Pathway candidateNCBI-verifiedprotein-coding

HTR5A

5-hydroxytryptamine receptor 5A

NCBI Gene: 3361 Ensembl GeneCards UniProt: P47898

Pathway candidate — not linked to PFS or PSSD by any record here

HTR5A is in the library because it belongs to the neurotransmission family. No study, report or commentary in the corpus names it, so a variant in HTR5A is not, by itself, evidence of anything related to post-drug syndromes.

Gene summary

A protein-coding gene on chromosome 7 (neurotransmission). The neurotransmitter serotonin (5-hydroxytryptamine, 5-HT) has been implicated in a wide range of psychiatric conditions and also has vasoconstrictive and vasodilatory effects. The gene described in this record is a member of 5-hydroxytryptamine (serotonin) receptor family and encodes a multi-pass membrane protein that functions as a receptor for 5-hydroxytryptamine and couples to G-proteins.

Source: NCBI Gene, accessed 2026-10-07.

Protein reference (UniProt)

Protein: 5-hydroxytryptamine receptor 5A
Function: G protein-coupled receptor for 5-hydroxytryptamine (serotonin), a biogenic hormone that functions as a neurotransmitter, a hormone and a mitogen. Also functions as a receptor for ergot alkaloid derivatives and other psychoactive substances. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of downstream effectors. HTR5A is coupled to G(i)/G(o) G alpha proteins and mediates inhibitory neurotransmission: signaling inhibits adenylate cyclase activity and activates a phosphatidylinositol-calcium second messenger system that regulates the release of Ca(2+) ions from intracellular stores.
Subcellular location: Cell membrane.

Source: UniProtKB/Swiss-Prot P47898, release 2026_03, licensed CC BY 4.0. This is the protein’s normal biology, not evidence about post-drug syndromes; associated conditions are inherited disorders of the gene, not PFS, PSSD or PRSD.

Why its pathway is in the library

Monoamine, GABA, glutamate, and cholinergic systems are the direct pharmacologic targets of SSRIs/SNRIs (PSSD) and the downstream effectors of neurosteroid signaling (PFS).

Written for the whole neurotransmission family, not for HTR5A specifically.

Mentioned in 0 corpus records

No corpus record names HTR5A directly yet. It is in the library because it sits in a pathway the corpus tracks (Neurotransmission).

Also in neurotransmission

All 54 genes

Browse by family on the gene families page.

Gene summary

Source: NCBI Gene, accessed 2026-10-07.

Protein reference (UniProt)

Protein: 5-hydroxytryptamine receptor 5A
Function: G protein-coupled receptor for 5-hydroxytryptamine (serotonin), a biogenic hormone that functions as a neurotransmitter, a hormone and a mitogen. Also functions as a receptor for ergot alkaloid derivatives and other psychoactive substances. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of downstream effectors. HTR5A is coupled to G(i)/G(o) G alpha proteins and mediates inhibitory neurotransmission: signaling inhibits adenylate cyclase activity and activates a phosphatidylinositol-calcium second messenger system that regulates the release of Ca(2+) ions from intracellular stores.
Subcellular location: Cell membrane.