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Genetics, Vol 139, 873-887, Copyright © 1995
INVESTIGATIONS |
Complete Sequence of a Sea Lamprey (Petromyzon marinus) Mitochondrial Genome: Early Establishment of the Vertebrate Genome Organization
W. J. Lee and T. D. Kocher
Department of Zoology and Center for Marine Biology, University of New Hampshire, Durham, New Hampshire 03824
The complete nucleotide sequence of a sea lamprey (Petromyzon marinus) mitochondrial genome has been determined. The lamprey genome is 16,201 bp in length and contains genes for 13 proteins, two rRNAs, 22 tRNAs and two major noncoding regions. The order and transcriptional polarities of protein-coding genes are basically identical to those of other chordate mtDNAs, demonstrating that the common mitochondrial gene organization of vertebrates was established at an early stage of vertebrate evolution. The two major noncoding regions are separated by two tRNA genes. The first region probably functions as the control region because it contains distinctive conserved sequence blocks (CSB-II and III) common to other vertebrate control regions. The central conserved domain observed in other vertebrate control regions is not found in the lamprey, suggesting that it is a recently evolved functional domain in vertebrates. Noncoding segments are not found in the expected position of the origin of replication for the second strand, suggesting either that one of the tRNA genes has a dual function or that the second noncoding region may function as the second-strand origin. The base composition at the wobble positions of fourfold degenerate codon families is highly biased toward thymine (32.7%). Values of GC-and AT-skew are typical of vertebrate mitochondrial genomes.genomes.
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