Is PIGN p.Asp318Val (c.953A>T) pathogenic?

PIGN p.Asp318Val (c.953A>T) is classified Uncertain significance in PIGN (ClinVar, Single submitter, 1 submitter; last evaluated 2018-10-24). AlphaMissense: likely pathogenic (0.86); No allele count reported in gnomAD v4.1 (AN 1,518,832); Associated with multiple congenital anomalies-hypotonia-seizures syndrome 1.

What condition is associated with PIGN p.Asp318Val (c.953A>T)?

PIGN p.Asp318Val (c.953A>T) is associated with multiple congenital anomalies-hypotonia-seizures syndrome 1 (ClinVar).

How common is PIGN p.Asp318Val (c.953A>T) in the general population?

PIGN p.Asp318Val (c.953A>T) is no allele count reported in gnomAD v4.1 (AN 1,518,832) (gnomAD).

What do computational predictors say about PIGN p.Asp318Val (c.953A>T)?

AlphaMissense predicts likely pathogenic (score 0.86) — an in-silico prediction, not a clinical call.

PIGN p.Asp318Val

c.953A>T · rs1599620627 · VCV641991

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.86 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,518,832)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

multiple congenital anomalies-hypotonia-seizures syndrome 1

Computational evidence

Protein change
AlphaMissense	0.86	likely pathogenic
REVEL	0.693	pathogenic-leaning
SaProt	LLR -16.19	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 7.9	GERP 2.1, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 109 kb · p 0.83 · regional, not allelic
Overall
CADD	29.4	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

No allele count reported in gnomAD v4.1 (AN 1,518,832). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: PIGN
Protein: p.Asp318Val
Coding: c.953A>T
MANE Select: NM_176787
dbSNP: rs1599620627
Type: single nucleotide variant
Location: chr18:62143316 (GRCh38)
Gene constraint: LOEUF 1.46 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 88.33

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

Disease context

multiple congenital anomalies-hypotonia-seizures syndrome 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PIGN c.1251+1G>A Pathogenic/Likely pathogenic ★★ same condition
PIGN c.1252-2A>G Pathogenic/Likely pathogenic ★★ same condition
PIGN c.1434+5G>A Pathogenic/Likely pathogenic ★★ same condition
PIGN c.1574+1G>A Likely pathogenic ★★ same condition
PIGN c.1674+1G>A Likely pathogenic ★★ same condition
PIGN c.1674+1G>C Pathogenic ★★ same condition
PIGN c.1675-1G>T Pathogenic/Likely pathogenic ★★ same condition
PIGN c.222-1G>A 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/pign-p-asp318val (accessed [today's date]).

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