Journal
CURRENT GENETICS
Volume 50, Issue 3, Pages 173-182Publisher
SPRINGER
DOI: 10.1007/s00294-006-0087-9
Keywords
mitochondria; nucleoids; yeast; membrane protein; organelle; mitochondrial DNA escape
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Funding
- NIGMS NIH HHS [GM047390] Funding Source: Medline
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A large number of gene products have been identified that either directly or indirectly alter the inheritance of mitochondrial DNA. In yeast, we have used a unique genetic screen based on the transfer of DNA from mitochondria to nucleus to identify nuclear-encoded gene products that are targeted to mitochondria and impact the stable inheritance of mitochondrial DNA. A specific allele of one of these genes, yme2-4, prevents even the low wild-type rate of mitochondrial DNA transfer to the nucleus and imparts significant temperature-sensitive and respiratory-growth defects. Intra- and extragenic suppressors of the yme2-4 growth phenotypes were isolated and analysis of these interacting genes reveals that both YME2 and its suppressors influence the structure and number of mitochondrial nucleoids. The yme2-4 allele decreases the average number of mtDNA nucleoids found in cells and the sensitivity of DNA in toluene-treated mitochondria to digestion by DNA exonuclease, effects reversed by intra- and extragenic suppressors. The extragenic suppressor, a missense allele of ILV5, encodes an enzyme of the branched-chain amino acid biosynthetic pathway that is also a component of mitochondrial nucleoids. A null allele of ILV5 suppresses transfer of mitochondrial DNA to the nucleus and displays synthetic interactions with yme2-4.
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