Plectus murrayi
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA438008 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| Other | ||||
| SRR14978270_1.fastq.gz | Fastqsanger.gz | |||
| SRR14978270_2.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 3 of 3 |
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Project description:Plectus murrayi Genome sequencing and assembly
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Project description:Plectus murrayi is a free-living microbivorous nematode endemic to Antarctic soils. Our draft assembly of its mitogenome was 15,656 bp long, containing 12 protein-coding, eight transfer RNA (tRNA), and two ribosomal RNA (rRNA) genes. Mitophylogenomic analyses extend our understanding of mitochondrial evolution in Nematoda.
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Project description:Plectus murrayi is one of the most common and locally abundant invertebrates of continental Antarctic ecosystems. Because it is readily cultured on artificial medium in the laboratory and highly tolerant to an extremely harsh environment, P. murrayi is emerging as a model organism for understanding the evolutionary origin and maintenance of adaptive responses to multiple environmental stressors, including freezing and desiccation. The de novo assembled genome of P. murrayi contains 225.741 million base pairs and a total of 14,689 predicted genes. Compared to Caenorhabditis elegans, the architectural components of P. murrayi are characterized by a lower number of protein-coding genes, fewer transposable elements, but more exons, than closely related taxa from less harsh environments. We compared the transcriptomes of lab-reared P. murrayi with wild-caught P. murrayi and found genes involved in growth and cellular processing were up-regulated in lab-cultured P. murrayi, while a few genes associated with cellular metabolism and freeze tolerance were expressed at relatively lower levels. Preliminary comparative genomic and transcriptomic analyses suggest that the observed constraints on P. murrayi genome architecture and functional gene expression, including genome decay and intron retention, may be an adaptive response to persisting in a biotically simplified, yet consistently physically harsh environment.
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Project description:We describe two new species, Entoloma. kermesinum sp. nov. and E. flavescens sp. nov., which are confused with E. quadratum and E. murrayi, respectively. We sequenced the large subunit of mitochondrial ribosomal RNA, the nuclear ribosomal internal transcribed spacer region and 22 single-copy genes for 51 specimens of E. kermesinum, E. flavescens, E. album, and related species. Species boundaries were assessed using the molecular phylogenetics and population genetics approaches. Specimens of E. kermesinum, E. flavescens, and E. album formed independent clades, which were phylogenetically distinct from the specimens of E. quadratum and E. murrayi collected around the type locality (i.e., New England). Although the phylogenetic distance between E. flavescens and E. album was small, gene flow between them was restricted in areas where they coexisted, suggesting reproductive isolation. Therefore, these five species can be treated as independent species. We found characteristics useful for identifying E. kermesinum and E. flavescens. In particular, E. kermesinum is characterized by a crimson to brown-red and fibrillose pileus, finely covered by whitish fibrous scales; E. flavescens is characterized by a lemon-yellow to tan and shiny-to-silky pileus. In addition, relatively large basidiospores and clamp connections are diagnostic features of these two species.
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