Is ALPL p.Thr366Asn (c.1097C>A) pathogenic?

ALPL p.Thr366Asn (c.1097C>A) is classified Uncertain significance in ALPL (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-29). AlphaMissense: likely pathogenic (0.6594); Absent from gnomAD v4.1; Associated with hypophosphatasia.

What condition is associated with ALPL p.Thr366Asn (c.1097C>A)?

ALPL p.Thr366Asn (c.1097C>A) is associated with hypophosphatasia (ClinVar).

How common is ALPL p.Thr366Asn (c.1097C>A) in the general population?

ALPL p.Thr366Asn (c.1097C>A) is absent from gnomAD v4.1 (gnomAD).

How is Hypophosphatasia inherited?

Typically Autosomal dominant, Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about ALPL p.Thr366Asn (c.1097C>A)?

AlphaMissense predicts likely pathogenic (score 0.6594) — an in-silico prediction, not a clinical call.

ALPL p.Thr366Asn

c.1097C>A · VCV4086867

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.6594 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hypophosphatasia

Computational evidence

Protein change
AlphaMissense	0.6594	likely pathogenic
REVEL	0.765	pathogenic-leaning
SaProt	LLR -15.37	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 7.7	GERP 1.6, phastCons 1
Regional constraint	o/e 0.83	unconstrained · MANE · 24 kb · p 6.1e-06 · regional, not allelic
Overall
CADD	24.4	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

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: ALPL
Protein: p.Thr366Asn
Coding: c.1097C>A
MANE Select: NM_000478
Type: single nucleotide variant
Location: chr1:21575832 (GRCh38)
Gene constraint: LOEUF 0.987 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.74 · 5 PDB

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

Disease context

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

For Hypophosphatasia (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: All ages

Similar variants

ALPL p.Thr366Ile Uncertain significance ★★ ⚠ same residue
ALPL p.Thr366= Likely benign ★★ same residue
ALPL c.1190-2A>T Pathogenic ★★ same condition
ALPL c.182-1G>A Pathogenic/Likely pathogenic ★★ same condition
ALPL c.182-2A>G Pathogenic/Likely pathogenic ★★ same condition
ALPL c.297+1G>A Pathogenic/Likely pathogenic ★★ same condition
ALPL c.298-1G>A Pathogenic ★★ same condition
ALPL c.472+1G>A 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/alpl-p-thr366asn (accessed [today's date]).

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