Partial Sequence of the Mitochondrial Genome of Littorina saxatilis: Relevance to Gastropod Phylogenetics

Wilding, Craig S.; Mill, P. J.; Grahame, J.

doi:10.1007/pl00006479

Cited by 49 publications

(34 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2. lanes 15 to 18; lanes 26 to 29). This information agrees with those by Wilding et al (1999) who emphasize a high polymorphism rate in mollusks mitochondrial genome.…”

Section: Discussionsupporting

confidence: 92%

Polymerase chain reaction and restriction fragment length polymorphism of cytocrome oxidase subunit I used for differentiation of Brazilian Biomphalaria species intermediate host of Schistosoma mansoni

Vidigal

Montresor

Simpson³

et al. 2002

Mem. Inst. Oswaldo Cruz

View full text Add to dashboard Cite

“…2. lanes 15 to 18; lanes 26 to 29). This information agrees with those by Wilding et al (1999) who emphasize a high polymorphism rate in mollusks mitochondrial genome.…”

Section: Discussionsupporting

confidence: 92%

Polymerase chain reaction and restriction fragment length polymorphism of cytocrome oxidase subunit I used for differentiation of Brazilian Biomphalaria species intermediate host of Schistosoma mansoni

Vidigal

Montresor

Simpson³

et al. 2002

Mem. Inst. Oswaldo Cruz

View full text Add to dashboard Cite

“…1a), although both genes were transcribed in the same direction as in other taxa. This derived gene order has also evolved independently in other distantly related caenogastropods (17,18).…”

Section: Resultsmentioning

confidence: 87%

Changing identities: tRNA duplication and remolding within animal mitochondrial genomes

Rawlings

Collins

Bieler

2003

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Although the majority of metazoan mitochondrial genomes (mtDNAs) contain the same 37 genes, including 22 encoding transfer RNAs (tRNAs), the recognition of orthologs is not always straightforward. Here we demonstrate that inferring tRNA orthologs among taxa by using anticodon triplets and deduced secondary structure can be misleading: through a process of tRNA duplication and mutation in the anticodon triplet, remolded leucine (L UUR) tRNA genes have repeatedly taken over the role of isoaccepting LCUN leucine tRNAs within metazoan mtDNA. In the present work, data from within the gastropods and a broad survey of metazoan mtDNA suggest that tRNA leucine duplication and remolding events have occurred independently at least seven times within three major animal lineages. In all cases where the mechanism of gene remolding can be inferred with confidence, the direction is the same: from L UUR to LCUN. Gene remolding and its apparent asymmetry have significant implications for the use of mitochondrial tRNA gene orders as phylogenetic markers. Remolding complicates the identification of orthologs and can result in convergence in gene order. Careful sequence-based analysis of tRNAs can help to recognize this homoplasy, improving geneorder-based phylogenetic hypotheses and underscoring the importance of careful homology assessment. tRNA remolding also provides an additional mechanism by which gene order changes can occur within mtDNA: through the changing identity of tRNA genes themselves. Recognition of these remolding events can lead to new interpretations of gene order changes, as well as the discovery of phylogenetically relevant gene dynamics that are hidden at the level of gene order alone. Mitochondrial gene order data are being used with increasing frequency as robust molecular characters in deep-level metazoan phylogenetic studies. A fundamental assumption of molecular systematics is that orthologous genes can be recognized unambiguously. The facts that most animal mtDNAs described to date are composed of 37 genes (22 tRNAs, 2 rRNAs, and 13 protein subunits), that these genes play roles essential for oxidative metabolism, and that putative homologs have been identified in the mtDNAs of other eukaryotes (1, 2) suggest that identifying orthologs among metazoan lineages should not be problematic. In practice, however, establishing homology between mtDNA genes of distantly related organisms can be difficult at the nucleotide level because of high rates of sequence evolution. This difficulty in identifying homologs is particularly acute for short (Ϸ70-80 bp) tRNA genes. Typically, the anticodon and features of secondary structure are used to establish tRNA identity, but these can be misleading. Some tRNA genes may, through a process of duplication and point mutation(s) in the anticodon triplet, assume the identity of other tRNAs within mtDNA (3). The potential for gene remolding has been corroborated by in vitro tRNA gene knockout experiments in prokaryotic systems (4), and in studies of human mitochondrial-based dise...

show abstract

“…(A partial sequence of L. saxitalis has been published (Wilding et al, 1999). The gene arrangement in the neogastropods can be derived from that of the polyplacophoran species Katharina tunicata (Boore and Brown, 1994a) and the vetigastropoda species, Haliotis rubra (Maynard et al, 2005) mainly by two major rearrangements as described previously for L. cerithiformis (Bandyopadhyay et al, 2006).…”

Section: Comparison Of Gene Order In Mitochondrial Genomes Of Gastropmentioning

confidence: 89%

The mitochondrial genome of Conus textile, coxI–coxII intergenic sequences and Conoidean evolution

Bandyopadhyay

Stevenson

Ownby

et al. 2008

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

The cone snails belong to the superfamily Conoidea, comprising ∼10,000 venomous marine gastropods. We determined the complete mitochondrial DNA sequence of Conus textile. The gene order is identical in Conus textile, Lophiotoma cerithiformis (another Conoidean gastropod), and the neogastropod Ilyanassa obsoleta, (not in the superfamily Conoidea). However, the intergenic interval between the coxI/coxII genes, was much longer in C. textile (165 bp) than in any other previously analyzed gastropod.We used the intergenic region to evaluate evolutionary patterns. In most neogastropods and three conidean families the intergenic interval is small (<30 nucleotides). Within Conus, the variation is from 130-170 bp, and each different clade within Conus has a narrower size distribution. In Conasprella, a subgenus traditionally assigned to Conus, the intergenic regions vary between 200-500 bp, suggesting that the species in Conasprella are not congeneric with Conus. The intergenic region was used for phylogenetic analysis of a group of fish-hunting Conus, despite the short length resolution was better than using standard markers. Thus, the coxI/coxII intergenic region can be used both to define evolutionary relationships between species in a clade, and to understand broad evolutionary patterns across the large superfamily Conoidea.

show abstract

Partial Sequence of the Mitochondrial Genome of Littorina saxatilis: Relevance to Gastropod Phylogenetics

Cited by 49 publications

References 27 publications

Polymerase chain reaction and restriction fragment length polymorphism of cytocrome oxidase subunit I used for differentiation of Brazilian Biomphalaria species intermediate host of Schistosoma mansoni

Polymerase chain reaction and restriction fragment length polymorphism of cytocrome oxidase subunit I used for differentiation of Brazilian Biomphalaria species intermediate host of Schistosoma mansoni

Changing identities: tRNA duplication and remolding within animal mitochondrial genomes

The mitochondrial genome of Conus textile, coxI–coxII intergenic sequences and Conoidean evolution

Contact Info

Product

Resources

About