MAPT Haplotypes and Tau Biology in Neurodegeneration
The microtubule-associated protein tau (MAPT) gene encodes tau, whose aggregation defines Alzheimer's disease, progressive supranuclear palsy (PSP), corticobasal degeneration (CBD), frontotemporal lobar degeneration with tau pathology (FTLD-tau), and related tauopathies.
The MAPT locus exists in two common haplotype backgrounds — H1 and H2 — defined by an extended genomic inversion on chromosome 17q21. These haplotypes differ in their influence on MAPT expression levels and the balance of 3R:4R tau isoforms generated by alternative splicing of exon 10. The H1 haplotype, particularly the H1c sub-haplotype, has been associated with elevated tau expression and increased risk for PSP and CBD. The H2 haplotype is generally associated with lower tau expression and reduced tauopathy risk.
These are naturally occurring common haplotype variants — not mutations. Their influence on tau biology is haplotype-level and represents genetic variability that shapes experimental outcomes when donor MAPT status is unknown and uncontrolled.
Elevated tau expression
Associated with higher tau expression and increased PSP and CBD risk. Higher responsiveness under stress conditions reported.
Risk background
Associated with increased tau-related activity. Most common haplotype combination in European populations.
Lower tau activity
H2 allele is associated with lower tau expression and reduced tauopathy risk. Useful comparator background for H1-dominant studies.
Genotype selection controls a key source of genetic variability; observed phenotypic effects may vary depending on assay conditions and experimental design.
Confirmed MAPT Haplotype Status
| Cell Type | Catalog No. | H1/H1 (rs8070723) | H1/H2 (rs8070723) | H1c (rs242557) |
|---|---|---|---|---|
| Human Astrocytes Neonatal human brain-derived | Cat. #1800 | Available | Available | Available |
| Human Neurons Neonatal human brain-derived | Cat. #1520 | Available | Available | Available |
| Human Astrocytes-spinal cord Neonatal human brain-derived | Cat. #1820 | Available | Available | Available |
Reducing Donor Variability in Tau Biology Research
Donor-to-donor variation in tau expression and splicing is a recognized source of experimental variability in tauopathy research. When MAPT haplotype is unknown, differences between experimental groups may reflect inherited genetic background rather than treatment effect.
Reduce a major source of biological noise
MAPT haplotype is one of the most functionally relevant sources of donor variability in tau biology experiments — selecting for it removes an uncontrolled variable.
Compare haplotype-specific responses
Run H1/H1 and H1/H2 neurons or astrocytes side-by-side under defined conditions to isolate haplotype-dependent effects.
Resolve H1c sub-haplotype effects
Investigate the sub-haplotype associated with elevated tau expression and tauopathy risk within the broader H1 background.
Avoid conflating genotype with treatment effect
Particularly important for tau aggregation assays, tau splicing studies, and drug response experiments where donor variation can obscure true treatment signals.
Access primary human biology
Neurons and astrocytes retaining adult-state biology, tau isoform profiles, and electrophysiological properties relevant to in vivo disease.
Design dual-stratified studies
Combine MAPT haplotype selection with APOE genotype stratification for multi-variable genetic risk studies in the same primary cell system.
Applications Specific to MAPT Haplotype Biology
Available Cell Types
MAPT Haplotype-Defined Human Primary Neurons
H1/H1 and H1/H2 confirmed. H1c available on request. Recommended medium: Neuronal Medium (NM, Cat. #1521).
View product →MAPT Haplotype-Defined Human Primary Astrocytes
H1/H1 and H1/H2 confirmed. H1c available on request. Recommended medium: Astrocyte Medium (AM, Cat. #1801).
View product →APOE-Typed Neurons and Astrocytes
MAPT haplotype typing complements APOE genotype stratification for researchers studying combined genetic risk in CNS models.
View service →Requesting Haplotype-Defined Lots
Haplotype-defined lots are available by request. Request the MAPT Certificate of Analysis (COA) when placing your order to confirm donor haplotype status. A selection and verification fee applies per vial.
Identify the Cell Type
Identify the cell type — neurons (Cat. #1520) or astrocytes (Cat. #1800)
Specify MAPT Genotype
Specify the MAPT haplotype required — H1/H1, H1/H2, or H1c sub-haplotype if applicable
Submit Your Request
Our team will confirm available donors and provide a quote with MAPT COA.
Please note that availability varies by genotype and donor lot. A selection and verification fee will be applied per vial and reflected in your quote.
For information on available genotypes, assistance selecting the right cells, or inquiries about additional genotypes and cell types, please contact us at info@sciencellonline.com, or call 1.877.602.8549.