NDLI: Complete Mitochondrial DNA Sequence of the Eastern Oyster Crassostrea virginica

Content Provider	Springer Nature Link
Author	Milbury, Coren A. Gaffney, Patrick M.
Copyright Year	2005
Abstract	The complete mitochondrial genome of the eastern oyster Crassostrea virginica (GenBank accession number AY905542) is 17,243 bp in length and contains 2 ribosomal genes, 12 protein-coding genes, and 23 transfer RNAs. The arrangement of protein-coding genes is identical to that of the congeneric Pacific oyster C. gigas, but tRNA genes show several duplications and extensive rearrangements between the species. Unique features in C. virginica include an additional trnM gene, the absence of an ATPase subunit 8 (atp8) gene, and an inferred translational frameshift within the cytochrome b (cob) gene. In both species the large subunit ribosomal RNA gene is encoded by 2 separate regions of the mitochondrial genome, the first reported case of a split ribosomal RNA gene in a metazoan. Translation of protein-coding genes in both species is initiated with methionine, with the exception of cob, which uses leucine. In C. virginica translation of all protein-coding genes (except possibly cob) terminates with TAA, with polyadenylation completing the primary transcript in cytochrome oxidase subunit III (cox3) and NADH dehydrogenase subunit 4L (nad4L), whereas C. gigas employs stop codons TAA and TAG equally. Interspecific divergence of mitochondrially encoded proteins is considerable, with amino acid identities ranging from 47% to 92%. A single major noncoding region representing the putative control region is found in both species.
Starting Page	697
Ending Page	712
Page Count	16
File Format	PDF
ISSN	14362228
Journal	Marine Biotechnology
Volume Number	7
Issue Number	6
e-ISSN	14362236
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-08-23
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crassostrea virginica Crassostrea gigas mitochondrial genome translational frameshift split rRNA gene Oceanography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Biotechnology

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