Gene and RNA-binding protein · BEGINNER LESSON
TARDBP
TARDBP is a human gene that encodes the protein TDP-43, an RNA- and DNA-binding protein. In cells, it is measured by its gene or protein level, location, binding activity, and effects on RNA processing and disease-related behavior.
What it is
TARDBP is the gene that encodes TAR DNA-binding protein 43, usually called TDP-43. TDP-43 is a protein that binds RNA and DNA and is mainly found in the cell nucleus, where it helps control RNA metabolism. RNA metabolism means the making, processing, transport, stability, and translation of RNA, the molecule that carries genetic instructions from DNA to make proteins.
[1] TARDBP as a regulator of HIV-1 assembly and infection - PMC [2] TDP-43: unveiling the hidden key to cellular fate decisions [3] What can we learn on ALS pathophysiology from iPSC-derived ...
What it does in cells
TDP-43 helps manage many RNA-related steps, including alternative splicing, RNA transport, RNA stability, translation, and processing of small non-coding RNAs. It recognizes UG-rich RNA sequences, so one protein can influence many transcripts. The protein has RNA recognition motifs, or RRMs, which are parts that bind RNA directly.
[1] TARDBP as a regulator of HIV-1 assembly and infection - PMC [2] TDP-43: unveiling the hidden key to cellular fate decisions
How it can affect HIV-1
In HIV-1, TDP-43 acts as a host factor that restricts the virus in two ways. First, it raises HDAC6, which promotes autophagic degradation of viral proteins such as Pr55Gag and Vif, reducing virus assembly and infectivity. Second, it affects microtubule deacetylation through HDAC6, which can block viral entry at a pore-fusion step in target cells. Autophagy is the cell’s recycling system that breaks down unwanted material.
[1] TARDBP as a regulator of HIV-1 assembly and infection - PMC
Why mutations matter
TARDBP mutations are linked to abnormal TDP-43 behavior in amyotrophic lateral sclerosis, or ALS, a disease that damages motor neurons. In reported studies, mutant TDP-43 can become hyperphosphorylated, cleaved, and aggregated in cells. These changes are associated with disrupted RNA metabolism, stress sensitivity, reduced cell survival, and abnormal electrical activity in motor-neuron models.
[2] TDP-43: unveiling the hidden key to cellular fate decisions [3] What can we learn on ALS pathophysiology from iPSC-derived ...
Limits and cautions
TDP-43 biology is complex. A result seen in one model, such as HIV-1-infected cells or induced motor neurons, does not prove the same effect in every tissue or disease. Some findings are based on overexpression or knockdown experiments, which change protein amounts artificially. Also, not all disease features in laboratory models match the full disease state seen in patients.
[1] TARDBP as a regulator of HIV-1 assembly and infection - PMC [3] What can we learn on ALS pathophysiology from iPSC-derived ...
SEE THE IDEA
TARDBP / TDP-43 in cells
DNA sequence that encodes the protein TDP-43
RNA/DNA-binding protein that acts mainly in the nucleus
Splicing, transport, stability, and translation control
Can restrict HIV-1 or become abnormal in ALS
TARDBP encodes TDP-43, which regulates RNA processing and can either restrict HIV-1 or become dysfunctional in disease models.
The gene produces a binding protein that influences RNA behavior and downstream cell outcomes.
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Sources and further reading
This general lesson was generated from public source material. It explains a concept; it does not interpret a private paper or provide medical advice.