<abstract xmlns="http://www.w3.org/1999/xhtml">

<p><italic>Contracaecum</italic> species are zooparasitic anisakid nematodes and occur in gastrointestinal tracts of vertebrate/invertebrate animals, including humans, causing gastrointestinal pain, diarrhea, and increasingly severe vomiting. Although the complete mitochondrial (mt) genome (mitogenome) of <italic>Contracaecum</italic> sp. isolated from night herons in Beijing has been reported, the detailed information about this mt sequence is still puzzling. In the present study, we described the detailed characteristics across the complete mt DNA of <italic>Contracaecum</italic> sp., which includes 36 genes consisting of 12 protein genes, 22 transfer RNAs (tRNAs), 2 ribosomal RNAs (rRNAs), and 2 noncoding regions (NCRs), and all genes have the same orientation of transcription. The AT content in the complete mitogenome of <italic>Contracaecum</italic> sp. was 72.2%, and it was the least value (66.7%) in the <italic>cox</italic>1 gene but was the highest rate (84.1%) in NCRs. The highest nucleotide diversity (Pi) among the genus <italic>Contracaecum</italic> was <italic>nad</italic>4 (0.190) and the least was <italic>cox</italic>1 (0.125), which indicates that <italic>nad</italic>4 might have the potential ability as useful markers to detect cryptic species in the genus <italic>Contracaecum</italic> or subspecies. Based on the maximum likelihood (ML) and Bayesian inference (BI) computational algorithms within subfamilies Ascaridoidea and Heterakoidea, the results supported that <italic>Contracaecum</italic> sp. was a new species and the family Ascaridiidae was paraphyletic. The complete mitogenome sequence of <italic>Contracaecum</italic> sp. supported a clear recognition of <italic>Contracaecum</italic> species and provided the potential existence of cryptic species in the genus <italic>Contracaecum</italic>. Our findings would better contribute to the surveillance, molecular epidemiology, and control of <italic>Contracaecum</italic>.</p></abstract>

Contracaecum species are zooparasitic anisakid nematodes and occur in gastrointestinal tracts of vertebrate/invertebrate animals, including humans, causing gastrointestinal pain, diarrhea, and increasingly severe vomiting. Although the complete mitochondrial (mt) genome (mitogenome) of Contracaecum sp. isolated from night herons in Beijing has been reported, the detailed information about this mt sequence is still puzzling. In the present study, we described the detailed characteristics across the complete mt DNA of Contracaecum sp., which includes 36 genes consisting of 12 protein genes, 22 transfer RNAs (tRNAs), 2 ribosomal RNAs (rRNAs), and 2 noncoding regions (NCRs), and all genes have the same orientation of transcription. The AT content in the complete mitogenome of Contracaecum sp. was 72.2%, and it was the least value (66.7%) in the cox1 gene but was the highest rate (84.1%) in NCRs. The highest nucleotide diversity (Pi) among the genus Contracaecum was nad4 (0.190) and the least was cox1 (0.125), which indicates that nad4 might have the potential ability as useful markers to detect cryptic species in the genus Contracaecum or subspecies. Based on the maximum likelihood (ML) and Bayesian inference (BI) computational algorithms within subfamilies Ascaridoidea and Heterakoidea, the results supported that Contracaecum sp. was a new species and the family Ascaridiidae was paraphyletic. The complete mitogenome sequence of Contracaecum sp. supported a clear recognition of Contracaecum species and provided the potential existence of cryptic species in the genus Contracaecum. Our findings would better contribute to the surveillance, molecular epidemiology, and control of Contracaecum.

Complete Mitochondrial Genome of <italic>Contracaecum</italic> sp. (Nematoda: Ascarididae) from night herons in China

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Complete Mitochondrial Genome of  sp. (Nematoda: Ascarididae) from night herons in China

Contracaecum species are zooparasitic anisakid nematodes and occur in gastrointestinal tracts of vertebrate/invertebrate animals, including humans, causing...

Complete Mitochondrial Genome of Contracaecum sp. (Nematoda: Ascarididae) from night herons in China

Article Category: Research Note

Publié en ligne: 26 oct. 2022

Pages: -

Reçu: 03 mai 2022

DOI: https://doi.org/10.2478/jofnem-2022-0048

Mots clés
AT content, sp, mitochondrial genome, mitogenome

© 2022 Deng et al. published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Complete Mitochondrial Genome of Contracaecum sp. (Nematoda: Ascarididae) from night herons in China

Article Category: Research Note

Publié en ligne: 26 oct. 2022

Pages: -

Reçu: 03 mai 2022

DOI: https://doi.org/10.2478/jofnem-2022-0048

Mots clésAT content, sp, mitochondrial genome, mitogenome

© 2022 Deng et al. published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Mots clés
AT content, sp, mitochondrial genome, mitogenome