A Complex Organization of the Gene Encoding Cytochrome Oxidase Subunit 1 in the Mitochondrial Genome of the Dinoflagellate, Crypthecodinium cohnii: ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2001-10

AUTHORS

John E. Norman, Michael W. Gray

ABSTRACT

In the course of investigating mitochondrial genome organization in Crypthecodinium cohnii, a non-photosynthetic dinoflagellate, we identified four EcoRI fragments that hybridize to a probe specific for cox1, the gene that encodes subunit 1 of cytochrome oxidase. Cloning and sequence characterization of the four fragments (5.7, 5.1, 4.1, 3.5 kilobase pairs) revealed that cox1 exists in four distinct but related contexts in C. cohnii mtDNA, with a central repeat unit flanked by one of two possible upstream (flanking domain 1 or 2) and downstream (flanking domain 3 or 4) regions. The majority of the cox1 gene is located within the central repeat; however, the C-terminal portion of the open reading frame extends into flanking domains 3 and 4, thereby creating two distinct cox1 coding sequences. The 3'-terminal region of one of the cox1 reading frames can assume an elaborate secondary structure, which potentially could act to stabilize the mature mRNA against nucleolytic degradation. In addition, a high density of small inverted repeats (15-22 base pairs) has been identified at the 5'-end of cox1, further suggesting that hairpin structures could be important for gene regulation. The organization of cox1 in C. cohnii mtDNA appears to reflect homologous recombination events within the central repeat between different cox1 sequence contexts. Such recombining repeats are a characteristic feature of plant (angiosperm) mtDNA, but they have not previously been described in the mitochondrial genomes of protists. More... »

PAGES

351-363

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002390010225

DOI

http://dx.doi.org/10.1007/s002390010225

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1045133037

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11675595


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