An autosomal locus predisposing to multiple deletions of mtDNA on chromosome 3p.

Abstract:

:Autosomal dominant progressive external ophthalmoplegia (adPEO) is a disorder characterized by ptosis, progressive weakness of the external eye muscles, and general muscle weakness. The patients have multiple deletions of mtDNA on Southern blots or in PCR analysis of muscle DNA and a mild deficiency of one or more respiratory-chain enzymes carrying mtDNA-encoded subunits. The pattern of inheritance indicates a nuclear gene defect predisposing to secondary mtDNA deletions. Recently, in one Finnish family, we assigned an adPEO locus to chromosome 10q 23.3-24.3 but also excluded linkage to this same locus in two Italian adPEO families with a phenotype closely resembling the Finnish one. We applied a random mapping approach to informative non-10q-linked Italian families to assign the second locus for adPEO and found strong evidence for linkage on chromosome 3p 14.1-21.2 in three Italian families, with a maximum two-point lod score of 4.62 at a recombination fraction of .0. However, in three additional families, linkage to the same chromosomal region was clearly absent, indicating further genetic complexity of the adPEO trait.

journal_name

Am J Hum Genet

authors

Kaukonen JA,Amati P,Suomalainen A,Rötig A,Piscaglia MG,Salvi F,Weissenbach J,Fratta G,Comi G,Peltonen L,Zeviani M

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

763-9

issue

4

eissn

0002-9297

issn

1537-6605

journal_volume

58

pub_type

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