Biology subjects

Enjin, A.

Publications and source records attributed to Enjin, A..

4 recordsLinked to original sources

bioRxiv2025

Conserved molecular signatures of hygrosensory neurons in two dipteran species

Small poikilothermic animals like insects rely on environmental sensing for survival. The ability to detect humidity and temperature through specialized sensory neurons is particularly critical, allowing them to maintain water balance across diverse environments. While recent studies have identified key receptors associated with humidity sensing, our understanding of the broader molecular architecture underlying these sensory systems remains incomplete. Here, we conducted a comparative analysis of humidity receptor neurons (HRN) between the vinegar fly Drosophila melanogaster and the yellow fever mosquito Aedes aegypti. We identified 21 genes that define the molecular identity of HRNs. These genes encode proteins involved in transcriptional regulation, cellular signaling, enzymatic pathways and cellular organization. Through behavioral analysis, we demonstrate essential roles for three of these genes, the serotonin receptor 5-HT7, the transcription factor nubbin and the kinesin motor protein Kif19A are all required for humidity-guided behavior. The conservation of this molecular toolkit between species separated by over 200 million years of evolution suggests shared functional requirements for environmental sensing in insects. Our findings provide insights into fundamental principles of sensory neuron organization and oeer a framework for understanding how specialized sensory systems evolve and maintain their function.

animal behavior and cognition↗

bioRxiv2024

Humidity-dependent structural adaptations of Drosophila melanogaster hygrosensilla

Understanding how organisms detect environmental humidity remains a fundamental problem in sensory biology. While specialized sensory neurons in insect antennae can detect changes in humidity, the mechanism underlying this ability is not fully understood. Here, we present an integrated approach combining precise humidity control, rapid cryo-preservation, and serial block-face scanning electron microscopy (SBF-SEM) to investigate the ultrastructure of hygrosensilla in the vinegar fly Drosophila melanogaster. We developed a deep learning-based segmentation pipeline to analyze three-dimensional structural features of sensilla exposed to different humidity conditions at stable temperature. Our analysis reveals consistent differences in sensilla width between high (80% RH) and low (26% RH) humidity conditions across all chambers of the sacculus. Additionally, we identified chamber-specific patterns in sensilla tapering, indicating specialized structural adaptations across different sensilla populations. The observed structural changes suggest a potential role for mechanical transduction in humidity sensing. This study establishes a technical framework for high-resolution analysis of sensory organs while providing new insights into the structural basis of humidity detection. Our findings advance our understanding of how specialized sensory organs might transduce environmental signals into neural responses.

neuroscience↗

bioRxiv2023

A dynamic humidity arena to explore humidity related behaviours in insects

Humidity is a critical environmental factor influencing the behaviour of terrestrial organisms. Despite its significance, the neural mechanisms and behavioural algorithms governing humidity sensation in insects remain elusive. In this study, we introduce a novel dynamic humidity arena to investigate humidity-guided behaviour in the vinegar fly Drosophila melanogaster. The arena allows precise humidity control, low error rates, and fast settling times, making it a robust tool for studying humidity-related behaviours. Our results reveal that desiccated and starved flies (DS flies) search for higher relative humidity environments (65-75%) while sated flies tend to stay within their initial environments. In contrast, Ionotropic receptor (Ir)93a mutant flies with impaired humidity sensing show no preference to relative humidity. The search for higher humidity in DS flies is reflected in their relatively high displacement and walking speed compared to control and mutant flies. Our novel method manipulates humidity cues to create complex humidity landscapes that respond in real-time to insect movement. This will help us shed light on how humidity shapes behaviour and offers a foundation for further research in the field of hygrosensation.

neuroscience↗

bioRxiv2023

Genetic atlas of hygro- and thermosensory cells in the vinegar fly Drosophila melanogaster

The ability of animals to perceive and respond to sensory information is essential for their survival in diverse environments. While much progress has been made in understanding various sensory modalities, the sense of hygrosensation, which involves the detection and response to humidity, remains poorly understood. In this study, we focused on the hygrosensory, and closely related thermosensory, systems in the vinegar fly Drosophila melanogaster to unravel the molecular profile of the cells of these senses. Using a transcriptomic analysis of over 37,000 nuclei, we identified twelve distinct clusters of cells corresponding to temperature-sensing arista neurons, humidity-sensing sacculus neurons, and support cells relating to these neurons. By examining the expression of known and novel marker genes, we validated the identity of these clusters and characterized their gene expression profiles. We found that each cell type could be characterized by a unique expression profile of ion channels, GPCR signaling molecules, synaptic vesicle cycle proteins, and cell adhesion molecules. Our findings provide valuable insights into the molecular basis of hygro- and thermosensation. Understanding the mechanisms underlying hygro- and thermosensation may shed light on the broader understanding of sensory systems and their adaptation to different environmental conditions in animals.

neuroscience↗