Macronuclear genome of Blepharisma japonicum R1702
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB46921 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR6473251_1.fastq.gz | Fastqsanger.gz | |||
| ERR6473251_2.fastq.gz | Fastqsanger.gz | |||
| ERR6474383.fastq.gz | Fastqsanger.gz | |||
| ERR6474356_1.fastq.gz | Fastqsanger.gz | |||
| ERR6474356_2.fastq.gz | Fastqsanger.gz |
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Project description:Chinese and Philippine strains of the blood fluke Schistosoma japonicum present clear and distinctive phenotypes in areas of fecundity, pathology, drug sensitivity and immunology. Despite these differences large scale sequencing efforts have focused solely on Chinese mainland strain of the parasite. We have undertaken a comparative genomic hybridisation (CGH) approach to highlight some of the structural differences in the genome of two of the major geographical isolates of S. japonicum. We identified seven distinct regions of the S. japonicum genome that present differential CGH between Chinese and Philippine strains of the blood fluke Schistosoma japonicum, representing either deletion or duplication regions in the Philippine strain. Within these regions, genes that may be related to phenotypical differences are identified and discussed.
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Project description:Background: Schistosoma japonicum is a pathogen of the phylum Platyhelminths that causes zoonotic schistosomiasis endemic in China and Southeast Asian countries. Control of the disease has been hampered by the lack of efficient measures. The development of tools for diagnosis of acute and chronic infection, and novel antiparasite reagents all relies on the understanding of the biological mechanism of the parasite. Results: In this study, the polyadenylated transcripts from the male and female S. japonicum were sequenced by a high-through-put RNA-seq technique. Bioinformatic and experimental analyses were focused on the posttranscriptional RNA processing, which at the first time revealed the extensive alternative splicing events occurred in the adult stage of the parasite. The number of protein-coding sequences identified in the transcriptomes of the female and male S. japonicum was 15,939 and 19,501 respectively, which is more than that predicted from the annotated genome sequence. Further, we identified four types of posttranscriptional processing, also called alternative splicing, in both female and male worms of S. japonicum, including exon skipping, intron retention, alternative donor site, and alternative acceptor site. Unlike mammalian organisms, alternative donor site and alternative acceptor site were found to be more common than the other two types of posttranscriptional processing in S. japonicum. In total, 13,438 and 16,507 alternative splicing events were respectively predicted in the transcriptomes of female and male S. japonicum. Conclusions: By using RNA-seq technology, we obtained the global transcriptomes of male and female S. japonicum. These results further provide a comprehensive view of the global transcriptome of S. japonicum. The findings of a substantial level of alternative splicing events dynamically occurring in the parasitation of the S. japonicum in the mammalian hosts suggested a complicate transcriptional and post-transcriptional regulation mechanisms employed by the parasite. The data will not only significantly improve the re-annotation of the genome sequences, but will also provide new information in the biology of the parasite.
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