Is EXT2 p.Ala150Asp (c.449C>A) pathogenic?

EXT2 p.Ala150Asp (c.449C>A) is classified Uncertain significance in EXT2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-11). AlphaMissense: likely pathogenic (0.9969); Very rare (popmax 0.00144%, nfe); Associated with Inborn genetic diseases.

What condition is associated with EXT2 p.Ala150Asp (c.449C>A)?

EXT2 p.Ala150Asp (c.449C>A) is associated with Inborn genetic diseases (ClinVar).

How common is EXT2 p.Ala150Asp (c.449C>A) in the general population?

EXT2 p.Ala150Asp (c.449C>A) is very rare (popmax 0.00144%, nfe) (gnomAD).

What do computational predictors say about EXT2 p.Ala150Asp (c.449C>A)?

AlphaMissense predicts likely pathogenic (score 0.9969) — an in-silico prediction, not a clinical call.

EXT2 p.Ala150Asp

c.449C>A · VCV4252115

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9969 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00144%, nfe)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.9969	likely pathogenic · top 7% in EXT2
REVEL	0.976	strongly pathogenic-leaning
SaProt	LLR -15.61	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.6	GERP 2.2, phastCons 1
Regional constraint	o/e 0.93	unconstrained · MANE · 99 kb · p 0.085 · regional, not allelic
Overall
CADD	29.2	PHRED · no single calibrated threshold — expert panels disagree

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

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00144% European (non-Finnish) · 17/1,180,032 alleles

Filtering AF 0.000878% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000717%

Overall 0.00112% 18/1,613,980 alleles · very rare exomes 17/1,461,790 · genomes 1/152,190 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00144%	69,414
South Asian	0.0011%	91,082

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: EXT2
Protein: p.Ala150Asp
Coding: c.449C>A
MANE Select: NM_207122
Type: single nucleotide variant
Location: chr11:44108161 (GRCh38)
Gene constraint: LOEUF 0.775 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 87.59 · 6 PDB

Full EXT2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

EXT2 p.Gly277Ter Pathogenic ★★ same condition
EXT2 p.Ala171Glu Uncertain significance ★★ ⚠ same condition
EXT2 p.Ala458Thr Uncertain significance ★★ ⚠ same condition
EXT2 p.Ala630Pro Uncertain significance ★★ ⚠ same condition
EXT2 p.Arg10Gln Uncertain significance ★★ ⚠ same condition
EXT2 p.Arg17Thr Uncertain significance ★★ ⚠ same condition
EXT2 p.Arg23Gln Uncertain significance ★★ ⚠ same condition
EXT2 p.Arg465Gln Uncertain significance ★★ ⚠ 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/ext2-p-ala150asp (accessed [today's date]).

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