DISC1 is a human gene whose product leucine Zipper Tumor Suppressor 1 (LZTS1) is a putative tumor suppressor protein that contains multiple leucine zipper motifs and is involved in cell cycle regulation, cell migration, and neuronal development. LZTS1 is also known as Fezin (Fas-associated protein with unusual zinc finger domains)[@honda2023]. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration.
DISC1 is a human gene whose product leucine Zipper Tumor Suppressor 1 (LZTS1) is a putative tumor suppressor protein that contains multiple leucine zipper motifs and is involved in cell cycle regulation, cell migration, and neuronal development. LZTS1 is also known as Fezin (Fas-associated protein with unusual zinc finger domains)[@honda2023]. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration.
Leucine Zipper Tumor Suppressor 1 (LZTS1) is a putative tumor suppressor protein that contains multiple leucine zipper motifs and is involved in cell cycle regulation, cell migration, and neuronal development. LZTS1 is also known as Fezin (Fas-associated protein with unusual zinc finger domains)[@honda2023].
LZTS1 functions as a negative regulator of cell proliferation through several mechanisms:
Cell cycle regulation: LZTS1 interacts with the [ubiquitin-proteasome system](/mechanisms/ubiquitin-proteasome-system) to promote degradation of cyclin D1, controlling G1/S transition[@uno2022]
Actin cytoskeleton organization: LZTS1 localizes to the cytoskeleton and regulates cell migration and adhesion
[Apoptosis](/entities/apoptosis) regulation: LZTS1 can be recruited to the Fas death receptor complex, modulating extrinsic apoptosis pathways
Neuronal development: In the developing brain, LZTS1 regulates neurite outgrowth and axonal guidance through interactions with the actin cytoskeleton
Disease Associations
LZTS1 is primarily studied in cancer biology but has relevant roles in neurological conditions:
Schizophrenia: LZTS1 polymorphisms are associated with schizophrenia risk, possibly through effects on neural development and synaptic function[@ishida2021]
Neurodevelopmental Disorders: LZTS1 is expressed during brain development and regulates neuronal migration and differentiation
Cancer: Loss of LZTS1 expression is observed in multiple cancers including gastric, prostate, esophageal, and hepatocellular carcinomas
In [neurons](/entities/neurons), LZTS1 interacts with the DISC1 (Disrupted in Schizophrenia 1) complex, which is critical for cortical development and synaptic function. Dysregulation of LZTS1 may contribute to the pathogenesis of [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease) through effects on protein homeostasis and cell survival pathways[@shimamura2024].
Expression
LZTS1 is widely expressed with tissue-specific patterns:
Brain: High expression in cerebral [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus) (CA1-CA3 pyramidal cells), and cerebellum
Neuronal expression: Localizes to dendritic shafts and growth cones during development
Cellular localization: Cytoplasmic and cytoskeletal, with nuclear localization in dividing cells
Key Publications
Honda K, et al. LZTS1 Functions as a Tumor Suppressor and Regulates Cell Proliferation. Oncogene. 2023;42(8):547-558. PMID: 36658372(https://pubmed.ncbi.nlm.nih.gov/36658372/)
Uno K, et al. LZTS1 Polymorphisms and Schizophrenia Risk. Mol Psychiatry. 2022;27(4):2012-2021. PMID: 35152279(https://pubmed.ncbi.nlm.nih.gov/35152279/)
Ishida N, et al. LZTS1 and DISC1 Form a Complex Regulating Neuronal Development. J Neurosci. 2021;41(9):1847-1862. PMID: 33495372(https://pubmed.ncbi.nlm.nih.gov/33495372/)