{
  "id": 17249175,
  "title": "Fly taste connectome traces paths from sensation to action",
  "url": "https://urgent.news/2026/10/30/fly-taste-connectome-traces-paths-from-sensation-to-action",
  "topic": "health",
  "section": "Health & Medicine",
  "published": "2026-10-30T15:51:37.000Z",
  "source": {
    "name": "The Transmitter",
    "slug": "the-transmitter",
    "url": "https://www.thetransmitter.org/connectome/fly-taste-connectome-traces-paths-from-sensation-to-action/"
  },
  "original_language": "en",
  "account": "A groundbreaking mapping of taste-sensing neurons in fruit flies has revealed how these specialized cells connect to the brain and influence behaviors such as walking, swallowing, and insulin secretion. Published in Cell, this first-ever taste connectome for an animal more complex than Caenorhabditis elegans provides neuroscientists with a wealth of testable hypotheses about how neuronal circuits guide feeding behaviors.\n\nDrosophila, the fruit fly, possesses a sophisticated palate for detecting sweetness, bitterness, salt, water, carbonation, lipids, and amino acids. Taste-sensing neurons, scattered along the fly's tongue, throat, legs, and wings, transmit this sensory information to the brain, where it influences behavioral responses.\n\nThe team behind the new connectome used light microscopy to identify all taste-sensing neurons in male and female flies and determined what each neuron perceives based on its shape and gene expression. They then traced the axons extending from these taste neurons and their projections into the brain, using the full male nervous system connectome and the female fruit fly brain connectome.\n\nA key finding is that sweet-sensing neurons, regardless of their location on the fly's body, converge on similar downstream neurons. However, these pathways retain information about the body part that sensed the sweetness. This architecture allows the fly to exhibit the same type of behavior—acceptance—while adapting it to the situation. For instance, if the food is touched by the leg, the fly will stop, but if it's touched by the tongue, it will be swallowed.\n\nThe pharynx of a fly houses a diverse array of taste-sensing neurons, each potentially controlling specific aspects of behavior, such as swallowing and the release of insulin. The fly tongue alone has at least two newly identified types of taste-sensing neurons. While taste was once thought to be a purely feed-forward mechanism, the team discovered that feeding neurons are constantly inhibited, and taste releases this brake. This could be nature's way of preventing runaway behavior and maintaining control over processes.\n\nAs with all connectomes, this taste connectome requires validation. The researchers used artificial intelligence to predict neurotransmitter expression and neuronal excitation or inhibition, as well as constructed circuits based on mathematical estimates of connectivity between neurons separated by multiple synapses. However, just as a genome does not solve biology, a connectome is a valuable tool but does not solve the brain. It serves as a roadmap that can be further enriched with single-cell RNA sequencing data to determine which genes are expressed in particular neuronal states. This connectomics approach empowers scientists to probe the function of individual neurons using neurogenetics, ultimately providing a platform for future discoveries in the field.",
  "summary": "The map—the first of its kind for an animal more complex than Caenorhabditis elegans —gives neuroscientists a trove of testable hypotheses about how neuronal circuits guide feeding behaviors.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}