Haplogroup analysis supports a pathogenic role for the 7510T>C mutation of mitochondrial tRNA(Ser(UCN)) in sensorineural hearing loss.

Abstract

We ascertained a large North American family, LMG309, with matrilineal transmission of non-syndromic, progressive sensorineural hearing loss (SNHL). There was no history of aminoglycoside exposure, and penetrance was complete. We sequenced the entire mitochondrial genome and identified the previously reported 7510T>C transition in the tRNA(Ser(UCN)) gene. The 7510T>C was homoplasmic in all affected members. The LMG309 mitochondrial sequence belongs to an unnamed subgroup of mitochondrial haplogroup H. We demonstrate that the previously reported Spanish family S258 carries 7510T>C on a different mitochondrial sub-haplogroup, H1. We did not detect 7510T>C among 79 Caucasian haplogroup H control samples, including 11 from sub-haplogroup H1 and one from the same sub-haplogroup as LMG309. Our results provide strong genetic evidence that 7510T>C is a pathogenic mutation that causes non-syndromic SNHL.

• Authors: V Labay, G Garrido, A C Madeo, W E Nance, T B Friedman, P L Friedman, I Del Castillo, A J Griffith
• Journal: Clinical genetics (Clin Genet) Vol. 73 Issue 1 Pg. 50-4 (Jan 2008) ISSN: 1399-0004 [Electronic] Denmark
• PMID: 18028453 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, N.I.H., Intramural, Research Support, Non-U.S. Gov't)

Chemical References

• DNA, Mitochondrial
• RNA, Transfer, Ser

Topics

• DNA, Mitochondrial (genetics)
• Family Health
• Genome, Mitochondrial
• Haplotypes
• Hearing Loss, Sensorineural (genetics)
• North America
• Pedigree
• Point Mutation
• RNA, Transfer, Ser (genetics)