

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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    Nayak, G., Varga, L., Trincot, C., Shahzad, M., Friedman, P. L., Klimes, I., Greinwald, J. H., Riazuddin, S. A., Masindova, I., Profant, M., Khan, S. N., Friedman, T. B., Ahmed, Z. M., Gasperikova, D., Riazuddin, S., & Riazuddin, S. (2015). Molecular genetics of MARVELD2 and clinical phenotype in Pakistani and Slovak families segregating DFNB49 hearing loss. Human genetics, 134(4), 423-437. https://doi.org/10.1007/s00439-015-1532-y