The overarching goal of this project is to develop analytic methods that enable scientists to efficiently and automatcially discover relationships between shape and function in biological systems. This work has been supported by the NSF Emerging Frontiers and Biological Infrastructure Divisions in the form of a large collaborative effort on bioshape (bioshapes.org, DBI-1053036) and a collaborative project on bioimage analysis for understanding pollen morphology and texture (DBI-1262547)
- D. Tcheng, A. Nayak, C. Fowlkes, S. Punyasena,
"Visual recognition software for binary classification and its application to spruce pollen identification"
11(2): e0148879. doi:10.1371/journal.pone.0148879.
- S. Punyasena, L. Mander, M. Li, W. Mio, C. Fowlkes, Classifying grass pollen using
high-resolution imaging and the quantitative analysis of surface texture, BSA symposium on
Bioinformatic and Biometric Methods in Plant Morphology
- L. Mander, M. Li, W. Mio, C. Fowlkes, S. Punyasena, "Classification of grass
pollen through the quantitative analysis of surface ornamentation and texture",
Proc. R. Soc. B. 2013 280 (1770) [pdf]
- B. Kong, C. Fowlkes, "Fast Convolutional Sparse Coding", UCI Technical Report, May 2014 [pdf]
- Texture recognition using sparse coding histograms and nearest-neighbor classification. This code include a MATLAB demo for classifying grass pollen SEM images (dataset from Mander et al 2013) which achieves ~77 percent accuracy in species identification.
- Fast sparse convolutional sparse coding implementation from Bailey Kong
- A. Cinquin, M. Chiang, A. Paz, S. Hallman, O. Yuan, C. Fowlkes, O.
Cinquin, "Intermittent stem cell cycling balances self-renewal and senescence
of the C. elegans germ line", in press, PLoS Genetics (2016)
- M. Chiang, S. Hallman, A. Cinquin, N. Reyes de Mochel, A. Paz, S. Kawauchi, A. Calof, K. Cho, C. Fowlkes, O. Cinquin,
"Analysis of in vivo single cell behavior by high throughput, human-in-the-loop segmentation of three-dimensional images",
BMC Bioinformatics 2015, 16:397 doi:10.1186/s12859-015-0814-7.
- S. Hallman, C. Fowlkes, "Oriented Edge Forests for Boundary Detection",
CVPR, Boston, MA, (June 2015).
arXiv:1412.2066 [pdf] [code]
X. Zhu, C. Vondrick, C. Fowlkes, D. Ramanan, "Do we need more training data?",
IJCV, DOI 10.1007/s11263-015-0812-2, 2015
- S. Wang, C. Fowlkes, "Learning Optimal Parameters for Multi-target Tracking",
S. Hallman, C. Fowlkes, "Oriented Edge Forests for Boundary Detection",
CVPR, Boston, MA, (June 2015).
- MATLAB code for training template based detectors for detecting cell nuclei in fluorescence image stacks.
- MATLAB code for learning and inference in multi-target tracking with pairwise interactions between objects.
M. Staller, C. Fowlkes, M. Bragdon, J. Estrada, Z. Wunderlich, A. DePace, "A
gene expression atlas of a bicoid-depleted Drosophila embryo reveals early canalization of cell fate",
Development 142, p. 587-596, (2015)
- C. Fowlkes, K. Eckenrode, M. Bragdon, M. Meyer, Z. Wunderlich, L.
Simirenko, C. Hendriks, S. Keranen, C. Henreiquez, M. Biggin, M. Eisen,
A. DePace, "A conserved developmental patterning network produces
quantitatively different output in multiple species of Drosophila,"
7(10): e1002346, 2011. [pdf]
- C. Fowlkes, C. Luengo Hendriks, S. Keränen, G. Weber, O.
Rübel, M-Y Huang, S. Chatoor, L. Simirenko, A. DePace C.
Henriquez, A. Beaton, R. Weiszmann, S. Celniker, B. Hamann, D.
Knowles, M. Biggin, M. Eisen, J. Malik.
"Constructing a quantitative spatio-temporal atlas of gene expression in the Drosophila blastoderm",
Cell, 133(2), p. 364-374, 2008.
- PointCloudAlign toolkit (v1.0.1) for registering gene expression patterns acquired using the BDTNP PointCloudToolbox image processing pipeline
- C. McCusker, A. Athippozhy, C. Diaz-Castillo, C. Fowlkes, D.
Gardiner, S. Voss, "Positional Plasticity in Regenerating Amybstoma
mexicanum Limbs Is Associated With Cell Proliferation and Pathways of
Cellular Differentiation", BMC Developmental Biology, 15:45,
DOI 10.1186/s12861-015-0095-4 (2015).
- A. Chen, D. Lieu, L. Freschauf, V. Lew, H. Sharma, J. Wang, D. Nguyen, I. Karakikes, R. Hajjar, A. Gopinathan, E.
