Is PIGN p.Pro606Ala (c.1816C>G) pathogenic?

PIGN p.Pro606Ala (c.1816C>G) is classified Uncertain significance in PIGN (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-03-17). AlphaMissense: likely pathogenic (0.5678); Very rare (popmax 0.00496%, nfe); Associated with multiple congenital anomalies-hypotonia-seizures syndrome 1.

What condition is associated with PIGN p.Pro606Ala (c.1816C>G)?

PIGN p.Pro606Ala (c.1816C>G) is associated with multiple congenital anomalies-hypotonia-seizures syndrome 1 (ClinVar).

How common is PIGN p.Pro606Ala (c.1816C>G) in the general population?

PIGN p.Pro606Ala (c.1816C>G) is very rare (popmax 0.00496%, nfe) (gnomAD).

What do computational predictors say about PIGN p.Pro606Ala (c.1816C>G)?

AlphaMissense predicts likely pathogenic (score 0.5678) — an in-silico prediction, not a clinical call.

PIGN p.Pro606Ala

c.1816C>G · rs776011686 · VCV539553

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.5678 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00496%, nfe)

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

multiple congenital anomalies-hypotonia-seizures syndrome 1

Computational evidence

Protein change
AlphaMissense	0.5678	likely pathogenic
REVEL	0.5	indeterminate
SaProt	LLR -12.31	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2.1, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 109 kb · p 0.83 · regional, not allelic
Overall
CADD	26.9	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 0.00496% European (non-Finnish) · 57/1,149,064 alleles

Filtering AF 0.00388% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00354%

Overall 0.00373% 58/1,555,662 alleles · very rare exomes 47/1,403,546 · genomes 11/152,116 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00496%	20,159
African / African-American	0.00137%	73,138

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: PIGN
Protein: p.Pro606Ala
Coding: c.1816C>G
MANE Select: NM_176787
dbSNP: rs776011686
Type: single nucleotide variant
Location: chr18:62105586 (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 p.Pro606= Likely benign ★ same residue
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

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-pro606ala (accessed [today's date]).

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