| Chromosomal Location | 1p36.
The TARDBP gene encodes the TDP-43 protein, a highly conserved RNA/DNA-binding protein that plays crucial roles in RNA metabolism:
- RNA splicing: TDP-43 regulates alternative splicing of numerous pre-mRNAs
- RNA transport: Involved in mRNA trafficking and localization
- RNA stability: Regulates mRNA stability and translation
- Transcription regulation: Can act as a transcriptional repressor
- Stress granules: Localizes to stress granules under cellular stress
TDP-43 contains an N-terminal domain, an RNA recognition motif (RRM) in the middle region, and a C-terminal glycine-rich domain that mediates protein-protein interactions. The protein is predominantly nuclear but can shuttle between nucleus and cytoplasm.
- Inheritance: Autosomal dominant ( mutations)
- mostMechanism: Over 50 mutations in TARDBP cause ALS, predominantly in the C-terminal glycine-rich domain
- Pathogenesis:
- Cytoplasmic TDP-43 aggregation (pathological hallmark in >95% of ALS cases)
- Loss of nuclear TDP-43 function
- Impaired RNA metabolism
- Toxic gain-of-function from aggregates
- Overlap with FTD: TDP-43 pathology is common to both ALS and FTD
- Inheritance: Some mutations cause FTD without ALS
- Pathology: TDP-43 inclusions in frontotemporal cortex
- FTLD-TDP: Subtype of FTLD characterized by TDP-43 pathology
- Some TARDBP mutations associated with PDB
- Possibly related to altered RNA metabolism in osteoclasts
- High expression: Brain (cortex, hippocampus, spinal cord), muscle, testis
- Cellular localization: Predominantly nuclear in healthy cells
- Regional specificity: High in motor neurons - particularly vulnerable in ALS
- Allen Brain Atlas: High expression in layer 5 pyramidal neurons
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Sreedharan J, et al. (2008). "TDP-43 mutations in familial and sporadic amyotrophic lateral sclerosis." Science. PMID:18801997. DOI:10.1126/science.1166066
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Neumann M, et al. (2006). "Ubiquitinated TDP-43 in frontotemporal lobar degeneration and amyotrophic lateral sclerosis." Science. PMID:16400152. DOI:10.1126/science.1124108
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Buratti E, et al. (2001). "Nuclear factor TDP-43 and SR proteins modulate in vitro alternative splicing of APP pre-mRNA." Nucleic Acids Res. PMID:11266564
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Chen-Plotkin AS, et al. (2010). "TDP-43 in neurodegenerative disorders." Nat Rev Neurol. PMID:20200514
The study of Tardbp 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.
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- 1 Neumann M, et al. (2006). Ubiquitinated TDP-43 in frontotemporal lobar degeneration and amyotrophic lateral sclerosis. Science. PMID:16400152.
- 2 Buratti E, et al. (2001). Nuclear factor TDP-43 and SR proteins modulate in vitro alternative splicing of APP pre-mRNA. Nucleic Acids Res. PMID:11266564.
- 3 Chen-Plotkin AS, et al. (2010). TDP-43 in neurodegenerative disorders. Nat Rev Neurol. PMID:20200514.
- 4 Lagier-Tourenne C, et al. (2010). TDP-43 and FUS in amyotrophic lateral sclerosis. J Mol Neurosci. PMID:20617440.
- 5 Arai T, et al. (2006). TDP-43 is a component of ubiquitin-positive tau-negative inclusions in frontotemporal lobar degeneration and amyotrophic lateral sclerosis. Biochem Biophys Res Commun. PMID:16530386.
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