Trpm1 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infobox-gene"> [@miller2010] <span class="infobox-title">TRPM1 Gene</span> [@koike2011] | Property | Value | [@devi2018] |----------|-------| [@sheng2020] | Gene Symbol | TRPM1 | | Full Name | Transient Receptor Potential Cation Channel Subfamily M Member 1 (Melastatin-1) | | Chromosomal Location | 15q21.2 | | NCBI Gene ID | 4300 | | OMIM ID | 603446 | | Ensembl ID | ENSG00000144306 | | UniProt ID | Q9Y5H5 | | Associated Diseases | Visual Impairment, Melanoma, Congenital Stationary Night Blindness | </div>
Overview
TRPM1 (Transient Receptor Potential Cation Channel Subfamily M Member 1), also known as melastatin-1, is a non-selective calcium-permeable cation channel. It was originally identified as a tumor suppressor in melanoma and is now known to be essential for proper visual function in the retina. TRPM1 represents a unique connection between visual processing and melanoma biology, bridging the fields of sensory neuroscience and cancer biology. Loss of TRPM1 expression is associated with melanoma progression and metastasis, while mutations cause congenital stationary night blindness.
Normal Function
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TRPM1 Gene
Introduction
Trpm1 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infobox-gene"> [@miller2010] <span class="infobox-title">TRPM1 Gene</span> [@koike2011] | Property | Value | [@devi2018] |----------|-------| [@sheng2020] | Gene Symbol | TRPM1 | | Full Name | Transient Receptor Potential Cation Channel Subfamily M Member 1 (Melastatin-1) | | Chromosomal Location | 15q21.2 | | NCBI Gene ID | 4300 | | OMIM ID | 603446 | | Ensembl ID | ENSG00000144306 | | UniProt ID | Q9Y5H5 | | Associated Diseases | Visual Impairment, Melanoma, Congenital Stationary Night Blindness | </div>
Overview
TRPM1 (Transient Receptor Potential Cation Channel Subfamily M Member 1), also known as melastatin-1, is a non-selective calcium-permeable cation channel. It was originally identified as a tumor suppressor in melanoma and is now known to be essential for proper visual function in the retina. TRPM1 represents a unique connection between visual processing and melanoma biology, bridging the fields of sensory neuroscience and cancer biology. Loss of TRPM1 expression is associated with melanoma progression and metastasis, while mutations cause congenital stationary night blindness.
Normal Function
TRPM1 functions as:
Calcium-permeable channel: Allows Ca2+ and Na+ influx, important for second messenger signaling
Tumor suppressor: Expression lost in metastatic melanoma, correlates with prognosis
ON-bipolar cell channel: Essential for phototransduction in retinal ON-bipolar cells
Skin pigmentation regulator: Controls melanosome trafficking in melanocytes
Retinal Function
In the retina, TRPM1 is expressed in ON-bipolar cells where it:
Receives synaptic input from photoreceptors via glutamate release
Generates depolarizing responses to light onset (ON responses)
Is essential for the ON pathway of visual processing
Forms the primary pathway for daylight (photopic) vision
Couples to downstream signaling cascades via calcium influx
Channel Properties
TRPM1 channel characteristics:
Conductance: ~100 pS for Ca2+, non-selective cation channel
Activation: Voltage-dependent with intracellular Ca2+ modulation
Selectivity: Permeable to Ca2+, Na+, Mg2+, modest selectivity for Ca2+
Regulation: Phosphorylation, protein interactions, membrane trafficking
Splice variants: Multiple isoforms with tissue-specific distribution
Gene Structure
The TRPM1 gene is located on chromosome 15q21.2 and encodes a 1865-amino acid transmembrane protein. The gene contains 27 exons and undergoes extensive alternative splicing, producing multiple isoforms with distinct expression patterns and functional properties.
Protein Topology
TRPM1 contains:
N-terminal region: Multiple ankyrin repeat domains for protein interactions
Transmembrane segments: Six transmembrane helices (S1-S6)
Pore loop: Between S5 and S6, determines ion selectivity
C-terminal region: Contains regulatory domains and interaction sites
Disease Associations
Congenital Stationary Night Blindness (CSNB)
TRPM1 mutations cause CSNB:
Autosomal recessive inheritance: Both alleles affected
Complete CSNB: Associated with complete loss of TRPM1 function
Electroretinogram findings: Severely reduced or absent rod responses
Visual acuity: Typically normal daytime vision
Melanoma
TRPM1 in cancer:
Tumor suppressor: Lost in aggressive melanoma
Metastasis marker: Low TRPM1 = worse prognosis
Therapeutic target: Restoring expression as approach
Mechanism: Controls cell proliferation and survival
The study of Trpm1 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Brain Atlas Resources
[Allen Human Brain Atlas - TRPM1 Expression](https://human.brain-map.org/microarray/search/show?search_term=TRPM1) — Gene expression data across human brain regions](/datasets/allen-human-brain-atlas)
[Allen Cell Type Atlas - TRPM1](https://celltype.brain-map.org/) — Single-cell expression data