The MAPK/ERK channel capacity exceeds 6 bit/hour

Area of Science:

• Cellular biology
• Molecular signaling
• Systems biology

Background:

• Cells process external signals via complex pathways.
• Understanding information flow in these pathways is key to deciphering cellular dynamics.
• The MAPK/ERK pathway plays a critical role in cellular information processing.

Purpose of the Study:

• To quantify the information transmission rate of the MAPK/ERK signaling pathway.
• To assess the pathway's capacity for transducing temporally encoded signals.
• To investigate the role of MAPK/ERK in responding to dynamic stimuli.

Main Methods:

• Utilized an epithelial cell line with a light-activatable FGF receptor.
• Employed an ERK activity reporter to monitor pathway activation.
• Stimulated cells with random light pulse trains to encode signals.
• Developed an input reconstruction algorithm to decode transmitted information.

Main Results:

• The MAPK/ERK pathway demonstrated a channel capacity of at least 6 bits per hour.
• The input reconstruction algorithm achieved 1-minute accuracy in detecting light pulses.
• Accurate pulse detection occurred within 5 minutes of stimulus presentation.

Conclusions:

• The MAPK/ERK pathway exhibits a high information transmission rate.
• This capacity supports the coordination of cellular processes like movement.
• The pathway is capable of responding to rapid environmental changes, such as chemoattractant gradients.