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. 1995 Jul;57(1):77–86.

Pedigree analysis in Leber hereditary optic neuropathy families with a pathogenic mtDNA mutation.

A E Harding 1, M G Sweeney 1, G G Govan 1, P Riordan-Eva 1
PMCID: PMC1801226  PMID: 7611298

Abstract

Eighty-nine index patients from 85 families were defined as having Leber hereditary optic neuropathy (LHON) by the presence of one of the mtDNA mutations at positions 11778 (66 families), 3460 (8 families), or 14484 (11 families). There were 62 secondary cases. Overall, 64% of index cases had a history of similarly affected relatives. The ratios of affected males to affected females were 3.7:1 (11778), 4.3:1 (3460), and 7.7:1 (14484). The 95th centile for age at onset of symptoms was close to 50 years in index, secondary, male, and female patients. There were no differences in the distributions of age at onset between different mutation groups, between index and secondary cases, or between males and females, apart from this being slightly later in all female patients than in male 11778 patients. There was no significant correlation between age at onset in index cases and that in their affected siblings or cousins. Heteroplasmy (< 96% mutant mtDNA) was detected in 4% of affected subjects (67%-90% mutant mtDNA) and in 13.6% of 140 unaffected relatives (< 5%-90% mutant mtDNA). Analysis of all pedigrees, excluding sibships < 50 years of age and index cases, indicated recurrence risks of 30%, 8%, 46%, 10%, 31%, and 6%, respectively, to the brothers, sisters, nephews, nieces, and male and female matrilineal first cousins of index cases. Affected females were more likely to have affected children, particularly daughters, than were unaffected female carriers. The pedigree data were entirely compatible with the previously proposed X-linked susceptibility locus, with a gene frequency of .08, penetrance of .11 in heterozygous females, and 40% of affected females being homozygous, the remainder being explained by heterozygosity and disadvantageous X inactivation.

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Selected References

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