Gene · BEGINNER LESSON

MAPT

MAPT is a human gene that encodes tau, a microtubule-associated protein. In the sources, it is studied because changes in its regulation or mutations are linked to tau-related neurodegenerative disease.

AI-assisted lesson · Public sources · Updated 2026-10-12

What MAPT is

MAPT is the gene that encodes tau, a microtubule-associated protein. Tau helps with microtubules, which are internal cell structures that support cell shape and transport. In the sources, MAPT is important because altered MAPT activity is linked to tauopathies, a group of diseases marked by tau dysfunction and aggregation.

What researchers measure

The sources measure MAPT-related biology in several ways: whether DNA variants increase or decrease regulatory activity, whether promoter sequences act as cis-regulatory elements (CREs), and whether changes are specific to certain cell types such as neurons. They also measure disease-related outcomes such as tau pathology, neurofibrillary tangles, and neuroinflammation.

[2] Promoter mutagenesis and a massively parallel reporter ... [3] Promoter mutagenesis and a massively parallel reporter screen of the MAPT locus identifies cis-regulatory elements and genetic variation effects - PubMed [1] pmc.ncbi.nlm.nih.gov › articles › PMC12651759The cGAS–STING Pathway in Dementia: An Emerging Mechanism of ...

How MAPT is connected to disease

Tau dysregulation is described as important in progressive supranuclear palsy, frontotemporal dementia, and Alzheimer’s disease. In Alzheimer’s disease, tau can become hyperphosphorylated, meaning it carries too many phosphate groups, and then form neurofibrillary tangles, which are clumps associated with cell death. In frontotemporal dementia, MAPT mutations are reported to promote tau pathology and a reactive microglial state, meaning microglia switch into an inflammatory activation pattern.

[2] Promoter mutagenesis and a massively parallel reporter ... [1] pmc.ncbi.nlm.nih.gov › articles › PMC12651759The cGAS–STING Pathway in Dementia: An Emerging Mechanism of ...

How regulation was studied

One study screened about a 3 megabase region around the MAPT locus, which is the chromosomal neighborhood containing the gene, using massively parallel reporter assays (MPRAs). An MPRA is a lab method that tests many DNA sequences at once by linking them to a reporter readout, so researchers can compare which sequences raise or lower regulatory activity. The study found many cell-type-specific CREs and many promoter variants with increased or decreased activity in neurons.

Limitations of the evidence

The regulatory findings were generated in a limited set of cell types, mainly H1 haplotype cells, excitatory neurons, HEK293FT cells, and mixed neuron cultures. The study did not directly test how the variants change MAPT expression in living cells in a complete causal way, and the authors note that results could differ in H2 haplotype cells. The sources are preprints or preprint-based summaries, so the evidence should be treated as early rather than final.

SEE THE IDEA

MAPT from DNA to disease-linked effects

01MAPT gene

DNA sequence that encodes tau

02Regulatory DNA

Promoter and cis-regulatory elements can raise or lower activity

03Tau protein

Product encoded by MAPT; can become abnormal when dysregulated

04Disease-linked change

Tangles, tau pathology, and inflammatory responses

MAPT is regulated by nearby DNA elements; altered regulation can change tau-related biology and contribute to disease-associated processes.

A simple path from MAPT DNA regulation to tau-related effects described in the sources.

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0 of 3 questions answered

01 What does MAPT encode in the sources?

02 A researcher tests many MAPT promoter variants in neurons and gets a reporter signal for each sequence. What method is this most like?

03 A variant increases reporter activity in neurons but was never tested for its direct effect on MAPT expression in living cells. What is the safest conclusion?

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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.

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