Genetics of Sensory Dysfunction

Sensory dysfunction encompasses altered pain processing, sensory hypersensitivity, anosmia, and dysautonomia-related sensory symptoms. Genetic variants in sensory receptor, ion channel, and central pain processing genes may influence sensory thresholds and chronic sensitisation.

This page is for educational and informational purposes only. Not a diagnostic tool. Always consult a qualified healthcare provider.

What is Sensory Dysfunction?

Sensory dysfunction in Long COVID and ME/CFS includes anosmia/parosmia (smell disorders), hyperalgesia (increased pain sensitivity), allodynia (pain from non-painful stimuli), photophobia, phonophobia, and postural sensory instability. Central sensitisation — persistent amplification of sensory signals in the CNS — is increasingly recognised as a mechanism in ME/CFS and fibromyalgia. Genetic variants in TRPV1 (pain receptor), SCN9A (Nav1.7 sodium channel), and COMT (catecholamine metabolism affecting pain processing) have been studied in chronic pain and sensory disorders. ACE2 expression in olfactory epithelium underlies COVID-19 anosmia.

Biological pathways commonly discussed in relation to Sensory Dysfunction

Research into Sensory Processing Dysfunction and Neurological Sensitivities has highlighted several biological pathways that may be relevant. Genetic variants within these pathways may influence individual susceptibility, symptom severity, or the trajectory of the condition.

Pain Processing

Pain signals are transduced by nociceptors expressing TRPV1 (capsaicin receptor), TRPA1, and P2X3 channels, conducted via Nav1.7 (SCN9A) sodium channels, and modulated by descending noradrenergic and serotonergic systems. Variants in SCN9A cause extreme pain syndromes (gain-of-function) or congenital insensitivity to pain (loss-of-function).

Olfactory Function

Olfactory receptor neurons express ACE2 and TMPRSS2, making them vulnerable to SARS-CoV-2 infection. OMP (olfactory marker protein) and olfactory receptor genes (olfactory receptor gene family, ~400 functional genes) determine olfactory acuity. COVID-19 anosmia reflects olfactory support cell infection, not direct neuronal damage.

Ion Channel Function

Voltage-gated sodium, potassium, and calcium channels (SCN9A, KCNQ2/3, CACNA1A) regulate neuronal excitability. Variants in these channels can cause channelopathies with pain, epilepsy, or paralysis phenotypes. Acquired channelopathy from autoantibodies has been proposed in Long COVID.

Central Sensitisation

Central sensitisation involves NMDA receptor (GRIN2B) upregulation, reduced GABAergic inhibition, and descending pain modulation changes. Genetic variants affecting serotonin (SLC6A4), catecholamine (COMT), and opioid receptor (OPRM1) function influence central pain processing and sensitisation risk.

Key genes studied in relation to Sensory Dysfunction

The following genes have been studied in relation to Sensory Processing Dysfunction and Neurological Sensitivities. These genes span the biological pathways most commonly discussed in this area of research.

TRPV1

TRPV1 encodes a non-selective cation channel activated by heat, capsaicin, and pro-inflammatory mediators, central to pain transduction.

TRPA1

TRPA1 encodes a non-selective cation channel activated by cold, chemical irritants, and inflammatory mediators.

IL31

IL31 encodes interleukin-31, a pruritogenic cytokine that signals through dermal sensory neurons to induce itch and skin inflammation.

P2RX3

P2RX3 encodes the P2X3 receptor, an ATP-gated ion channel on sensory neurons critical for chronic cough and pain sensitization.

PIEZO2

PIEZO2 encodes a mechanosensitive ion channel in sensory neurons essential for proprioception, touch discrimination, and pain.

Genetic variants commonly discussed

The following genetic variants (SNPs) are found in genes that have been studied in relation to Sensory Dysfunction. Each variant represents a position in the genome where individuals may carry different alleles.

rs8065080TRPV1 rs222747TRPV1 rs11988795TRPA1 rs13255063TRPA1 rs7977932IL31 rs58124085P2RX3

9 variants total across genes studied in relation to Sensory Dysfunction.

How personal DNA data may provide educational insights

Consumer DNA files from 23andMe, AncestryDNA, and MyHeritage contain raw SNP data. When you upload your file to ChronicDNA, the analysis engine checks your genotype against a curated panel of 80+ genes selected for their relevance to Long COVID, ME/CFS, and connected biological pathways - some of which may relate to areas such as Sensory Dysfunction.

This is not a diagnostic service. Genetic variants do not determine whether you have Sensory Dysfunction, nor do they predict your clinical outcomes. The report is educational - it explains which variants you carry, what the research says about them, and how they fit into the biological pathways most relevant to chronic illness. All results should be discussed with a qualified healthcare provider.

Related conditions and pathways

Sensory Dysfunction shares biological pathways and genetic associations with the following related conditions and areas of research.

Pots Autonomic Dysfunction Chronic Fatigue Inflammation Anxiety

Frequently asked questions

Why do Long COVID patients develop anosmia and parosmia?

SARS-CoV-2 infects olfactory support cells (sustentacular cells) expressing high ACE2 and TMPRSS2, disrupting olfactory receptor neuron function. Parosmia (distorted smell) during recovery may reflect misrouted olfactory neuron regeneration. Genetic variation in olfactory receptor genes and ACE2 expression in olfactory epithelium may influence susceptibility and recovery.

What is central sensitisation and how does it relate to ME/CFS?

Central sensitisation is a state of amplified spinal and brain sensory processing in which normally sub-threshold stimuli trigger pain or discomfort. It has been documented in fibromyalgia and ME/CFS. Variants affecting descending pain inhibition (COMT, SLC6A4, OPRM1) may predispose to central sensitisation development after viral illness.

What is the SCN9A gene and why is it relevant to pain?

SCN9A encodes Nav1.7, the primary voltage-gated sodium channel in peripheral nociceptors. Gain-of-function variants cause inherited erythromelalgia and paroxysmal extreme pain disorder. Loss-of-function variants cause congenital insensitivity to pain. Common variants modulate pain sensitivity across the general population.

Which sensory dysfunction genes are studied?

Key genes include SCN9A, TRPV1, TRPA1, COMT, SLC6A4, OPRM1, GRIN2B, KCNQ3, and CACNA1A. These cover peripheral nociception, ion channel function, central pain modulation, and serotonergic/catecholaminergic pain regulation.

Explore DNA insights

If you already have DNA data from 23andMe, AncestryDNA, or MyHeritage, upload your raw file to ChronicDNA and receive a personalised educational report covering genes studied in relation to Sensory Dysfunction and connected biological pathways.

Get Your Personalised DNA Report

Informational and educational only · Not a diagnostic tool · GDPR compliant

5 genes · 9 variants analysed in relation to Sensory Dysfunction