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© Melody Merle
Fluorescently labeled five day old gastruloid, a mouse embryonic stem-cell derived pseudo-embryo.
Publication : Cell

Optimal Decoding of Cellular Identities in a Genetic Network

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Cell - 31 Jan 2019

Petkova MD, Tkačik G, Bialek W, Wieschaus EF, Gregor T

Link to Pubmed [PMID] – 30712870

Cell 2019 Feb 7;176(4):844-855.e15

In developing organisms, spatially prescribed cell identities are thought to be determined by the expression levels of multiple genes. Quantitative tests of this idea, however, require a theoretical framework capable of exposing the rules and precision of cell specification over developmental time. We use the gap gene network in the early fly embryo as an example to show how expression levels of the four gap genes can be jointly decoded into an optimal specification of position with 1% accuracy. The decoder correctly predicts, with no free parameters, the dynamics of pair-rule expression patterns at different developmental time points and in various mutant backgrounds. Precise cellular identities are thus available at the earliest stages of development, contrasting the prevailing view of positional information being slowly refined across successive layers of the patterning network. Our results suggest that developmental enhancers closely approximate a mathematically optimal decoding strategy.

Direct link to article

https://www.ncbi.nlm.nih.gov/pubmed/30712870