Is APP p.Ala673Val (c.2018C>T) pathogenic?

APP p.Ala673Val (c.2018C>T) is classified Pathogenic in APP (ClinVar, No assertion criteria, 1 submitter; last evaluated 2009-03-13). AlphaMissense: likely benign (0.1348); Absent from gnomAD v4.1; Associated with Alzheimer disease.

What condition is associated with APP p.Ala673Val (c.2018C>T)?

APP p.Ala673Val (c.2018C>T) is associated with Alzheimer disease (ClinVar).

How common is APP p.Ala673Val (c.2018C>T) in the general population?

APP p.Ala673Val (c.2018C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about APP p.Ala673Val (c.2018C>T)?

AlphaMissense predicts likely benign (score 0.1348) — an in-silico prediction, not a clinical call.

APP p.Ala673Val

c.2018C>T · rs193922916 · VCV18106

Pathogenic No assertion criteria

Classification

Pathogenic

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1348 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

Alzheimer disease

Computational evidence

Protein change
AlphaMissense	0.1348	likely benign ⚠ discordant with ClinVar
REVEL	0.601	indeterminate
SaProt	LLR -6.42	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.9, phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 289 kb · p 2e-07 · regional, not allelic
Overall
CADD	25.3	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: APP
Protein: p.Ala673Val
Coding: c.2018C>T
MANE Select: NM_000484
dbSNP: rs193922916
Type: single nucleotide variant
Location: chr21:25897619 (GRCh38)
Gene constraint: LOEUF 0.41 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 68.11 · 263 PDB
Residue 673: an α-helix; a functional site (cleavage; by caspase-6; when associated with variant 670-n-l-671)

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

Disease context

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

Similar variants

APP p.Ala673Thr Benign/Likely benign ★★ same residue
APP p.Ala673= Likely benign ★ same residue
APP p.Ala713Thr Likely pathogenic ★★ ⚠ same condition
APP p.Asp694Asn Pathogenic ★★ ⚠ same condition
APP p.Glu693Gln Pathogenic ★★ ⚠ same condition
APP p.Ile716Phe Pathogenic ★★ ⚠ same condition
APP p.Thr714Ala Pathogenic ★★ ⚠ same condition
APP p.Val715Met 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/app-p-ala673val (accessed [today's date]).

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