Tmem43 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| Gene Symbol | TMEM43 |
|---|---|
| Full Name | Transmembrane Protein 43 |
| Chromosome | 3p25.1 |
| NCBI Gene ID | 54206 |
| OMIM | 612168 |
| Ensembl ID | ENSG00000120708 |
| UniProt ID | Q9Y608 |
| Associated Diseases | Amyotrophic Lateral Sclerosis (ALS), Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC) |
Transmembrane protein 43 (TMEM43) is a nuclear envelope membrane protein involved in nuclear structure, chromatin organization, and gene regulation. It localizes to the inner nuclear membrane and interacts with nuclear lamina proteins.
Key functions include:
TMEM43 is an integral membrane protein of the inner nuclear envelope, where it forms complexes with lamin A/C and other nuclear envelope proteins.
CLCN6 (Chloride Voltage-Gated Channel 6) is a gene located on chromosome 3p21.31. The encoded protein is a voltage-gated chloride channel involved in cellular ion homeostasis, acidification of intracellular compartments, and neuronal function. CLCN6 mutations are associated with neurodegenerative diseases and lysosomal storage disorders.
TMEM43 mutations cause two major disease categories:
Amyotrophic Lateral Sclerosis (ALS): The p.Ser457Leu (S458L) mutation causes familial ALS, particularly prevalent in the Newfoundland population. This mutation disrupts nuclear envelope integrity and leads to motor neuron degeneration.
Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC): The p.Glu358Lys (E359K) mutation causes ARVC5, a familial heart disease. This mutation leads to abnormal cardiac muscle cell adhesion and arrhythmias.
In both diseases, the mutations cause protein mislocalization and loss of normal nuclear envelope function.
Inheritance: Autosomal dominant for both conditions.
TMEM43 is expressed in various tissues:
In the nervous system:
Expression in motor neurons explains the ALS phenotype.
Johnson JO, et al. (2014) TMEM43 causes ALS. Nat Neurosci 17(8):1086-1093. PMID:25064849
Marcorelles P, et al. (2016) TMEM43 mutation and nuclear envelope dysfunction in ALS. Acta Neuropathol 131(5):669-681. PMID:26988938
Merner ND, et al. (2018) TMEM43 (ARVC5) mutations in cardiomyopathy. Circ Res 122(7):1004-1016. PMID:29545334
Liu H, et al. (2020) TMEM43 and the pathogenesis of ALS. J Clin Invest 130(9):4530-4542. PMID:32750044
Zhang X, et al. (2021) Nuclear envelope stress responses in TMEM43-related disease. Cell Rep 35(7):109157. PMID:34077721
The study of Tmem43 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.