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Genome-wide Snapshot of Chromatin Regulators and States in Xenopus Embryos by ChIP-Seq
Published on: February 26, 2015
Next generation sequencing and comparative analyses of Xenopus mitogenomes
Rhiannon E Lloyd1, Peter G Foster, Matthew Guille
1Julius L. Chambers Biomedical/ Biotechnology Research Institute & Department of Chemistry, North Carolina Central University, 1801 Fayetteville Street, Durham, NC 27707, USA
BMC Genomics
|September 21, 2012
Summary
Researchers developed efficient methods to sequence amphibian mitochondrial genomes using long-PCR and next-generation sequencing. These new mitochondrial DNA sequences aid in species identification and phylogenetic analysis, crucial for amphibian conservation efforts.
Area of Science:
- Genomics
- Molecular Biology
- Evolutionary Biology
Background:
- Mitochondrial genomes encode essential proteins for cellular respiration.
- Mitochondrial DNA sequences are valuable markers for systematics, molecular ecology, and forensics.
- Efficient methods for complete mitochondrial genome amplification from limited tissue are needed.
Purpose of the Study:
- To validate two novel approaches combining long-PCR and Roche 454 pyrosequencing for complete mitochondrial genome characterization.
- To obtain complete mitochondrial genome sequences for two new Xenopus frog species.
- To compare newly sequenced mitogenomes with related species to understand evolutionary relationships and genetic diversity.
Main Methods:
- Utilized long-polymerase chain reaction (long-PCR) combined with Roche 454 pyrosequencing.
- Applied two strategies: sequencing individual genomes or multiple pooled genomes.
- Compared newly generated mitochondrial genome data with existing sequences from closely related species.
Main Results:
- Successfully obtained complete mitochondrial genome sequences for Xenopus borealis and X. victorianus.
- Achieved high depths of coverage, surpassing traditional primer-walking methods, at a comparable or lower cost.
- Identified conserved gene content and order within Xenopus mitogenomes, with Silurana tropicalis forming a distinct clade. Demonstrated varying nucleotide and amino acid diversity across genes, with protein-coding genes under strong purifying selection.
Conclusions:
- Next-generation sequencing of long-PCR amplicons provides an effective method for characterizing amphibian mitochondrial DNA.
- These methods will aid in identifying markers for species differentiation and resolving amphibian phylogenies, supporting conservation efforts.
- The generated mitochondrial genome data can serve as templates for primer design and analysis of high-throughput 'omic' data, advancing research in mitochondrial replication and gene expression.
