Is ABCC6 p.Asp777His (c.2329G>C) pathogenic?

ABCC6 p.Asp777His (c.2329G>C) is classified Uncertain significance in ABCC6 (ClinVar, Single submitter, 1 submitter). AlphaMissense: likely pathogenic (0.9437); Absent from gnomAD v4.1; Associated with arterial calcification, generalized, of infancy, 2.

What condition is associated with ABCC6 p.Asp777His (c.2329G>C)?

ABCC6 p.Asp777His (c.2329G>C) is associated with arterial calcification, generalized, of infancy, 2, autosomal recessive inherited pseudoxanthoma elasticum (ClinVar).

How common is ABCC6 p.Asp777His (c.2329G>C) in the general population?

ABCC6 p.Asp777His (c.2329G>C) is absent from gnomAD v4.1 (gnomAD).

How is Generalized arterial calcification of infancy inherited?

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

What do computational predictors say about ABCC6 p.Asp777His (c.2329G>C)?

AlphaMissense predicts likely pathogenic (score 0.9437) — an in-silico prediction, not a clinical call.

ABCC6 p.Asp777His

c.2329G>C · VCV3382640

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9437 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

arterial calcification, generalized, of infancy, 2

Computational evidence

Protein change
AlphaMissense	0.9437	likely pathogenic · top 1% in ABCC6
REVEL	0.991	strongly pathogenic-leaning
SaProt	LLR -13.52	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 1.8, phastCons 1
Regional constraint	o/e 0.98	unconstrained · MANE · 59 kb · p 0.39 · regional, not allelic
Overall
CADD	29.6	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: ABCC6
Protein: p.Asp777His
Coding: c.2329G>C
MANE Select: NM_001171
Type: single nucleotide variant
Location: chr16:16178884 (GRCh38)
Gene constraint: LOEUF 0.917 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.32 · 4 PDB
Residue 777: a UniProt-annotated variant site (in pxe; affects protein expression and trafficking; affects protein expression and trafficking; expression is reduced to less than 10%, when compared with the wt protein); a β-strand; the abc transporter 1 domain

Full ABCC6 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

arterial calcification, generalized, of infancy, 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: autosomal recessive inherited pseudoxanthoma elasticum

For Generalized arterial calcification of infancy (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: Antenatal, Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Worldwide)

Similar variants

ABCC6 p.Asp777Asn Conflicting classifications of pathogenicity ★ ⚠ same residue
ABCC6 c.1868-5T>G Pathogenic/Likely pathogenic ★★ same condition
ABCC6 c.2591-1G>T Likely pathogenic ★★ same condition
ABCC6 c.2787+1G>T Pathogenic ★★ same condition
ABCC6 c.3507-1G>A Pathogenic ★★ same condition
ABCC6 c.37-1G>A Pathogenic ★★ same condition
ABCC6 c.3736-1G>A Pathogenic ★★ same condition
ABCC6 c.3883-6G>A 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/abcc6-p-asp777his (accessed [today's date]).

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