Using the methods of light microscopy, the histological structure of the spleen in Baikal seal (Pusica sibirica Gmel.) pups was studied for the first time. It was found that in Baikal seal the spleen is characterized by highly developed supporting elements (thick capsule and numerous branching trabeculae), which are rich in smooth myocytes. By the age of 2-4 weeks, all the structures of white pulp were formed, however, presence of only a few lymphoid nodules with the absent germinal centers indicates that functionally these structures are still immature. Presence of immature forms of granulocytic, erythroid and megakaryocytic lineage shows that the myelopoiesis in Baikal seal spleen continues in postnatal period.
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Whole-genome re-sequencing of the Baikal seal and other phocid seals for a glimpse into their genetic diversity, demographic history, and phylogeny.
GigaByte
November 2024
Institute for Ecology, Evolution and Diversity, Goethe University, Max-von-Laue-Strasse. 9, Frankfurt am Main, 60438, Germany.
Article Synopsis
- The Baikal seal, a freshwater seal unique to Lake Baikal, has a long history of being landlocked and is classified as a species of least concern due to its stable population despite its limited habitat.
- Recent research has expanded on genetic studies by sequencing the genomes of six Baikal seals alongside other seal species, enhancing our understanding of their evolutionary relationships.
- Findings indicate that the genetic diversity of the Baikal seal is comparable to that of other seals, prompting calls for further research on genomic diversity across its range.
Major Histocompatibility Complex Class II Genes Allele Diversity in Landlocked Seals.
J Hered
November 2024
A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow.
The allelic diversity of exon 2 (DQB gene) and exon 3 (DRB gene) of major histocompatibility complex class II was studied for the first time in two species of the landlocked pinnipeds, Baikal (N = 79) and Caspian (N = 32) seals, and these were in compared with the widespread Arctic species, the ringed seal (N = 13). The analysis of the second exon comprising the antigen-binding region revealed high allelic diversity in all three species but the pattern of the diversity was the most specific for the Baikal seal. This species differs from the other two by the smallest number of alleles in the population, yet they have the largest number of alleles per individual and by the maximum similarity of individual genotypes.
View Article and Find Full Text PDFPopulation genomics of seal lice provides insights into the postglacial history of northern European seals.
Mol Ecol
October 2024
Department of Ecosystems in the Barents Region, Svanhovd Research Station, Norwegian Institute of Bioeconomy Research, Svanvik, Norway.
Article Synopsis
- Genetic analyses of seal lice were conducted to explore the evolutionary history of seal populations in the Arctic Ocean and the Baltic Sea, particularly focusing on unique landlocked ringed seal populations in lakes Saimaa and Ladoga.
- The study found that lice and their seal hosts have distinct genetic profiles reflecting postglacial divergence and geological changes, indicating a correlation between louse population sizes and their seal host populations.
- Significantly, ancient gene flow between the lice from Baltic gray seals and ringed seals suggests that these populations had greater interactions in the past, highlighting how analyzing parasites can reveal intricate population dynamics of their animal hosts.
Genetic Characteristics of the Baikal Seal Pusa sibirica Population.
Dokl Biol Sci
August 2023
Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia.
Article Synopsis
- - The study examined the genetic variation in two mitochondrial DNA (mtDNA) regions, specifically the cytochrome b gene and the control region, in Baikal seals (Pusa sibirica).
- - Researchers used multiple samples collected over different locations and times to analyze this genetic diversity for the first time in this species.
- - The findings indicate that the Baikal seal population is relatively new in evolutionary terms and is currently experiencing a growth in numbers.
In silico simulations and molecular descriptors to predict in vitro transactivation potencies of Baikal seal estrogen receptors by environmental contaminants.
Ecotoxicol Environ Saf
October 2023
Center for Marine Environmental Studies, Ehime University, Matsuyama 7908577, Japan. Electronic address:
Baikal seals (Pusa sibirica) are vulnerable to high levels of organic pollutants. Here, we evaluated the transactivation potencies of bisphenols (BPs) and hydroxylated polychlorinated biphenyls (OH-PCBs) via the Baikal seal estrogen receptor α and β (bsERα and bsERβ) using in vitro and in silico approaches. In vitro reporter gene assays showed that most BPs and OH-PCBs exhibited estrogenic activity with bsER sub-type-specific potency.
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