NIMBioS logo banner.

NIMBioS Seminar Series

In conjunction with the interdisciplinary activities of the National Institute for Mathematical and Biological Synthesis (NIMBioS), a seminar series on topics in mathematical biology will be hosted at NIMBioS every other Tuesday at 3:30 p.m. (unless otherwise noted) in the Hallam Auditorium, Room 206, Claxton Building, 1122 Volunteer Blvd. Seminar speakers will focus on their research initiatives at the interface of mathematics and many areas of the life sciences. Light refreshments will be served in Room 205 beginning 30 minutes before each talk. Faculty and students from across the UT community are welcome to join us.

N. Panchy photo.

Speaker: Dr. Nicholas Panchy, NIMBioS Postdoctoral Fellow

Time/Date: Tuesday, January 23, 2018, 3:30 p.m.*

Location: Room 206, Claxton Building, 1122 Volunteer Blvd.

Topic: Modeling gene expression and regulation in response to light-dark signaling

Abstract: Although gene expression has been profiled in more than three thousand different species, the analysis of these data remains challenging in part because multiple signals effect gene regulation. In particular, endogenous (circadian) and exogenous (e.g., light-dark) cycles are prominent in biological systems, especially those that undergo photosynthesis. Using expression data from the model green algae Chlamydomonas reinhardtii, I found that half of the annotated genes are expressed cyclically in response to light-dark variation by using two different approaches to model cyclic expression. Among these light-dark genes, the timing of peak expression (phase) is both correlated with annotated gene function and evolutionarily constrained between duplicate pairs, indicating this cyclic behavior is biologically significant. However, while I was able to identify cis-regulatory elements that were associated with different phases of light-dark expression, these cis-elements proved to be poor predictors of cyclic expression phase on their own, raising question about the complexity of gene network regulating the timing of expression. It was these questions that ultimately led to my current work studying the timing of events in cell differentiation and regulation of ribosomes by cyclic signals.

Dr. Nicholas Panchy (Ph.D. Genetics, Michigan State Univ.) is exploring the role and regulation of intermediate epithelial-to-mesenchymal transition (EMT) cell - types by modeling gene regulatory networks controlling expression across EMT.

*Join us for refreshments at 3 p.m.

Seminar Flyer (pdf)

Live-stream icon. Live Stream. Unless otherwise noted, NIMBioS seminars are streamed live. To view the live stream, visit Join the live chat of the seminar via Twitter (#nimbios), which is displayed to the right of the live stream We encourage you to post questions/comments and engage in discussion with respect to our Social Media Guidelines. Live-streamed seminars are archived for later viewing on NIMBIoS' YouTube channel.

For more information about this and other NIMBioS Seminars, visit

1122 Volunteer Blvd., Suite 106
University of Tennessee
Knoxville, TN 37996-3410
PH: (865) 974-9334
FAX: (865) 974-9300
Contact NIMBioS

NSF logo. NIMBioS is sponsored by the National Science Foundation through NSF Award #DBI-1300426, with additional support from The University of Tennessee, Knoxville. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
©2008-2017 National Institute for Mathematical and Biological Synthesis. All rights reserved.