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Collagen Sequence Analysis Reveals Evolutionary History of Extinct West Indies Nesophontes (Island-Shrews). | LitMetric

AI Article Synopsis

  • Ancient biomolecule analysis, particularly proteomic sequencing of collagen, offers new insights into evolutionary patterns and extinct species, extending our understanding beyond what ancient DNA can reveal.
  • The study focuses on the extinct Nesophontes lineage in the Caribbean, showing that they are closely related to Solenodon and highlighting evolutionary relationships that inform hypotheses about geographic isolation.
  • Findings indicate that Cuba has two distinct Nesophontes species with morphological variations, and newly reviewed evidence suggests the previously described Cayman Islands species is more closely related to one of those Cuban species than initially thought, enhancing our knowledge of historical biodiversity in the region.

Article Abstract

Ancient biomolecule analyses are proving increasingly useful in the study of evolutionary patterns, including extinct organisms. Proteomic sequencing techniques complement genomic approaches, having the potential to examine lineages further back in time than achievable using ancient DNA, given the less stringent preservation requirements. In this study, we demonstrate the ability to use collagen sequence analyses via proteomics to assist species delimitation as a foundation for informing evolutionary patterns. We uncover biogeographic information of an enigmatic and recently extinct lineage of Nesophontes across their range on the Caribbean islands. First, evolutionary relationships reconstructed from collagen sequences reaffirm the affinity of Nesophontes and Solenodon as sister taxa within Solenodonota. This relationship helps lay the foundation for testing geographical isolation hypotheses across islands within the Greater Antilles, including movement from Cuba toward Hispaniola. Second, our results are consistent with Cuba having just two species of Nesophontes (N. micrus and N. major) that exhibit intrapopulation morphological variation. Finally, analysis of the recently described species from the Cayman Islands (N. hemicingulus) indicates that it is a closer relative to N. major rather than N. micrus as previously speculated. This proteomic sequencing improves our understanding of the origin, evolution, and distribution of this extinct mammal lineage, particularly with respect to the approximate timing of speciation. Such knowledge is vital for this biodiversity hotspot, where the magnitude of recent extinctions may obscure true estimates of species richness in the past.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7530613PMC
http://dx.doi.org/10.1093/molbev/msaa137DOI Listing

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