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Whole‐mitogenome analysis unveils previously undescribed genetic diversity in cane toads across their invasion trajectory.

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Title: Whole‐mitogenome analysis unveils previously undescribed genetic diversity in cane toads across their invasion trajectory.
Authors: Cheung, Kelton1,2 (AUTHOR) kelton.cheung@unsw.edu.au, Amos, Timothy G.2,3 (AUTHOR), Shine, Rick4 (AUTHOR), DeVore, Jayna L.5 (AUTHOR), Ducatez, Simon6 (AUTHOR), Edwards, Richard J.2,7 (AUTHOR), Rollins, Lee Ann1 (AUTHOR)
Source: Ecology & Evolution (20457758). Mar2024, Vol. 14 Issue 3, p1-15. 15p.
Subject Terms: Genetic variation, Rhinella marina, Mitochondrial DNA, Genomics, NADH dehydrogenase
Geographic Terms: Australia
Abstract: Invasive species offer insights into rapid adaptation to novel environments. The iconic cane toad (Rhinella marina) is an excellent model for studying rapid adaptation during invasion. Previous research using the mitochondrial NADH dehydrogenase 3 (ND3) gene in Hawai'ian and Australian invasive populations found a single haplotype, indicating an extreme genetic bottleneck following introduction. Nuclear genetic diversity also exhibited reductions across the genome in these two populations. Here, we investigated the mitochondrial genomics of cane toads across this invasion trajectory. We created the first reference mitochondrial genome for this species using long‐read sequence data. We combined whole‐genome resequencing data of 15 toads with published transcriptomic data of 125 individuals to construct nearly complete mitochondrial genomes from the native (French Guiana) and introduced (Hawai'i and Australia) ranges for population genomic analyses. In agreement with previous investigations of these populations, we identified genetic bottlenecks in both Hawai'ian and Australian introduced populations, alongside evidence of population expansion in the invasive ranges. Although mitochondrial genetic diversity in introduced populations was reduced, our results revealed that it had been underestimated: we identified 45 mitochondrial haplotypes in Hawai'ian and Australian samples, none of which were found in the native range. Additionally, we identified two distinct groups of haplotypes from the native range, separated by a minimum of 110 base pairs (0.6%). These findings enhance our understanding of how invasion has shaped the genetic landscape of this species. [ABSTRACT FROM AUTHOR]
Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Whole‐mitogenome analysis unveils previously undescribed genetic diversity in cane toads across their invasion trajectory.
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  Data: <searchLink fieldCode="AR" term="%22Cheung%2C+Kelton%22">Cheung, Kelton</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> kelton.cheung@unsw.edu.au</i><br /><searchLink fieldCode="AR" term="%22Amos%2C+Timothy+G%2E%22">Amos, Timothy G.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shine%2C+Rick%22">Shine, Rick</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22DeVore%2C+Jayna+L%2E%22">DeVore, Jayna L.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ducatez%2C+Simon%22">Ducatez, Simon</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Edwards%2C+Richard+J%2E%22">Edwards, Richard J.</searchLink><relatesTo>2,7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rollins%2C+Lee+Ann%22">Rollins, Lee Ann</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. Mar2024, Vol. 14 Issue 3, p1-15. 15p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Genetic+variation%22">Genetic variation</searchLink><br /><searchLink fieldCode="DE" term="%22Rhinella+marina%22">Rhinella marina</searchLink><br /><searchLink fieldCode="DE" term="%22Mitochondrial+DNA%22">Mitochondrial DNA</searchLink><br /><searchLink fieldCode="DE" term="%22Genomics%22">Genomics</searchLink><br /><searchLink fieldCode="DE" term="%22NADH+dehydrogenase%22">NADH dehydrogenase</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Australia%22">Australia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Invasive species offer insights into rapid adaptation to novel environments. The iconic cane toad (Rhinella marina) is an excellent model for studying rapid adaptation during invasion. Previous research using the mitochondrial NADH dehydrogenase 3 (ND3) gene in Hawai'ian and Australian invasive populations found a single haplotype, indicating an extreme genetic bottleneck following introduction. Nuclear genetic diversity also exhibited reductions across the genome in these two populations. Here, we investigated the mitochondrial genomics of cane toads across this invasion trajectory. We created the first reference mitochondrial genome for this species using long‐read sequence data. We combined whole‐genome resequencing data of 15 toads with published transcriptomic data of 125 individuals to construct nearly complete mitochondrial genomes from the native (French Guiana) and introduced (Hawai'i and Australia) ranges for population genomic analyses. In agreement with previous investigations of these populations, we identified genetic bottlenecks in both Hawai'ian and Australian introduced populations, alongside evidence of population expansion in the invasive ranges. Although mitochondrial genetic diversity in introduced populations was reduced, our results revealed that it had been underestimated: we identified 45 mitochondrial haplotypes in Hawai'ian and Australian samples, none of which were found in the native range. Additionally, we identified two distinct groups of haplotypes from the native range, separated by a minimum of 110 base pairs (0.6%). These findings enhance our understanding of how invasion has shaped the genetic landscape of this species. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1002/ece3.11115
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      – Code: eng
        Text: English
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        PageCount: 15
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      – SubjectFull: Genetic variation
        Type: general
      – SubjectFull: Rhinella marina
        Type: general
      – SubjectFull: Mitochondrial DNA
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      – SubjectFull: Genomics
        Type: general
      – SubjectFull: NADH dehydrogenase
        Type: general
      – SubjectFull: Australia
        Type: general
    Titles:
      – TitleFull: Whole‐mitogenome analysis unveils previously undescribed genetic diversity in cane toads across their invasion trajectory.
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            NameFull: Cheung, Kelton
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            NameFull: Amos, Timothy G.
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            NameFull: Shine, Rick
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            NameFull: DeVore, Jayna L.
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            – D: 01
              M: 03
              Text: Mar2024
              Type: published
              Y: 2024
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              Value: 14
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