Photo of Jeffrey H. Chuang, Ph.D.

Jeffrey H. Chuang, Ph.D.

Associate Professor, Genetics and Genome Sciences
Academic Office Location:
The Jackson Laboratory for Genomic Medicine
263 Farmington Avenue
Farmington, CT 06030-901
Phone: 860-856-2473
Email: jeff.chuang@jax.org
Website(s):

Genetics and Developmental Biology Graduate Program

Chuang Lab Page

Education
DegreeInstitutionMajor
B.A.Harvard UniversityChemistry and Physics
Ph.D.Massachusetts Institute of TechnologyPhysics

Post-Graduate Training
TrainingInstitutionSpecialty
FellowshipMITKarl Taylor Compton Graduate Fellowship for Theoretical Physics
FellowshipMITNational Science Foundation Graduate Fellowship
PostdoctoralUCSFPostdoctoral Fellowship in Interdisciplinary Informatics
PostdoctoralUniversity of California, San FranciscoDepartment of Biochemistry and Biophysics, Advisor: Hao Li.

Awards
Name of Award/HonorAwarding Organization
National Science Foundation Graduate Fellowship, (1997-1999) MIT
American Association for the Advancement of Science Mass Media FellowshipAmerican Association for the Advancement of Science
Phi Beta KappaHarvard University
National Science Scholar (1992-1996)

Broad advances in DNA sequencing have radically transformed the scale and nature of genetics making it possible to analyze genomic changes across species, individuals, cell-types, and as mutations accrue and are subject to natural selection. Diverse phenotypic datasets have also grown rapidly, not only for sequencing-based assays such as gene expression and protein-nucleic acid interactions, but also other types including metabolomic, clinical, and drug-screening data. My lab is interested in computational and mathematical approaches to analyzing such large data sources, to understand how genomes function and evolve. Since moving to the Jackson Laboratory for Genomic Medicine in 2012, the lab been focusing on cancer genomics and RNA-level gene regulation.


Cancer Genomics Our lab is currently involved in multiple projects in cancer genomics, with a focus on the genomics of patient-derived xenografts. We are especially interested in tumor heterogeneity.


RNA-level Gene Regulation Our lab is currently involved in multiple projects in RNA-level gene regulation, with a focus on processes regulation translation, protein-RNA binding, and splicing. These works are related to our prior studies of the functions and neutral evolutionary behavior of synonymous sites in coding sequences. Such sequences contain a substantial amount of selection in a variety of phylogenies (Kural et al 2009). We have shown for example that coding sequences are replete with binding sites for microRNAs, as well as other types of functional sequences such as exonic splicing enhancers. Such sites exhibit a strong selective pressure on the synonymous sites of coding regions.


Functions of Highly Conserved Enhancer Sequences In a given phylogeny, comparative sequence data can be used to infer the functional sequences within genomes. Just as morphological features shared among species (e.g. all vertebrates have a spine) are likely to be important to those species, DNA sequences shared among species are likely to be functional. One of the organisms we focus on is the model vertebrate Danio rerio, i.e. the zebrafish. Our lab collaborates with the Guo lab at UCSF to study conserved noncoding elements, sequences with conservation far beyond what would be expected by neutral mutation in vertebrate intergenic regions. For example, at a threshold of at least 50 bp and at least 50% sequence identity, there are 73187 strand-specific CNEs conserved between zebrafish and human. A major challenge in understanding these CNEs is to organize them in a meaningful way, analogous to the organization of genes provided by the Gene Ontology. We have recently developed a tool for organizing CNEs based on the expression of nearby genes (cneviewer.zebrafishcne.org, Persampieri et al 2008), as this may provide a key to understanding the tissue-specific enhancer behavior of CNEs. We are also exploring the relative importance of cis- and trans- regulatory effects on the functional behavior of enhancers (Ritter et al 2010).


