Is IGFALS p.Ala36= (c.108C>T) pathogenic?

IGFALS p.Ala36= (c.108C>T) is classified Uncertain significance in IGFALS (ClinVar, Single submitter, 1 submitter; last evaluated 2018-01-13). Very rare (popmax 0.00533%, afr); Associated with short stature due to primary acid-labile subunit deficiency.

What condition is associated with IGFALS p.Ala36= (c.108C>T)?

IGFALS p.Ala36= (c.108C>T) is associated with short stature due to primary acid-labile subunit deficiency (ClinVar).

How common is IGFALS p.Ala36= (c.108C>T) in the general population?

IGFALS p.Ala36= (c.108C>T) is very rare (popmax 0.00533%, afr) (gnomAD).

IGFALS p.Ala36=

Q: How is Short stature due to primary acid-labile subunit deficiency inherited?

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

c.108C>T · rs886051780 · VCV318266

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00533%, afr)

Conditions

short stature due to primary acid-labile subunit deficiency

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 -11	GERP -3.3
Overall
CADD	0.414	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00533% African / African-American · 4/74,992 alleles

Filtering AF 0.00175% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00104%

Overall 0.000939% 15/1,597,238 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00533%	18,748
South Asian	0.0022%	45,460
Remaining individualsnot grpmax-eligible	0.00161%	62,148
European (non-Finnish)	0.000679%	147,320

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: IGFALS
Protein: p.Ala36=
Coding: c.108C>T
MANE Select: NM_004970
dbSNP: rs886051780
Type: single nucleotide variant
Location: chr16:1792310 (GRCh38)
Gene constraint: LOEUF 1.908 · pLI 0.07 (gnomAD)
Structure: AlphaFold pLDDT 91.13 · 1 PDB
Residue 36: the lrrnt domain

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

Disease context

short stature due to primary acid-labile subunit deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Short stature due to primary acid-labile subunit deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal
Prevalence: <1 / 1 000 000 (Europe)

Similar variants

IGFALS p.Ala36Asp Uncertain significance ★ ⚠ same residue
IGFALS p.Asn276Ser Likely pathogenic ★★ same condition
IGFALS p.Ala147Thr Uncertain significance ★★ ