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Gene Review

cox1  -  cytochrome oxidase subunit 1

Chlamydomonas reinhardtii

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High impact information on cox1

  • A respiratory-deficient strain lacking a 1.2-kb mitochondrial DNA region including the left telomere and part of the cob gene could be rescued as well as a double-frameshift mutant in the mitochondrial cox1 and nd1 genes [1].
  • In the unicellular green alga, Chlamydomonas reinhardtii, cytochrome oxidase subunit 2 (cox2) and 3 (cox3) genes are missing from the mitochondrial genome [2].
  • Six group-I introns were found, two each in the cox1, cob, and nad5 genes [3].
  • In the dark- strain duM18, a + 1 T addition in a run of four Ts, located at codon 145 of the mitochondrial cox1 gene encoding subunit I of cytochrome c oxidase, is responsible for the mutant phenotype [4].
  • Suppression of a +1 T mutation by a nearby substitution in the mitochondrial cox1 gene of Chlamydomonas reinhardtii: a new type of frameshift suppression in an organelle genome [4].

Biological context of cox1

  • Two substitutions A1090G and A1098C (together called the m mutation) located in the conserved GTPase domain of the mitochondrial LSU rRNA gene were recently shown to weakly compensate for the phenotypical effect of a -1T frameshift mutation in the mitochondrial cox1 gene of C. reinhardtii [5].
  • A genetic and molecular analysis allowed us to demonstrate that the revertant phenotype is the consequence of two additional mutations that together act as a frameshift suppressor: an m mutation affecting a mitochondrial gene other than cox1 and an n mutation affecting a nuclear gene [6].


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