Abstract:
:Endonuclease G (endo G) is one of the most abundant nucleases in eukaryotic cells. It is encoded in the nucleus and imported to the mitochondrial intermembrane space. This nuclease is active on single- and double-stranded DNA. We genetically disrupted the endo G gene in mice without disturbing a conserved, overlapping gene of unknown function that is oriented tail to tail with the endo G gene. In these mice, the production of endo G protein is not detected, and the disruption abolishes the nuclease activity of endo G. The absence of endo G has no effect on mitochondrial DNA copy number, structure, or mutation rate over the first five generations. There is also no obvious effect on nuclear DNA degradation in standard apoptosis assays. The endo G null mice are viable and show no age-related or generational abnormalities anatomically or histologically. We infer that this highly conserved protein has no mitochondrial or apoptosis function that can discerned by the assays described here and that it may have a function yet to be determined. The early embryonic lethality of endo G null mice recently reported by others may be due to the disruption of the gene that overlaps the endo G gene.
journal_name
Mol Cell Bioljournal_title
Molecular and cellular biologyauthors
Irvine RA,Adachi N,Shibata DK,Cassell GD,Yu K,Karanjawala ZE,Hsieh CL,Lieber MRdoi
10.1128/MCB.25.1.294-302.2005subject
Has Abstractpub_date
2005-01-01 00:00:00pages
294-302issue
1eissn
0270-7306issn
1098-5549pii
25/1/294journal_volume
25pub_type
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