Is IGLL1 p.Ala174= (c.522G>A) pathogenic?

IGLL1 p.Ala174= (c.522G>A) is classified Likely benign in IGLL1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-07-30). Ultra-rare (popmax 0.0164%, mid); Associated with agammaglobulinemia 2, autosomal recessive.

What condition is associated with IGLL1 p.Ala174= (c.522G>A)?

IGLL1 p.Ala174= (c.522G>A) is associated with agammaglobulinemia 2, autosomal recessive (ClinVar).

How common is IGLL1 p.Ala174= (c.522G>A) in the general population?

IGLL1 p.Ala174= (c.522G>A) is ultra-rare (popmax 0.0164%, mid) (gnomAD).

IGLL1 p.Ala174=

c.522G>A · rs374026526 · VCV742186

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0164%, mid)

Conditions

agammaglobulinemia 2, autosomal recessive

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 -5	GERP -2
Overall
CADD	3.694	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0164% Middle Eastern · 1/6,082 alleles

Filtering AF 0.000875% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000605%

Overall 0.0013% 21/1,613,956 alleles · ultra-rare exomes 20/1,461,840 · genomes 1/152,116 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0164%	6,082
South Asian	0.00329%	30,362
Remaining individualsnot grpmax-eligible	0.0032%	31,239
European (non-Finnish)	0.00127%	78,666

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: IGLL1
Protein: p.Ala174=
Coding: c.522G>A
MANE Select: NM_020070
dbSNP: rs374026526
Type: single nucleotide variant
Location: chr22:23573386 (GRCh38)
Gene constraint: LOEUF 1.844 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 75.19 · 3 PDB
Residue 174: the ig-like c1-type domain; a β-strand; the 'c region' region

Full IGLL1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

agammaglobulinemia 2, autosomal recessive — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

IGLL1 p.Ala174Ser Uncertain significance ★★ ⚠ same residue
IGLL1 p.Ala174Thr Benign/Likely benign ★★ same residue
IGLL1 p.Ala174Val Benign/Likely benign ★★ same residue
IGLL1 p.Ala174Met Benign/Likely benign ★★ same residue
IGLL1 p.Ala174fs Uncertain significance ★ same residue
IGLL1 p.Ala12Val Uncertain significance ★★ ⚠ same condition
IGLL1 p.Arg23His Uncertain significance ★★ ⚠ same condition
IGLL1 p.Arg2Lys Uncertain significance ★★ ⚠ 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/igll1-p-ala174 (accessed [today's date]).

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