A comprehensive model of the phototransduction cascade in mouse rod cells

Mol Biosyst. 2014 Jun;10(6):1481-9. doi: 10.1039/c3mb70584f. Epub 2014 Mar 28.

Abstract

Vertebrate visual phototransduction is perhaps the most well-studied G-protein signaling pathway. A wealth of available biochemical and electrophysiological data has resulted in a rich history of mathematical modeling of the system. However, while the most comprehensive models have relied upon amphibian biochemical and electrophysiological data, modern research typically employs mammalian species, particularly mice, which exhibit significantly faster signaling dynamics. In this work, we present an adaptation of a previously published, comprehensive model of amphibian phototransduction that can produce quantitatively accurate simulations of the murine photoresponse. We demonstrate the ability of the model to predict responses to a wide range of stimuli and under a variety of mutant conditions. Finally, we employ the model to highlight a likely unknown mechanism related to the interaction between rhodopsin and rhodopsin kinase.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Algorithms
  • Amphibians / physiology*
  • Animals
  • Computational Biology / methods*
  • G-Protein-Coupled Receptor Kinase 1 / metabolism
  • Mice
  • Models, Animal
  • Models, Biological*
  • Retinal Rod Photoreceptor Cells / physiology*
  • Signal Transduction
  • Vision, Ocular

Substances

  • G-Protein-Coupled Receptor Kinase 1