Is PIGN p.Gln671= (c.2013G>A) pathogenic?

PIGN p.Gln671= (c.2013G>A) is classified Likely benign in PIGN (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-01-24). Ultra-rare (popmax 0.0627%, afr); Associated with multiple congenital anomalies-hypotonia-seizures syndrome 1.

What condition is associated with PIGN p.Gln671= (c.2013G>A)?

PIGN p.Gln671= (c.2013G>A) is associated with multiple congenital anomalies-hypotonia-seizures syndrome 1 (ClinVar).

How common is PIGN p.Gln671= (c.2013G>A) in the general population?

PIGN p.Gln671= (c.2013G>A) is ultra-rare (popmax 0.0627%, afr) (gnomAD).

PIGN p.Gln671=

c.2013G>A · rs536963290 · VCV771075

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0627%, afr)

Conditions

multiple congenital anomalies-hypotonia-seizures syndrome 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.1	GERP -4.2
Overall
CADD	0.891	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0627% African / African-American · 47/74,996 alleles

Filtering AF 0.0483% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0433%

Overall 0.0036% 58/1,611,570 alleles · ultra-rare exomes 31/1,459,346 · genomes 27/152,224 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0627%	1,596
Middle Eastern	0.033%	3,027
Remaining individualsnot grpmax-eligible	0.0112%	8,914
Admixed American	0.00167%	59,994
European (non-Finnish)	8.49e-05%	1,178,287

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.Gln671=
Coding: c.2013G>A
MANE Select: NM_176787
dbSNP: rs536963290
Type: single nucleotide variant
Location: chr18:62101139 (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-gln671 (accessed [today's date]).

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