Other Prior Interests Other model organisms with which we have expertise are the malaria parasite Plasmodium falciparum and the yeast S. cerevisiae. A central mystery of the malaria genome is how transcription is regulated. We have observed that there is far less intergenic sequence apparently under purifying selection in malaria than in yeast genomes, suggesting that transcription regulation is simpler in malaria (Imamura, Persampieri and Chuang, 2007). We have also applied comparative techniques to identify functional sites in the promoters of the Saccharomyces genus of yeasts, to estimate the complexity of gene regulation and the types of genes likely to be under the strictest regulation (Chin, Chuang, and Li 2005).


Our lab is also interested in a variety of issues in molecular evolution related to the balance of functional and neutral pressures in genomes. For example, one puzzle is why mutation rates are uniform in some species, such as the sensu stricto yeasts, while rates vary by location in other species, such as mouse and human. We have found that all mammalian species have regional mutation biases, typically on a scale of several megabases. In contrast, all yeasts have uniform mutation rates, with the exception of the Candida clade (Fox et al 2008; Chuang and Li 2004; Chuang and Li 2007; Chin, Chuang, and Li 2005). In species where the mutation rate is non-uniform, we are interested in questions such as what structural or sequence features affect mutation rates, and whether gene locations have evolved to make use of mutational heterogeneity.


Previously the lab also has worked on the analysis of high-throughput lipidomic data. Our lab has collaborated with the Seyfried Lab (Boston College) and the Han Lab (Washington University in St. Louis) to analyze lipid content in cancerous vs. non-cancerous tissues. Our group is developing tools to analyze which aspects of lipid content are important to cancer phenotypes (Kiebish et al 2008). This work is closely tied to evaluating the Warburg theory of cancer, as described in this report. We have also developed both equilibrum and dynamic models to explain the distributions of lipids found in normal and cancerous tissues (Kiebish et al 2010).

Accepting students for Lab Rotations: Summer '17


We are currently seeking graduate students interested in a variety of problems in post-transcriptional regulation and cancer genomics. Our lab is a computational lab and students should have expertise/interest in programming and quantitative approaches.

Journal Articles

Book Chapters

  • Imprinting Using Smart Polymers
    C. Alvarez-Lorenzo, A. Concheiro, Jeffrey Chuang and A. Yu. Grosberg Smart Polymers: Applications in Biotechnology and Biomedicine 2007 Jan;
Title or AbstractTypeSponsor/EventDate/YearLocation
Next Generation Sequencing and Its Applications to RNA BiologyLectureConference on Next Generation Sequencing Applications Asia2012Singapore
CodingMotif: Exact Determination of Overrepresented Motifs in Coding Sequences. Intelligent Systems for Molecular BiologyLectureRocky Mountain Conference2011Aspen, CO
Functional Elements in Vertebrate Coding SequencesLectureSymposium on Transcriptional Dynamics, Evolution, and Systems Biology2011Michigan State, East Lansing, MI
Whose Code Is It Anyway? Transcriptional Enhancers Are Embedded in Protein-Coding Exons of Vertebrate Developmental GenesTalkBiology of Genomes Conference2011Cold Spring Harbor Laboratory
Highly Conserved Coding Sequences Act as EnhancersLectureRECOMB Satellite Meeting on Regulatory Genomics2010Columbia University. New York, NY
Regulation, Evolution, and Networks: Some Insights from Computational Biology. LectureBoston College Biology Colloquium2010Chestnut Hill, MA
Evolution of Orthologous Fish and Mammalian Enhancer Activity. LectureSociety for Molecular Biology and Evolution Meeting2010Lyon, France
Noncoding Selection on Motifs in Coding Regions. LectureSociety for Molecular Biology and Evolution Meeting2009Iowa City, Iowa
Comparative Analysis of Enhancers and Regulatory Motifs for Gene Expression in the Vertebrate Brain. LectureRECOMB Satellite Conference on Regulatory Genomics2008Broad Institute of MIT and Harvard, Cambridge, MA
Sequences Conserved by Selection Across Mouse and Human Malaria Species. LectureComparative Genomics of Malaria Parasites Meeting2007American Museum of Natural History, New York, NY
Sequences Conserved by Selection Across Mouse and Human Malaria Species. LectureSociety for Molecular Biology and Evolution Meeting2007Halifax, Canada