Is MAPT p.Ala336Val (c.1007C>T) pathogenic?

MAPT p.Ala336Val (c.1007C>T) is classified Uncertain significance in MAPT (ClinVar, Single submitter, 1 submitter). AlphaMissense: likely benign (0.0851); Ultra-rare (popmax 0.0318%, sas); Associated with frontotemporal dementia.

What condition is associated with MAPT p.Ala336Val (c.1007C>T)?

MAPT p.Ala336Val (c.1007C>T) is associated with frontotemporal dementia (ClinVar).

How common is MAPT p.Ala336Val (c.1007C>T) in the general population?

MAPT p.Ala336Val (c.1007C>T) is ultra-rare (popmax 0.0318%, sas) (gnomAD).

What do computational predictors say about MAPT p.Ala336Val (c.1007C>T)?

AlphaMissense predicts likely benign (score 0.0851) — an in-silico prediction, not a clinical call.

MAPT p.Ala336Val

c.1007C>T · rs570884008 · VCV2585150

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0851 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0318%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

frontotemporal dementia

Computational evidence

Protein change
AlphaMissense	0.0851	likely benign
REVEL	0.022	moderately benign-leaning
SaProt	LLR -7.02	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -1.4	GERP 1.9
Regional constraint	o/e 0.90	unconstrained · MANE · 29 kb · p 0.0043 · regional, not allelic
Overall
CADD	6.141	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM A261V vs ClinVar A336V) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0318% South Asian · 29/91,078 alleles

Filtering AF 0.0228% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0196%

Overall 0.00192% 31/1,613,230 alleles · ultra-rare exomes 30/1,460,972 · genomes 1/152,258 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0318%	3,141
Remaining individualsnot grpmax-eligible	0.0016%	62,498
European (non-Finnish)	8.47e-05%	1,179,988

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: MAPT
Protein: p.Ala336Val
Coding: c.1007C>T
MANE Select: NM_001377265
dbSNP: rs570884008
Type: single nucleotide variant
Location: chr17:45983586 (GRCh38)
Gene constraint: LOEUF 0.723 · pLI <0.01 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 49.56 · 299 PDB
Residue 261 UniProt numbering: the 'disordered' region

Full MAPT gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

frontotemporal dementia — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

MAPT p.Ala336= Likely benign ★★ same residue
MAPT c.1999-10G>T Pathogenic ★★ same condition
MAPT c.2091+16C>T Pathogenic ★★ same condition
MAPT c.2091+3G>A Pathogenic ★★ same condition
MAPT p.Arg798Trp Pathogenic ★★ ⚠ same condition
MAPT p.Asn671Lys Pathogenic ★★ ⚠ same condition
MAPT p.Asn688= Pathogenic ★★ same condition
MAPT p.Gln728His Pathogenic/Likely pathogenic ★★ ⚠ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/mapt-p-ala336val (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown