Joshua Coon, PhD

Portrait of Joshua Coon, PhD
4426 Biotech
425 Henry Mall
Madison, WI 53706
(608) 263-1718 (O); 608.890.0763 (L)
Focus Groups: 
Signal Transduction
PhD University of Florida
Postdoctoral Studies University of Virginia
Research Summary: 
Bioanalytical Chemistry, Chemical Biology, Systems Biology, Mass Spectrometry, Proteomics
Research Detail: 

The sequencing of the human genome marked the beginning of a collective scientific expedition to understand complex organisms.  Genes, of course, merely contain the instructions for which proteins--the ultimate biological effector molecules--populate the cell.  Untangling the multi-faceted networks that regulate complex organisms and their diseases will require innovative technologies to globally monitor gene, protein, and transcript.  Transcript measurement technologies are well-developed, high throughput, and broadly accessible.  Next-gen sequencers, for example, can detect and quantify up to twenty thousand messages from multiplexed samples in less than one week.  This capability has had a fantastic and transformative impact on modern biology and medicine.  For numerous reasons, protein analysis is considerably less evolved and markedly less accessible, such that we depend on protein measurement by proxy.  Transcriptomics is no surrogate for proteomics: first, recent large-scale analyses only show marginal protein/RNA correlation (R = 0.4-0.6) and second, post-translational modifications (PTMs) are only detectable at the protein level.

Fig 1; Stem cell Phosphoproteomics.Fig.1. Stem cell Phosphoproteomics.
We used quantitative proteomics to compare phosphorylation events between pluripotent cell types (embryonic stem (ES) cells and induced pluripotent stem (iPS) cells) and differentiated cells (newborn foreskin fibroblast (NFF) cells).  We then applied the Group-based Prediction System (GPS) database to match differentially regulated sites to their cognate kinases.  Shown to the left is a phylogenetic tree depicting kinases with increased activity in pluripotent cells (red) and NFF cells (blue).  Note that various branches of the kinase tree are devoted to a particular cell type.  For example, CMGC kinases show increased activity in pluripotent cells, while CAM kinases are active in differentiated cells.  (From Phanstiel DH, Brumbaugh j, Wenger CD, Tian S, Probasco MD, Bailey DJ, Swaney DL, Tervo MA, Bolin JM, Ruotti V, Stewart S, Thomason JA, Coon JJ. Proteomic and phosphopreteomic comparison of human ES and iPS cells.  Nature Methods, 2011.)

To confront these limitations, and more broadly, to continue the grand journey launched by the Human Genome Project, the Coon group seeks to develop next-generation protein measurement technologies and an integrated informatics platform to assimilate data with gene- and transcript-level figures.  These essential technologies are developed in the context of a cadre of driving biomedical projects ranging from basic to translational – i.e., the yeast environmental stress response, the maintenance of pluripotency, and IgA nephropathy pathogenesis, among others.

AIM 1.  To render the pace, depth, and reproducibility of protein and PTM quantification commensurate with transciptomic technologies.  Current proteomic technologies lack throughput, sensitivity, and reproducibility, as compared to RNA-based methods.  Complete coverage of specific protein pathways or functional groups, for example, is not typical (i.e., all 500 kinases, 1,400 transcription factors, etc.).  Likewise, overlapping identifications in replicate experiments are low (35-60%).  Lacking completeness and reproducibility limits the quantity and quality of biological conclusions that can be drawn from  proteomic experiments.  The coon group is developing novel technologies directed at resolving each of these fundamental limitations.

AIM 2.  To develop computational methods for integration on gene, transcript, and protein-level data.  Mature, broadly accessible computational methods for integration of these massive data sets that comprise multiple planes of measurement do not presently exist.  We will develop such technologies and integrate them with existing publicly available information.  Ultimately, we aim to eliminate the tedious, and more often overwhelming and impenetrable, task of assimilating massive datasets to allow non-expert researchers to easily and expediently derive biological meaning.

