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Dev Dyn. 2021 Jun;250(6):822-837. doi: 10.1002/dvdy.257. Epub 2020 Oct 14.

Large-scale variation in single nucleotide polymorphism density within the laboratory axolotl (Ambystoma mexicanum).

Developmental dynamics : an official publication of the American Association of Anatomists

Nataliya Timoshevskaya, S Randal Voss, Caitlin N Labianca, Cassity R High, Jeramiah J Smith

Affiliations

  1. Department of Biology, University of Kentucky, Lexington, Kentucky, USA.
  2. Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, Kentucky, USA.
  3. Department of Neuroscience, University of Kentucky, Lexington, Kentucky, USA.
  4. Ambystoma Genetic Stock Center, University of Kentucky, Lexington, Kentucky, USA.
  5. Paul Laurence Dunbar High School, Lexington, Kentucky, USA.
  6. Current Affiliation: Department of Biology, University of Rochester, Rochester, New York, USA.

PMID: 33001517 PMCID: PMC8715502 DOI: 10.1002/dvdy.257

Abstract

BACKGROUND: Recent efforts to assemble and analyze the Ambystoma mexicanum genome have dramatically improved the potential to develop molecular tools and pursue genome-wide analyses of genetic variation.

RESULTS: To better resolve the distribution and origins of genetic variation with A mexicanum, we compared DNA sequence data for two laboratory A mexicanum and one A tigrinum to identify 702 million high confidence polymorphisms distributed across the 32 Gb genome. While the wild-caught A tigrinum was generally more polymorphic in a genome-wide sense, several multi-megabase regions were identified from A mexicanum genomes that were actually more polymorphic than A tigrinum. Analysis of polymorphism and repeat content reveals that these regions likely originated from the intentional hybridization of A mexicanum and A tigrinum that was used to introduce the albino mutation into laboratory stocks.

CONCLUSIONS: Our findings show that axolotl genomes are variable with respect to introgressed DNA from a highly polymorphic species. It seems likely that other divergent regions will be discovered with additional sequencing of A mexicanum. This has practical implications for designing molecular probes and suggests a need to study A mexicanum phenotypic variation and genome evolution across the tiger salamander clade.

© 2020 Wiley Periodicals LLC.

Keywords: SNPs; axolotl; genome; hybrid; salamander

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