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Stenopsyche tienmushanensis

ABSTRACT: Stenopsyche tienmushanensis overview

PROVIDER: PRJNA765084 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR7062460_1.fastq.gz	Fastqsanger.gz
	SRR7062460_2.fastq.gz	Fastqsanger.gz
	SRR7062470_subreads.fastq.gz	Fastqsanger.gz
	SRR7062461_subreads.fastq.gz	Fastqsanger.gz

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Stenopsyche angustata

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Stenopsyche tienmushanensis

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Complete mitochondrial genome of <i>Stenopsyche tienmushanensis</i> (Trichoptera: Stenopsychidae).

Project description:The complete mitochondrial genome (mitogenome) of Stenopsyche tienmushanensis Hwang, 1957 was assembled from Illumina high-throughput sequencing data. The circularized mitogenome has a length of 16,049 bp with a high A + T content of 77.9%, including 13 protein-coding genes (PCGs), 22 tRNA genes, and 2 rRNA genes. Its gene composition and order were the same as Stenopsyche angustata. The overall base composition is 42.0% for A, 35.9% for T, 7.6% for C, and 14.5% for G. A phylogenetic analysis based on 13 PCGs of S. tienmushanensis and 20 other caddisflies supports the placement of Stenopsychidae as sister to the Hydropsychidae within Trichoptera.

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Project description:The 1KITE project: evolution of insects

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The genome of an underwater architect, the caddisfly Stenopsyche tienmushanensis Hwang (Insecta: Trichoptera).

Project description:Caddisflies (Insecta: Trichoptera) are a highly adapted freshwater group of insects split from a common ancestor with Lepidoptera. They are the most diverse (>16,000 species) of the strictly aquatic insect orders and are widely employed as bio-indicators in water quality assessment and monitoring. Among the numerous adaptations to aquatic habitats, caddisfly larvae use silk and materials from the environment (e.g., stones, sticks, leaf matter) to build composite structures such as fixed retreats and portable cases. Understanding how caddisflies have adapted to aquatic habitats will help explain the evolution and subsequent diversification of the group. We sequenced a retreat-builder caddisfly Stenopsyche tienmushanensis Hwang and assembled a high-quality genome from both Illumina and Pacific Biosciences (PacBio) sequencing. In total, 601.2 M Illumina reads (90.2 Gb) and 16.9 M PacBio subreads (89.0 Gb) were generated. The 451.5 Mb assembled genome has a contig N50 of 1.29 M, has a longest contig of 4.76 Mb, and covers 97.65% of the 1,658 insect single-copy genes as assessed by Benchmarking Universal Single-Copy Orthologs. The genome comprises 36.76% repetitive elements. A total of 14,672 predicted protein-coding genes were identified. The genome revealed gene expansions in specific groups of the cytochrome P450 family and olfactory binding proteins, suggesting potential genomic features associated with pollutant tolerance and mate finding. In addition, the complete gene complex of the highly repetitive H-fibroin, the major protein component of caddisfly larval silk, was assembled. We report the draft genome of Stenopsyche tienmushanensis, the highest-quality caddisfly genome so far. The genome information will be an important resource for the study of caddisflies and may shed light on the evolution of aquatic insects.

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The silk gland proteome of Stenopsyche angustata provides insights into the underwater silk secretion

Project description:Caddisworms (Trichoptera) spin adhesive silks to construct a variety of underwater composite structures. Many studies have focused on the fibroin heavy chain of caddisworm silk and found that it contains heavy phosphorylation to maintain a stable secondary structure. Besides fibroins, recent studies have also identified some new silk proteins within caddisworm silk. To better understand the silk composition and its secretion process, this study reports the silk gland proteome of a retreat-building caddisworm, Stenopsyche angustata. Using LC-MS/MS, 2389 proteins were identified in the silk gland of S. angustata, among which 192 were predicted as secreted silk proteins. Twenty-nine proteins were found to be enriched in the front silk gland, while 109 proteins were enriched in the caudal silk gland. The fibroin heavy chain and nine uncharacterized silk proteins were identified as phosphorylated proteins. By analyzing the sequence of the fibroin heavy chain, we found it contains 13 Gly/Thr/Pro-rich regions, 12 Val/Ser/Arg-rich regions, and a Gly/Arg/Thr-rich region. Three uncharacterized proteins were identified as sericin-like proteins due to having larger molecular weights, signal peptides, and repetitive motifs rich in serine. This study provides valuable information for further clarifying the secretion and adhesion of underwater caddisworm silk.

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