Dataset Information

The Phylogeography of Red Spiny Rats Maxomys surifer (Rodentia, Muridae) in Indochina with Comments on Taxonomy and Description of New Subspecies.

ABSTRACT: Alexander Evgenievich Balakirev, Alexei Vladimirovich Abramov, and Viatcheslav Vladimirovich Rozhnov (2017) The phylogeographic pattern of Maxomys surifer across most of its geographic range was investigated based on existing sequencing from GenBank and new original data from Vietnam to evaluate its natural subdivision and taxonomic structure in Indochina and neighboring regions. Seven major phylogenetic clusters/groups are apparent on the cytochrome b (Cyt b) and cytochrome ? oxydase subunit 1 gene (COI) trees, corresponding to geographical subpopulations of the species. Among them, distinct position of most divergent, clade Msur7 is also supported by analyses of nuclear (IRBP) gene. The taxonomic implication of these findings is tested by comparison of morphological features of this Northern (labeled by Msur7) and Southern Vietnamese populations widely distributed over the Indochina labeled by Msur3 mtDNA genetic marker. Direct comparisons of skulls measurements and multivariate analyses performed for these southern and northern populations showed that latter specimens are distinctive in being signi cantly larger in a number of cranial characters, with diagnostically smaller teeth relative to M. surifer from southern Vietnam, bearing also some traits in its external appearance, like relative tail length and coloration pattern. The pattern of genetic and cranial variation in M. surifer revealed in the present study suggests the existence of distinct genetic lineages and suspected longitudinal isolation, corresponding to morphologically distinctive forms. It is evident that at least some of these lineages merit subspecific status. We provide a taxonomical description elevating the northern Vietnamese populations to a new subspecies M. s. tonkinensis subsp. nov. We discuss the taxonomic implications, tentative range, and appropriate synonyms for all main genetic lineages over the range of M. surifer in the Sundaic region.

SUBMITTER: Evgenievich Balakirev A

PROVIDER: S-EPMC6517739 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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Publications

The Phylogeography of Red Spiny Rats Maxomys surifer (Rodentia, Muridae) in Indochina with Comments on Taxonomy and Description of New Subspecies.

Evgenievich Balakirev Alexander A Abramov Alexei Vladimirovich AV Rozhnov Viatcheslav Vladimirovich VV

Zoological studies 20170419

Alexander Evgenievich Balakirev, Alexei Vladimirovich Abramov, and Viatcheslav Vladimirovich Rozhnov (2017) The phylogeographic pattern of Maxomys surifer across most of its geographic range was investigated based on existing sequencing from GenBank and new original data from Vietnam to evaluate its natural subdivision and taxonomic structure in Indochina and neighboring regions. Seven major phylogenetic clusters/groups are apparent on the cytochrome b (Cyt b) and cyt ...[more]

PMID: 31966205

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Project description:BACKGROUND: Recent advances in comparative genomics have considerably improved our knowledge of the evolution of mammalian karyotype architecture. One of the breakthroughs was the preferential localization of evolutionary breakpoints in regions enriched in repetitive sequences (segmental duplications, telomeres and centromeres). In this context, we investigated the contribution of ribosomal genes to genome reshuffling since they are generally located in pericentromeric or subtelomeric regions, and form repeat clusters on different chromosomes. The target model was the genus Mus which exhibits a high rate of karyotypic change, a large fraction of which involves centromeres. RESULTS: The chromosomal distribution of rDNA clusters was determined by in situ hybridization of mouse probes in 19 species. Using a molecular-based reference tree, the phylogenetic distribution of clusters within the genus was reconstructed, and the temporal association between rDNA clusters, breakpoints and centromeres was tested by maximum likelihood analyses. Our results highlighted the following features of rDNA cluster dynamics in the genus Mus: i) rDNA clusters showed extensive diversity in number between species and an almost exclusive pericentromeric location, ii) a strong association between rDNA sites and centromeres was retrieved which may be related to their shared constraint of concerted evolution, iii) 24% of the observed breakpoints mapped near an rDNA cluster, and iv) a substantial rate of rDNA cluster change (insertion, deletion) also occurred in the absence of chromosomal rearrangements. CONCLUSIONS: This study on the dynamics of rDNA clusters within the genus Mus has revealed a strong evolutionary relationship between rDNA clusters and centromeres. Both of these genomic structures coincide with breakpoints in the genus Mus, suggesting that the accumulation of a large number of repeats in the centromeric region may contribute to the high level of chromosome repatterning observed in this group. However, the elevated rate of rDNA change observed in the chromosomally invariant clade indicates that the presence of these sequences is insufficient to lead to genome instability. In agreement with recent studies, these results suggest that additional factors such as modifications of the epigenetic state of DNA may be required to trigger evolutionary plasticity.

Dataset Information

The Phylogeography of Red Spiny Rats Maxomys surifer (Rodentia, Muridae) in Indochina with Comments on Taxonomy and Description of New Subspecies.

Publications

The Phylogeography of Red Spiny Rats <i>Maxomys surifer</i> (Rodentia, Muridae) in Indochina with Comments on Taxonomy and Description of New Subspecies.

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