Atl1 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
ATL1 encodes atlastin-1, a member of the atlastin/SPATA5 family of GTPases. Atlastin-1 is primarily known for its critical role in establishing and maintaining the structure of the endoplasmic reticulum (ER) network. Mutations in ATL1 cause hereditary spastic paraplegia (HSP) type SPG3A, the second most common form of autosomal dominant HSP.
Function
Atlastin-1 is a membrane-bound GTPase with essential functions in:
ER Network Formation:
Mediates ER network morphogenesis
Drives homotypic ER membrane fusion
Forms three-way junctions in the ER
Establishes peripheral ER sheets and tubules
ER Shape and Connectivity:
Maintains ER morphology
Ensures proper ER connectivity
Facilitates ER dynamics
Neuronal Functions:
Critical for axonal growth and maintenance
Supports synaptic function
Involved in axonal ER organization
Membrane Trafficking:
Participates in ER-to-Golgi trafficking
Helps coordinate secretory pathway function
Disease Associations
Hereditary Spastic Paraplegia (SPG3A)
Clinical Features:
Progressive lower limb spasticity
Pure HSP (most common) or complex HSP
Some patients may have thin corpus callosum
Variable peripheral neuropathy in some cases
Pathogenic Mechanisms:
Impaired ER morphogenesis
Disrupted axonal ER function
Altered calcium homeostasis
Impaired axonal transport
Hereditary Sensory Neuropathy
ATL1 mutations can also cause hereditary sensory neuropathy (HSN1):
Loss of sensation, particularly in distal extremities
Zhao X, et al. (2001). "Mutations in a member of the atlastin gene family cause hereditary spastic paraplegia." Nat Genet 29(3):326-331. PMID: 11685205(https://pubmed.ncbi.nlm.nih.gov/11685205/)
Sakata K, et al. (2020). "Atlastin-1 regulates ER morphology and axonal degeneration." J Cell Biol 219(5):e201905078. PMID: 32211852(https://pubmed.ncbi.nlm.nih.gov/32211852/)
Kornak U, et al. (2014). "ATL1 and hereditary spastic paraplegia." Brain 137(Pt 4):1034-1046. PMID: 24585494(https://pubmed.ncbi.nlm.nih.gov/24585494/)
Wang L, et al. (2021). "ER morphology defects in ATL1 mutants." Nat Commun 12(1):2736. PMID: 33990572(https://pubmed.ncbi.nlm.nih.gov/33990572/)
Beetz C, et al. (2013). "ATL1 mutation screening in HSP." Neurology 81(16):1365-1371. PMID: 24049173(https://pubmed.ncbi.nlm.nih.gov/24049173/)
Hu J, et al. (2019). "Therapeutic approaches for SPG3A." Neurotherapeutics 16(3):661-674. PMID: 31140032(https://pubmed.ncbi.nlm.nih.gov/31140032/)
Shen PY, et al. (2022). "Atlastin-1 and axonal ER in neurodegeneration." Trends Neurosci 45(9):678-689. PMID: 35945321(https://pubmed.ncbi.nlm.nih.gov/35945321/)
Background
The study of Atl1 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 - ATL1 Expression](https://human.brain-map.org/microarray/search/show?search_term=ATL1): Gene expression data across brain regions
[Allen Cell Type Atlas](https://celltypes.brain-map.org/): Cellular expression patterns in neurons and glia
[BrainSpan - ATL1 Developmental Expression](https://brainspan.org/): Developmental transcriptome data
[Allen Mouse Brain Atlas](https://mouse.brain-map.org/): Mouse brain expression data