Haplotype and phylogenetic analyses suggest that one European-specific mtDNA background plays a role in the expression of Leber hereditary optic neuropathy by increasing the penetrance of the primary mutations 11778 and 14484.

TitleHaplotype and phylogenetic analyses suggest that one European-specific mtDNA background plays a role in the expression of Leber hereditary optic neuropathy by increasing the penetrance of the primary mutations 11778 and 14484.
Publication TypeJournal Article
Year of Publication1997
AuthorsTorroni, A, Petrozzi, M, D'Urbano, L, Sellitto, D, Zeviani, M, Carrara, F, Carducci, C, Leuzzi, V, Carelli, V, Barboni, P, De Negri, A, Scozzari, R
JournalAm J Hum Genet
Volume60
Issue5
Pagination1107-21
Date Published1997 May
ISSN0002-9297
KeywordsDNA Primers, DNA, Mitochondrial, European Continental Ancestry Group, Gene Frequency, Genetic Testing, Haplotypes, Humans, Italy, Mutation, Optic Atrophies, Hereditary, Phylogeny, Polymerase Chain Reaction, Polymorphism, Genetic
Abstract

mtDNAs from 37 Italian subjects affected by Leber hereditary optic neuropathy (LHON) (28 were 11778 positive, 7 were 3460 positive, and 2 were 14484 positive) and from 99 Italian controls were screened for most of the mutations that currently are associated with LHON. High-resolution restriction-endonuclease analysis also was performed on all subjects, in order to define the phylogenetic relationships between the mtDNA haplotypes and the LHON mutations observed in patients and in controls. This analysis shows that the putative secondary/intermediate LHON mutations 4216, 4917, 13708, 15257, and 15812 are ancient polymorphisms, are associated in specific combinations, and define two common Caucasoid-specific haplotype groupings (haplogroups J and T). On the contrary, the same analysis shows that the primary mutations 11778, 3460, and 14484 are recent and are due to multiple mutational events. However, phylogenetic analysis also reveals a different evolutionary pattern for the three primary mutations. The 3460 mutations are distributed randomly along the phylogenetic trees, without any preferential association with the nine haplogroups (H, I, J, K, T, U, V, W, and X) that characterize European populations, whereas the 11778 and 14484 mutations show a strong preferential association with haplogroup J. This finding suggests that one ancient combination of haplogroup J-specific mutations increases both the penetrance of the two primary mutations 11778 and 14484 and the risk of disease expression.

Alternate JournalAm. J. Hum. Genet.
Citation Key1402
PubMed ID9150158
PubMed Central IDPMC1712418
Grant ListE.0069 / / Telethon / Italy