Novel sequence variants in the TMIE gene in families with autosomal recessive nonsyndromic hearing impairment

Regie Lyn P Santos, Hatem El-Shanti, Shaheen Sikandar, Kwanghyuk Lee, Attya Bhatti, Kai Yan, Maria H. Chahrour, Nathan McArthur, Thanh L. Pham, Amjad Abdullah Mahasneh, Wasim Ahmad, Suzanne M. Leal

Research output: Contribution to journalArticle

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Abstract

To date, 37 genes have been identified for nonsyndromic hearing impairment (NSHI). Identifying the functional sequence variants within these genes and knowing their population-specific frequencies is of public health value, in particular for genetic screening for NSHI. To determine putatively functional sequence variants in the transmembrane inner ear (TMIE) gene in Pakistani and Jordanian families with autosomal recessive (AR) NSHI, four Jordanian and 168 Pakistani families with ARNSHI that is not due to GJB2 (CX26) were submitted to a genome scan. Two-point and multipoint parametric linkage analyses were performed, and families with logarithmic odds (LOD) scores of 1.0 or greater within the TMIE region underwent further DNA sequencing. The evolutionary conservation and location in predicted protein domains of amino acid residues where sequence variants occurred were studied to elucidate the possible effects of these sequence variants on function. Of seven families that were screened for TMIE, putatively functional sequence variants were found to segregate with hearing impairment in four families but were not seen in not less than 110 ethnically matched control chromosomes. The previously reported c.241C>T (p.R81C) variant was observed in two Pakistani families. Two novel variants, c.92A>G (p.E31G) and the splice site mutation c.212 -2A>C, were identified in one Pakistani and one Jordanian family, respectively. The c.92A>G (p.E31G) variant occurred at a residue that is conserved in the mouse and is predicted to be extracellular. Conservation and potential functionality of previously published mutations were also examined. The prevalence of functional TMIE variants in Pakistani families is 1.7% [95% confidence interval (CI) 0.3-4.8]. Further studies on the spectrum, prevalence rates, and functional effect of sequence variants in the TMIE gene in other populations should demonstrate the true importance of this gene as a cause of hearing impairment.

Original languageEnglish
Pages (from-to)226-231
Number of pages6
JournalJournal of Molecular Medicine
Volume84
Issue number3
DOIs
Publication statusPublished - Mar 2006
Externally publishedYes

Fingerprint

Inner Ear
Genes
Hearing Loss
Mutation
Genetic Testing
DNA Sequence Analysis
Population
Amino Acid Sequence
Public Health
Chromosomes
Nonsyndromic Deafness
Genome
Confidence Intervals

Keywords

  • Autosomal recessive nonsyndromic hearing impairment
  • Jordan
  • Pakistan
  • Prevalence
  • TMIE

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Santos, R. L. P., El-Shanti, H., Sikandar, S., Lee, K., Bhatti, A., Yan, K., ... Leal, S. M. (2006). Novel sequence variants in the TMIE gene in families with autosomal recessive nonsyndromic hearing impairment. Journal of Molecular Medicine, 84(3), 226-231. https://doi.org/10.1007/s00109-005-0015-3

Novel sequence variants in the TMIE gene in families with autosomal recessive nonsyndromic hearing impairment. / Santos, Regie Lyn P; El-Shanti, Hatem; Sikandar, Shaheen; Lee, Kwanghyuk; Bhatti, Attya; Yan, Kai; Chahrour, Maria H.; McArthur, Nathan; Pham, Thanh L.; Mahasneh, Amjad Abdullah; Ahmad, Wasim; Leal, Suzanne M.

In: Journal of Molecular Medicine, Vol. 84, No. 3, 03.2006, p. 226-231.

Research output: Contribution to journalArticle

Santos, RLP, El-Shanti, H, Sikandar, S, Lee, K, Bhatti, A, Yan, K, Chahrour, MH, McArthur, N, Pham, TL, Mahasneh, AA, Ahmad, W & Leal, SM 2006, 'Novel sequence variants in the TMIE gene in families with autosomal recessive nonsyndromic hearing impairment', Journal of Molecular Medicine, vol. 84, no. 3, pp. 226-231. https://doi.org/10.1007/s00109-005-0015-3
Santos, Regie Lyn P ; El-Shanti, Hatem ; Sikandar, Shaheen ; Lee, Kwanghyuk ; Bhatti, Attya ; Yan, Kai ; Chahrour, Maria H. ; McArthur, Nathan ; Pham, Thanh L. ; Mahasneh, Amjad Abdullah ; Ahmad, Wasim ; Leal, Suzanne M. / Novel sequence variants in the TMIE gene in families with autosomal recessive nonsyndromic hearing impairment. In: Journal of Molecular Medicine. 2006 ; Vol. 84, No. 3. pp. 226-231.
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