Researchers Developed Whole-Body Imaging Method
The new WHOLISTIC technique captures calcium activity across the entire body of a larval zebrafish.
Updated on Oct. 1, 2026 in Life Sciences
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Scientists have introduced the WHOLISTIC live-imaging method to monitor dynamic calcium activity throughout an entire organism. This system allows researchers to observe cellular behavior in larval zebrafish and adult Danionella cerebrum with unprecedented clarity.
Why it matters
The method was developed to provide an organism-wide view of dynamic physiology, bridging gaps in our understanding of how different bodily systems interact. It enables researchers to see how cellular processes across a whole body connect to physiological states.
The WHOLISTIC method, which stands for WHole-Organism Live-Imaging System for recording Tissue and IntraCellular activity, uses optical and computational tools to image calcium activity in every cell of a fish body.
The players
Ruetten et al.
This team of researchers developed the WHOLISTIC live-imaging method to advance physiological observation.
The details
Researchers found that most cells in larval zebrafish exhibit time-varying calcium activity, including slow waves among ependymal cells in the hindbrain and spinal cord during rest. Additionally, the team observed that hindbrain activity is responsible for triggering mesenteric arterial constriction when the organism experiences hypoxia.
Timeline
The study describing the WHOLISTIC method was published in 2026.
The Big Picture
This research follows the precedent set by the Nature publication S41586-026-10979-6, moving the field of life sciences from localized cellular study toward a holistic view of organism-wide systemic interaction.
This breakthrough provides a new blueprint for studying physiological reactions, potentially leading to a deeper understanding of how brain-body signaling works in complex organisms. Such insights may eventually inform future medical treatments that target systemic rather than isolated cellular issues.
The takeaway
The WHOLISTIC method demonstrates that near-total body imaging is now a viable tool for mapping complex physiological responses. Future research using this system could rewrite our understanding of how neural activity translates into systemic bodily functions.
Further reading
Learn more about the latest innovations in biological observation in our Life Sciences section.
More information
Review the full findings in the Original research publication in Nature.
Source note: This article includes information reported by Nature.
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