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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1996 Feb;58(2):325–334.

Longitudinal study of a heteroplasmic 3460 Leber hereditary optic neuropathy family by multiplexed primer-extension analysis and nucleotide sequencing.

S S Ghosh 1, E Fahy 1, I Bodis-Wollner 1, J Sherman 1, N Howell 1
PMCID: PMC1914528  PMID: 8571959

Abstract

Nucleotide-sequencing and multiplexed primer-extension assays have been used to quantitate the mutant-allele frequency in 14 maternal relatives, spanning three generations, from a family that is heteroplasmic for the primary Leber hereditary optic neuropathy (LHON) mutation at nucleotide 3460 of the mitochondrial genome. There was excellent agreement between the values that were obtained with the two different methods. The longitudinal study shows that the mutant-allele frequency was constant within individual family members over a sampling period of 3.5 years. Second, although there was an overall increase in the mutant-allele frequency in successive generations, segregation in the direction of the mutant allele was not invariant, and there was one instance in which there was a significant decrease in the frequency from parent to offspring. From these two sets of results, and from previous studies of heteroplasmic LHON families, we conclude that there is no evidence for a marked selective pressure that determines the replication, segregation, or transmission of primary LHON mutations to white blood cells and platelets. Instead, the mtDNA molecules are most likely to replicate and segregate under conditions of random drift at the cellular level. Finally, the pattern of transmission in this maternal lineage is compatible with a developmental bottleneck model in which the number of mitochondrial units of segregation in the female germ line is relatively small in relation to the number of mtDNA molecules within a cell. However, this is not an invariant pattern for humans, and simple models of mitochondrial gene transmission are inappropriate at the present time.

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Selected References

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