Abstract
The hydrothermal vent tubeworm Ridgeia piscesae relies on intracellular chemolithoautotrophic symbionts for its nutrition. Yet, little is known about symbiont diversity within and between individual worms. We report several lines of molecular evidence for multiple genotypes of very closely related symbionts within the trophosome of the R. piscesae. We examined the distribution of genotypic variants (insertions, deletions, and substitutions) in whole genome shotgun sequences of symbionts from the trophosome of a unique individual R. piscesae and the pooled sequences of five other tubeworms of the same species. Observed heterogeneity is unlikely to be the result of recent point or structural mutations of a monoclonal symbiont lineage. To assess inter-host diversity we examined single nucleotide polymorphisms (SNPs) in pyrosequences of the highly variable regions V1 to V3 of the symbiont 16S rRNA gene across 53 individual hosts from two vent sites. Most of the identified SNPs were found in more than one individual, and one seemed to be region specific. Two of the identified SNPs were also present in metagenomic data generated from high-throughput sequencing of trophosome material from an individual R. piscesae. Finally, we observed compositional and structural variations of CRISPR spacers within a CRISPR array.
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Acknowledgments
We thank Nathalie Forget for sharing her pyrosequences libraries. We also thank the crews of the R/V Atlantis and R/V Thomas G. Thompson, the pilots of the submersibles Alvin and the ROVs ROPOS and Millenium Plus, Carol Doya, and Steven Hallam for their assistance during sample collections and sequencing of the metagenomes. This research was enabled by computing assistance provided by Belaid Moa, WestGrid (westgrid.ca) and Compute Canada/Calcul Canada (computecanada.ca). We also thank the members of Verena Tunnicliffe’s lab, and all of the contributors to seqanswers.com and biostars.org.
This research was supported by a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant and a Canadian Healthy Oceans Network (NSERC Canada) to S.K.J.
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Fig. S.1
Variant calling pipelines for whole genome shotgun sequences and pyrosequences. See supplemental material and methods for details and references. (JPEG 141 kb)
Fig. S.2
Frequency spectrum of variants detected by VarScan and GATK with multiple ploidy parameters. (JPEG 41 kb)
Fig. S.3
Comparisons of variants detected by VarScan only or both VarScan and GATK; a) variant positions in the genome (inside or outside coding regions), b) types of substitution (transition vs transversion), c) substitution effects on amino acid sequence. (JPEG 50 kb)
Fig. S.4
Unassembled read pairs from the Symb_1 metagenome mapped onto the reference contig Ga0074115_104 (Ridgeia 1 symbiont). Only the portion of the contig containing the CRISPR array is visible. Read pairs with abnormally large insert sizes (1% percentile) are coloured in red. To help interpretation, a schematic representation of a deletion is presented in Box 1. (JPEG 107 kb)
Fig. S.5
Neighbor-joining tree based on the CRISPR sequences found in the symbiont metagenomes from 6 individual worms. The labels of the tree represent the names of the read sequence and are color coded by sample for clarity. Red: Ind11 (Symb_1); Grey: Ind10; Pink: Ind12; Green: Ind13; Blue: Ind14; Orange: Ind15. The symbiont metagenomes from Ind10, Ind12, Ind13 Ind14, and Ind15 were pooled together into Symb_pool. Spacers (SP) found in both Symb_1 and Symb_pool are represented outside the clades. See Table S. 3 for list of spacers. (JPEG 165 kb)
Table S 1
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Table S. 2
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Table S. 3
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Perez, M., Juniper, S. Is the trophosome of Ridgeia piscesae monoclonal?. Symbiosis 74, 55–65 (2018). https://doi.org/10.1007/s13199-017-0490-7
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DOI: https://doi.org/10.1007/s13199-017-0490-7