Selected Publications: 
Complete genome sequence and the expression pattern of plasmids of the model ethanologen Zymomonas mobilis ZM4 and its xylose-utilizing derivatives 8b and 2032. Yang S, Vera JM, Grass J, Savvakis G, Moskvin OV, Yang Y, McIlwainSJ, Lyu Y, Zinonos I, Hebert AS, Coon JJ, Bates DM, Sato TK, Brown SD, Himmel ME, Zhang M, Landick R, Pappas KM, Zhang Y. Biotechnol Biofuels. 2018 May 2;11:125. doi: 10.1186/s13068-018-1116-x. eCollection 2018. PMID: 29743953
Network inference reveals novel connections in pathways regulating growth and defense in the yeast salt response. MacGilvray ME, Shishkova E, Chasman D, Place M, Gitter A, Coon JJ, Gasch AP. PLoS Comput Biol. 2018 May 8;13(5):e1006088. doi: 10.1371/journal.pcbi.1006088. eCollection 2018 May. PMID: 29738528
Proteomic and Phosphoproteomic Changes Induced by Prolonged Activation of Human Eosinophils with IL-3. Esnault S, Hebert AS, Jarjour NN, Coon JJ, Mosher DF. J Proteome Res. 2018 May 4. doi: 10.1021/acs.jproteome.8b00057. [Epub aheadof print] PMID: 29706072
LipiDex: An Integrated Software Package for High-Confidence Lipid Identification. Hutchins PD, Russell JD, Coon JJ. Cell Syst. 2018 Apr 17. pii: S2405-4712(18)30108-X. doi: 10.1016/j.cels.2018.03.011. [Epub ahead of print] PMID: 29705063
Expression of novel "LOCGEF" isoforms of ARHGEF18 in eosinophils. Turton KB, Wilkerson EM, Hebert AS, Fogerty FJ, Schira HM, Botros FE, Coon JJ, Mosher DF. J Leukoc Biol. 2018 Mar 30. doi: 10.1002/JLB.2MA1017-418RR. [Epub ahead of print] PMID: 29601110
Caloric Restriction Engages Hepatic RNA Processing Mechanisms in Rhesus Monkeys. Rhoads TW, Burhans MS, Chen VB, Hutchins PD, Rush MJP, Clark JP, Stark JL, McIlwain SJ, Eghbalnia HR, Pavelec DM, Ong IM, Denu JM, Markley JL, Coon JJ, Colman RJ, Anderson RM. Cell Metab. 2018 Mar 6;27(3):677-688.e5. doi: 10.1016/j.cmet.2018.01.014. PMID: 29514073
Islet proteomics reveals genetic variation in dopamine production resulting in altered insulin secretion. Mitok KA, Freiberger EC, Schueler KL, Rabaglia ME, Stapleton DS, Kwiecien NW, Malec PA, Hebert AS, Broman AT, Kennedy RT, Keller MP, Coon JJ, Attie AD. J Biol Chem. 2018 Apr 20;293(16):5860-5877. doi: 10.1074/jbc.RA117.001102. Epub 2018 Mar 1. PMID: 29496998
Novosphingobium aromaticivorans uses a Nu-class glutathione S-transferase as a glutathione lyase in breaking the β-aryl ether bond of lignin. Kontur WS, Bingman CA, Olmsted CN, Wassarman DR, Ulbrich A, Gall DL, Smith RW, Yusko LM, Fox BG, Noguera DR, Coon JJ, Donohue TJ. J Biol Chem. 2018 Apr 6;293(14):4955-4968. doi: 10.1074/jbc.RA117.001268. Epub 2018 Feb 15. PMID: 29449375
Identifying Novel Signaling Pathways: An Exercise Scientists Guide to Phosphoproteomics. Wilson GM, Blanco R, Coon JJ, Hornberger TA. Exerc Sport Sci Rev. 2018 Apr;46(2):76-85. doi: 10.1249/JES.0000000000000146. PMID: 29346157
Chemical genomic guided engineering of gamma-valerolactone tolerant yeast. Bottoms S, Dickinson Q, McGee M, Hinchman L, Higbee A, Hebert A, Serate J, Xie D, Zhang Y, Coon JJ, Myers CL, Landick R, Piotrowski JS. Microb Cell Fact. 2018 Jan 12;17(1):5. doi: 10.1186/s12934-017-0848-9. PMID: 29329531