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Title: Pleiotropic and Epistatic Network-Based Discovery: Integrated Networks for Target Gene Discovery

Abstract

Biological organisms are complex systems that are composed of functional networks of interacting molecules and macro-molecules. Complex phenotypes are the result of orchestrated, hierarchical, heterogeneous collections of expressed genomic variants. However, the effects of these variants are the result of historic selective pressure and current environmental and epigenetic signals, and, as such, their co-occurrence can be seen as genome-wide correlations in a number of different manners. Biomass recalcitrance (i.e., the resistance of plants to degradation or deconstruction, which ultimately enables access to a plant's sugars) is a complex polygenic phenotype of high importance to biofuels initiatives. This study makes use of data derived from the re-sequenced genomes from over 800 different Populus trichocarpa genotypes in combination with metabolomic and pyMBMS data across this population, as well as co-expression and co-methylation networks in order to better understand the molecular interactions involved in recalcitrance, and identify target genes involved in lignin biosynthesis/degradation. A Lines Of Evidence (LOE) scoring system is developed to integrate the information in the different layers and quantify the number of lines of evidence linking genes to target functions. This new scoring system was applied to quantify the lines of evidence linking genes to lignin-related genes and phenotypes acrossmore » the network layers, and allowed for the generation of new hypotheses surrounding potential new candidate genes involved in lignin biosynthesis in P. trichocarpa, including various AGAMOUS-LIKE genes. Lastly, the resulting Genome Wide Association Study networks, integrated with Single Nucleotide Polymorphism (SNP) correlation, co-methylation, and co-expression networks through the LOE scores are proving to be a powerful approach to determine the pleiotropic and epistatic relationships underlying cellular functions and, as such, the molecular basis for complex phenotypes, such as recalcitrance.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); National Renewable Energy Laboratory (NREL), Golden, CO (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1436886
Alternate Identifier(s):
OSTI ID: 1454749; OSTI ID: 1471945; OSTI ID: 1615272
Report Number(s):
NREL/JA-5100-71744
Journal ID: ISSN 2296-598X; 30
Grant/Contract Number:  
AC02-05CH11231; AC36-08GO28308; AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Frontiers in Energy Research
Additional Journal Information:
Journal Name: Frontiers in Energy Research Journal Volume: 6; Journal ID: ISSN 2296-598X
Publisher:
Frontiers Research Foundation
Country of Publication:
Switzerland
Language:
English
Subject:
09 BIOMASS FUELS; multi-omic data layering; LOE scores; lines of evidence; GWAS; SNP correlation; association networks

Citation Formats

Weighill, Deborah, Jones, Piet, Shah, Manesh, Ranjan, Priya, Muchero, Wellington, Schmutz, Jeremy, Sreedasyam, Avinash, Macaya-Sanz, David, Sykes, Robert, Zhao, Nan, Martin, Madhavi Z., DiFazio, Stephen, Tschaplinski, Timothy J., Tuskan, Gerald, and Jacobson, Daniel. Pleiotropic and Epistatic Network-Based Discovery: Integrated Networks for Target Gene Discovery. Switzerland: N. p., 2018. Web. doi:10.3389/fenrg.2018.00030.
Weighill, Deborah, Jones, Piet, Shah, Manesh, Ranjan, Priya, Muchero, Wellington, Schmutz, Jeremy, Sreedasyam, Avinash, Macaya-Sanz, David, Sykes, Robert, Zhao, Nan, Martin, Madhavi Z., DiFazio, Stephen, Tschaplinski, Timothy J., Tuskan, Gerald, & Jacobson, Daniel. Pleiotropic and Epistatic Network-Based Discovery: Integrated Networks for Target Gene Discovery. Switzerland. https://doi.org/10.3389/fenrg.2018.00030
Weighill, Deborah, Jones, Piet, Shah, Manesh, Ranjan, Priya, Muchero, Wellington, Schmutz, Jeremy, Sreedasyam, Avinash, Macaya-Sanz, David, Sykes, Robert, Zhao, Nan, Martin, Madhavi Z., DiFazio, Stephen, Tschaplinski, Timothy J., Tuskan, Gerald, and Jacobson, Daniel. Fri . "Pleiotropic and Epistatic Network-Based Discovery: Integrated Networks for Target Gene Discovery". Switzerland. https://doi.org/10.3389/fenrg.2018.00030.
@article{osti_1436886,
title = {Pleiotropic and Epistatic Network-Based Discovery: Integrated Networks for Target Gene Discovery},
author = {Weighill, Deborah and Jones, Piet and Shah, Manesh and Ranjan, Priya and Muchero, Wellington and Schmutz, Jeremy and Sreedasyam, Avinash and Macaya-Sanz, David and Sykes, Robert and Zhao, Nan and Martin, Madhavi Z. and DiFazio, Stephen and Tschaplinski, Timothy J. and Tuskan, Gerald and Jacobson, Daniel},
abstractNote = {Biological organisms are complex systems that are composed of functional networks of interacting molecules and macro-molecules. Complex phenotypes are the result of orchestrated, hierarchical, heterogeneous collections of expressed genomic variants. However, the effects of these variants are the result of historic selective pressure and current environmental and epigenetic signals, and, as such, their co-occurrence can be seen as genome-wide correlations in a number of different manners. Biomass recalcitrance (i.e., the resistance of plants to degradation or deconstruction, which ultimately enables access to a plant's sugars) is a complex polygenic phenotype of high importance to biofuels initiatives. This study makes use of data derived from the re-sequenced genomes from over 800 different Populus trichocarpa genotypes in combination with metabolomic and pyMBMS data across this population, as well as co-expression and co-methylation networks in order to better understand the molecular interactions involved in recalcitrance, and identify target genes involved in lignin biosynthesis/degradation. A Lines Of Evidence (LOE) scoring system is developed to integrate the information in the different layers and quantify the number of lines of evidence linking genes to target functions. This new scoring system was applied to quantify the lines of evidence linking genes to lignin-related genes and phenotypes across the network layers, and allowed for the generation of new hypotheses surrounding potential new candidate genes involved in lignin biosynthesis in P. trichocarpa, including various AGAMOUS-LIKE genes. Lastly, the resulting Genome Wide Association Study networks, integrated with Single Nucleotide Polymorphism (SNP) correlation, co-methylation, and co-expression networks through the LOE scores are proving to be a powerful approach to determine the pleiotropic and epistatic relationships underlying cellular functions and, as such, the molecular basis for complex phenotypes, such as recalcitrance.},
doi = {10.3389/fenrg.2018.00030},
journal = {Frontiers in Energy Research},
number = ,
volume = 6,
place = {Switzerland},
year = {Fri May 11 00:00:00 EDT 2018},
month = {Fri May 11 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.3389/fenrg.2018.00030

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Cited by: 18 works
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