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Lake Baikal amphipods and their genomes, great and small.
Drozdova, P B; Madyarova, E V; Gurkov, A N; Saranchina, A E; Romanova, E V; Petunina, J V; Peretolchina, T E; Sherbakov, D Y; Timofeyev, M A.
Afiliación
  • Drozdova PB; Irkutsk State University, Irkutsk, Russia Baikal Research Centre, Irkutsk, Russia.
  • Madyarova EV; Irkutsk State University, Irkutsk, Russia.
  • Gurkov AN; Irkutsk State University, Irkutsk, Russia Baikal Research Centre, Irkutsk, Russia.
  • Saranchina AE; Irkutsk State University, Irkutsk, Russia.
  • Romanova EV; Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia.
  • Petunina JV; Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia.
  • Peretolchina TE; Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia.
  • Sherbakov DY; Irkutsk State University, Irkutsk, Russia Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia Novosibirsk State University, Novosibirsk, Russia.
  • Timofeyev MA; Irkutsk State University, Irkutsk, Russia.
Vavilovskii Zhurnal Genet Selektsii ; 28(3): 317-325, 2024 Jun.
Article en En | MEDLINE | ID: mdl-38952708
ABSTRACT
Endemic amphipods (Crustacea Amphipoda) of Lake Baikal represent an outstanding example of large species flocks occupying a wide range of ecological niches and originating from a handful of ancestor species. Their development took place at a restricted territory and is thus open for comprehensive research. Such examples provide unique opportunities for studying behavioral, anatomic, or physiological adaptations in multiple combinations of environmental conditions and thus attract considerable attention. The existing taxonomies of this group list over 350 species and subspecies, which, according to the molecular phylogenetic studies of marker genes, full transcriptomes and mitochondrial genomes, originated from at least two introductions into the lake. The studies of allozymes and marker genes have revealed a significant cryptic diversity in Baikal amphipods, as well as a large variance in genetic diversity within some morphological species. Crossing experiments conducted so far for two morphological species suggest that the differences in the mitochondrial marker (cytochrome c oxidase subunit I gene) can potentially be applied for making predictions about reproductive isolation. For about one-tenth of the Baikal amphipod species, nuclear genome sizes and chromosome numbers are known. While genome sizes vary within one order of magnitude, the karyotypes are relatively stable (2n = 52 for most species studied). Moreover, analysis of the diversity of repeated sequences in nuclear genomes showed significant between-species differences. Studies of mitochondrial genomes revealed some unusual features, such as variation in length and gene order, as well as duplications of tRNA genes, some of which also underwent remolding (change in anticodon specificity due to point mutations). The next important steps should be (i) the assembly of whole genomes for different species of Baikal amphipods, which is at the moment hampered by complicated genome structures with high repeat content, and (ii) updating species taxonomy taking into account all the data.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Vavilovskii Zhurnal Genet Selektsii Año: 2024 Tipo del documento: Article País de afiliación: Rusia Pais de publicación: Rusia
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Vavilovskii Zhurnal Genet Selektsii Año: 2024 Tipo del documento: Article País de afiliación: Rusia Pais de publicación: Rusia