Botvinick, C. Fowlkes, R. Li, M. Khine, "Shrink-Film Configurable Multiscale
Wrinkles for Functional Alignment of Human Embryonic Stem Cells and their
Cardiac Derivatives", 10.1002/adma.201103463, Advanced Materials, 2011.
- J. Luna, J. Ciriza, M. Ojeda-Garcia, M. Kong, A. Herren, D. Lieu, R. Li, C. Fowlkes, M. Khine, K. McCloskey,
"Multi-scale Biomimetic Topography for the Alignment of Neonatal and
Embryonic Stem Cell-derived Heart Cells",
Tissue Engineering: Part C , 17(5), p. 579-588 , 2011
- A. Chen, E. Lee, R. Tu, K. Santiago, A. Grosberg, C. Fowlkes, M. Khine, "Integrated Platform for Functional Monitoring of Biomimetic Heart Sheets Derived From Human Pluripotent Stem Cells", Biomaterials, 35(2):675-683. [pdf]
Pollen Texture-based Classification and Analysis (with Punyasena Lab at UIUC)
The practice of identifying pollen has a large number of scientific applications and is used in fields as diverse as archaeology, biostratigraphy (the dating of rocks), and forensic science. Pollen and spores play a particularly important role in paleontology, because they form the most abundant and extensive record of plant diversity, dating back hundreds of millions of years. However, many critical hypotheses in plant ecology and evolution (e.g. the assembly of plant communities, speciation and extinction) cannot be fully tested with pollen data due to the extreme difficulty of recognizing species from pollen and spore material. We are developing methods for automatically classifying pollen based on texture and shape features. This approach has been validated in distinguishing visually similar SEM images of pollen from several different species based on fine scale textural differences.
Adaptive software for automated detection, tracking and segmentation (with Cinquin Lab at UCI)
While the particular uses of images as an experimental tool in biology vary widely, the common tasks of recognition, grouping and tracking are ubiquitous. At present, automated image analysis is typically limited to large scale projects that can justify the resources required for development of custom software. The resulting systems are often brittle and require redevelopment each time a slightly different dataset appears. We are working on generic tools that can be interactively retrained by the end user with the goal of expanding the role of quantitative imaging and modeling in biology by “mining the long tail” of under-analyzed experimental data.
Gene expression and developmental patterning in Drosophila (with DePace Lab at Harvard)
For a gene to function properly, it must be active in the right place, at the right time, and in the right amount. Changes in any of these features can lead to observable differences between individuals and species and in some cases can lead to disease. We do not currently understand how the position, timing, and amount of gene expression is encoded in DNA sequence. One approach to this problem is to compare how gene expression differs between species and to try to relate changes in DNA sequence to changes in gene expression. We are developing methods for measuring and comparing gene expression patterns at high spatial and temporal resolution between embryos of different species of Drosophila. The methods allow us to control for variation in the size, shape, and number of nuclei between embryos.
Quantification of cellular and sub-cellular alignment (with Khine Lab at UCI)
Nano- and microscale topographical cues play critical roles in the induction and maintenance of various cellular functions, including morphology, adhesion, gene regulation, and communication. Recent studies indicate that structure and function at the heart tissue level is exquisitely sensitive to mechanical cues at the nano-scale as well as at the microscale level. We have developed image analysis tools coupled with an inexpensive culture platform comprised of biomimetic wrinkles that simulate the heart’s complex anisotropic and multiscale architecture for facile and robust cardiac cell alignment. We demonstrate the cellular and subcellular alignment of both neonatal mouse cardiomyocytes as well as those derived from human embryonic stem cells. By mimicking the fibrillar network of the extracellular matrix, this system enables monitoring of protein localization in real time and therefore the high-resolution study of phenotypic and physiologic responses to in-vivo like topographical cues.
Functionally derived shape metrics for analyzing Bat Biosonar (with Mueller Lab at VT)
Statistical analysis of collections of shapes typically relies on some measure of distance between shapes which is specified a priori without consideration of the relevance of particular modes of variation to biological function. We are developing methods that leverage accurate simulation of acoustical propagation to understand the functional importance of aspects of bat ear and noseleaf shape. We exploit the adjoint method to efficiently perform a global analysis of the sensitivity of acoustical performance to shape features.
Interactive WebGL visualization of ear geometry and beam pattern [link]
Registration of chick embryo outflow tract dynamics with fluorescence microscopy-based protein expression data (with Rugyoni Lab at OHSU)
It is known that changes in hemodynamic forces affect developmental growth of the heart but mechanisms underlying this process are not well understood. We are developing methods that combine dynamic shape data collected from the functioning outflow tract in chick embryo along with protein expression data (e.g. collagen) in order to try and discover correlations between the dynamic shape and underlying tissue development.
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.