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Inferring Stochastic Rates from Heterogeneous Snapshots of Particle Positions

Journal Article · · Bulletin of Mathematical Biology
 [1];  [2];  [1];  [3]
  1. Univ. of California, Irvine, CA (United States)
  2. Tulane Univ., New Orleans, LA (United States)
  3. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Many imaging techniques for biological systems—like fixation of cells coupled with fluorescence microscopy—provide sharp spatial resolution in reporting locations of individuals at a single moment in time but also destroy the dynamics they intend to capture. In this study, these snapshot observations contain no information about individual trajectories, but still encode information about movement and demographic dynamics, especially when combined with a well-motivated biophysical model. The relationship between spatially evolving populations and single-moment representations of their collective locations is well-established with partial differential equations (PDEs) and their inverse problems. However, experimental data is commonly a set of locations whose number is insufficient to approximate a continuous-in-space PDE solution. Here, motivated by popular subcellular imaging data of gene expression, we embrace the stochastic nature of the data and investigate the mathematical foundations of parametrically inferring demographic rates from snapshots of particles undergoing birth, diffusion, and death in a nuclear or cellular domain. Toward inference, we rigorously derive a connection between individual particle paths and their presentation as a Poisson spatial process. Using this framework, we investigate the properties of the resulting inverse problem and study factors that affect quality of inference. One pervasive feature of this experimental regime is the presence of cell-to-cell heterogeneity. Rather than being a hindrance, we show that cell-to-cell geometric heterogeneity can increase the quality of inference on dynamics for certain parameter regimes. Altogether, the results serve as a basis for more detailed investigations of subcellular spatial patterns of RNA molecules and other stochastically evolving populations that can only be observed for single instants in their time evolution.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Institutes of Health (NIH)
Grant/Contract Number:
NA0003525
OSTI ID:
2394705
Report Number(s):
SAND--2024-08367J
Journal Information:
Bulletin of Mathematical Biology, Journal Name: Bulletin of Mathematical Biology Journal Issue: 6 Vol. 86; ISSN 0092-8240
Publisher:
Society for Mathematical Biology - SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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