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Title: The genome of the soybean cyst nematode (Heterodera glycines) reveals complex patterns of duplications involved in the evolution of parasitism genes

Abstract

Background: Heterodera glycines, commonly referred to as the soybean cyst nematode (SCN), is an obligatory and sedentary plant parasite that causes over a billion-dollar yield loss to soybean production annually. Although there are genetic determinants that render soybean plants resistant to certain nematode genotypes, resistant soybean cultivars are increasingly ineffective because their multi-year usage has selected for virulent H. glycines populations. The parasitic success of H. glycines relies on the comprehensive re-engineering of an infection site into a syncytium, as well as the long-term suppression of host defense to ensure syncytial viability. At the forefront of these complex molecular interactions are effectors, the proteins secreted by H. glycines into host root tissues. The mechanisms of effector acquisition, diversification, and selection need to be understood before effective control strategies can be developed, but the lack of an annotated genome has been a major roadblock. Results: Here, we use PacBio long-read technology to assemble a H. glycines genome of 738 contigs into 123 Mb with annotations for 29,769 genes. The genome contains significant numbers of repeats (34%), tandem duplicates (18.7 Mb), and horizontal gene transfer events (151 genes). A large number of putative effectors (431 genes) were identified in the genome, manymore » of which were found in transposons. Conclusions:This advance provides a glimpse into the host and parasite interplay by revealing a diversity of mechanisms that give rise to virulence genes in the soybean cyst nematode, including: tandem duplications containing over a fifth of the total gene count, virulence genes hitchhiking in transposons, and 107 horizontal gene transfers not reported in other plant parasitic nematodes thus far. Through extensive characterization of the H. glycines genome, we provide new insights into H. glycines biology and shed light onto the mystery underlying complex host-parasite interactions. This genome sequence is an important prerequisite to enable work towards generating new resistance or control measures against H. glycines.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1618564
Alternate Identifier(s):
OSTI ID: 1616080
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
BMC Genomics
Additional Journal Information:
Journal Name: BMC Genomics Journal Volume: 20 Journal Issue: 1; Journal ID: ISSN 1471-2164
Publisher:
Springer
Country of Publication:
United Kingdom
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Heterodera glycines; SCN; Soybean cyst nematode; Genome; Tandem duplication; Effector; Evolution

Citation Formats

Masonbrink, Rick, Maier, Tom R., Muppirala, Usha, Seetharam, Arun S., Lord, Etienne, Juvale, Parijat S., Schmutz, Jeremy, Johnson, Nathan T., Korkin, Dmitry, Mitchum, Melissa G., Mimee, Benjamin, den Akker, Sebastian Eves-van, Hudson, Matthew, Severin, Andrew J., and Baum, Thomas J. The genome of the soybean cyst nematode (Heterodera glycines) reveals complex patterns of duplications involved in the evolution of parasitism genes. United Kingdom: N. p., 2019. Web. doi:10.1186/s12864-019-5485-8.
Masonbrink, Rick, Maier, Tom R., Muppirala, Usha, Seetharam, Arun S., Lord, Etienne, Juvale, Parijat S., Schmutz, Jeremy, Johnson, Nathan T., Korkin, Dmitry, Mitchum, Melissa G., Mimee, Benjamin, den Akker, Sebastian Eves-van, Hudson, Matthew, Severin, Andrew J., & Baum, Thomas J. The genome of the soybean cyst nematode (Heterodera glycines) reveals complex patterns of duplications involved in the evolution of parasitism genes. United Kingdom. https://doi.org/10.1186/s12864-019-5485-8
Masonbrink, Rick, Maier, Tom R., Muppirala, Usha, Seetharam, Arun S., Lord, Etienne, Juvale, Parijat S., Schmutz, Jeremy, Johnson, Nathan T., Korkin, Dmitry, Mitchum, Melissa G., Mimee, Benjamin, den Akker, Sebastian Eves-van, Hudson, Matthew, Severin, Andrew J., and Baum, Thomas J. Thu . "The genome of the soybean cyst nematode (Heterodera glycines) reveals complex patterns of duplications involved in the evolution of parasitism genes". United Kingdom. https://doi.org/10.1186/s12864-019-5485-8.
@article{osti_1618564,
title = {The genome of the soybean cyst nematode (Heterodera glycines) reveals complex patterns of duplications involved in the evolution of parasitism genes},
author = {Masonbrink, Rick and Maier, Tom R. and Muppirala, Usha and Seetharam, Arun S. and Lord, Etienne and Juvale, Parijat S. and Schmutz, Jeremy and Johnson, Nathan T. and Korkin, Dmitry and Mitchum, Melissa G. and Mimee, Benjamin and den Akker, Sebastian Eves-van and Hudson, Matthew and Severin, Andrew J. and Baum, Thomas J.},
abstractNote = {Background: Heterodera glycines, commonly referred to as the soybean cyst nematode (SCN), is an obligatory and sedentary plant parasite that causes over a billion-dollar yield loss to soybean production annually. Although there are genetic determinants that render soybean plants resistant to certain nematode genotypes, resistant soybean cultivars are increasingly ineffective because their multi-year usage has selected for virulent H. glycines populations. The parasitic success of H. glycines relies on the comprehensive re-engineering of an infection site into a syncytium, as well as the long-term suppression of host defense to ensure syncytial viability. At the forefront of these complex molecular interactions are effectors, the proteins secreted by H. glycines into host root tissues. The mechanisms of effector acquisition, diversification, and selection need to be understood before effective control strategies can be developed, but the lack of an annotated genome has been a major roadblock. Results: Here, we use PacBio long-read technology to assemble a H. glycines genome of 738 contigs into 123 Mb with annotations for 29,769 genes. The genome contains significant numbers of repeats (34%), tandem duplicates (18.7 Mb), and horizontal gene transfer events (151 genes). A large number of putative effectors (431 genes) were identified in the genome, many of which were found in transposons. Conclusions:This advance provides a glimpse into the host and parasite interplay by revealing a diversity of mechanisms that give rise to virulence genes in the soybean cyst nematode, including: tandem duplications containing over a fifth of the total gene count, virulence genes hitchhiking in transposons, and 107 horizontal gene transfers not reported in other plant parasitic nematodes thus far. Through extensive characterization of the H. glycines genome, we provide new insights into H. glycines biology and shed light onto the mystery underlying complex host-parasite interactions. This genome sequence is an important prerequisite to enable work towards generating new resistance or control measures against H. glycines.},
doi = {10.1186/s12864-019-5485-8},
journal = {BMC Genomics},
number = 1,
volume = 20,
place = {United Kingdom},
year = {Thu Feb 07 00:00:00 EST 2019},
month = {Thu Feb 07 00:00:00 EST 2019}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1186/s12864-019-5485-8

Citation Metrics:
Cited by: 44 works
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Figures / Tables:

Fig. 1 Fig. 1: Phylogenetic relationships of species related to H. glycines. Phylogenetic tree of BUSCO genes with synteny representing the relatedness of each species. Synteny is inversely correlated with phylogenetic distance, as syntenic multiplicons decrease from hundreds in Globodera species, to zero in B. xylophilus, Green contigs denote H. glycines, whilemore » blue represent the respective related species. Node labels represent node ages. Pertinent comparative genome stats are found in the footer« less

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