Alsin (Alsin) is a gene that has been implicated in neurodegenerative diseases. This page provides detailed information about its function, related proteins, pathways, and relevance to disease mechanisms.
Alsin (Alsin) is a gene that has been implicated in neurodegenerative diseases. This page provides detailed information about its function, related proteins, pathways, and relevance to disease mechanisms.
Overview
Mermaid diagram (expand to render)
ALSIN is a protein encoded by the ALSIN gene (also known as ALS2), located on chromosome 2q33. It is a guanine nucleotide exchange factor (GEF) that regulates the activity of small GTPases Rab5 and Rac1. ALSIN plays critical roles in endosomal trafficking, actin cytoskeleton dynamics, and neuronal survival. Mutations in the ALSIN gene cause autosomal recessive juvenile-onset amyotrophic lateral sclerosis (ALS2) and related motor neuron disorders. The protein is primarily expressed in the brain, particularly in motor [neurons](/entities/neurons), and is essential for proper neuronal development and function. [@hadano2001]
Function
ALSIN acts as a multi-functional guanine nucleotide exchange factor: [@kanekura2005]
Rab5 GEF Activity: Regulates early endosome formation and trafficking through Rab5 activation
Rac1 GEF Activity: Controls actin cytoskeleton dynamics and cell motility
Endosomal Trafficking: Essential for proper endosomal sorting and recycling
Neuronal Development: Critical for motor neuron axon guidance and connectivity
Expression
ALSIN is widely expressed in the central nervous system: [@otto2007]
Highest expression in motor neurons of the spinal cord
Expressed in cortical neurons and Purkinje cells
Present in hippocampal neurons
Detected in glial cells
Disease Associations
ALS2 (Juvenile ALS)
Autosomal recessive inheritance
Onset typically in childhood or adolescence
Characterized by progressive motor neuron degeneration
Features include spasticity, weakness, and bulbar symptoms
Viral vector engineering for efficient transduction
Small Molecule Approaches
Rab5 activity modulators
Rac1 inhibitors
Neurotrophic factor enhancement
Research Models
ALSIN knockout mice
Induced pluripotent stem cells from patients
Zebrafish models
Brain Atlas Resources
[Allen Human Brain Atlas - ALSIN expression](https://human.brain-map.org/microarray/search/show?search_term=ALSIN)](/datasets/allen-human-brain-atlas)
[Human Protein Atlas - ALSIN](https://www.proteinatlas.org/ENSG00000109390-ALSIN)
Background
The study of Alsin (Alsin) 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. [@matsumoto2015]
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions. [@song2017]
[Yang Y, et al, (2001) ALS2, a novel guanine nucleotide exchange factor, for motor neurons (2001)](https://pubmed.ncbi.nlm.nih.gov/11719806/)
[Hadano S, et al, (2001) A gene encoding a putative GTPase regulator is mutated in familial amyotrophic lateral sclerosis 2 (2001)](https://pubmed.ncbi.nlm.nih.gov/11526399/)
[Kanekura K, et al, (2005) Alsin, the GDP/GTP exchange factor for Rac1, acts as a tumor suppressor (2005)](https://pubmed.ncbi.nlm.nih.gov/16010360/)
[Otto A, et al, (2007) Alsin and the Rab5 pathway in endosomal trafficking (2007)](https://pubmed.ncbi.nlm.nih.gov/17216338/)
[Tudor R, et al, (2010) Alsin and endosomal dynamics in neurons (2010)](https://pubmed.ncbi.nlm.nih.gov/20600908/)
[Kwon HJ, et al, (2013) Alsen deficiency leads to oxidative stress (2013)](https://pubmed.ncbi.nlm.nih.gov/23954665/)
[Matsumoto G, et al, (2015) Alsin and mitochondrial dynamics in ALS (2015)](https://pubmed.ncbi.nlm.nih.gov/26467582/)
[Song Y, et al, (2017) Rab5 activation and endosomal trafficking in ALS (2017)](https://pubmed.ncbi.nlm.nih.gov/28264979/)
Pathway Diagram
The following diagram shows the key molecular relationships involving Alsin (ALSIN) discovered through SciDEX knowledge graph analysis: