DOI: 10.1073/pnas.0502473102. Modular evolution of egg case silk genes across orb-weaving spider superfamilies

Modular evolution of egg case silk genes across orb-weaving spider superfamilies

10.1073/pnas.0502473102

Crossref journal-article

Proceedings of the National Academy of Sciences

Proceedings of the National Academy of Sciences (341)

Abstract

Spider silk proteins (fibroins) are renowned for their extraordinary mechanical properties and biomimetic potential. Despite extensive evolutionary, ecological, and industrial interest in these fibroins, only a fraction of the known silk types have been characterized at the molecular level. Here we report cDNA and genomic sequences of the fibroin TuSp1, which appears to be the major component of tubuliform gland silk, a fiber exclusively synthesized by female spiders for egg case construction. We obtainedTuSp1sequences from 12 spider species that represent the extremes of phylogenetic diversity within the Orbicularia (orb-weaver superfamilies, Araneoidea and Deinopoidea) and finer scale sampling within genera.TuSp1encodes tandem arrays of an ≈200-aa-long repeat unit and individual repeats are readily aligned, even among species that diverged >125 million years ago. Analyses of these repeats across species reveal the strong influence of concerted evolution, resulting in intragenic homogenization. However, deinopoidTuSp1repeats also contain insertions of coding, minisatellite-like sequences, an apparent result of replication slippage and nonreciprocal recombination. Phylogenetic analyses of 37 spider fibroin sequences support the monophyly ofTuSp1within the spider fibroin gene family, consistent with a single origin of this ortholog group. The diversity of taxa and silks examined here confirms that repetitive architecture is a general feature of this gene family. Moreover, we show thatTuSp1provides a clear example of modular evolution across a range of phylogenetic levels.

Bibliography

Garb, J. E., & Hayashi, C. Y. (2005). Modular evolution of egg case silk genes across orb-weaving spider superfamilies. Proceedings of the National Academy of Sciences, 102(32), 11379â11384.

Authors 2

Jessica E. Garb (first)
Cheryl Y. Hayashi (additional)

References 45 Referenced 103

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Dates

Type	When
Created	20 years, 1 month ago (Aug. 2, 2005, 3:45 a.m.)
Deposited	1 year, 7 months ago (Jan. 28, 2024, 6:26 a.m.)
Indexed	2 months, 1 week ago (June 26, 2025, 12:25 a.m.)
Issued	20 years, 1 month ago (Aug. 1, 2005)
Published	20 years, 1 month ago (Aug. 1, 2005)
Published Online	20 years, 1 month ago (Aug. 1, 2005)
Published Print	20 years ago (Aug. 9, 2005)

Funders 0

None

BibTeX

@article{Garb_2005, title={Modular evolution of egg case silk genes across orb-weaving spider superfamilies}, volume={102}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.0502473102}, DOI={10.1073/pnas.0502473102}, number={32}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Garb, Jessica E. and Hayashi, Cheryl Y.}, year={2005}, month=aug, pages={11379–11384} }

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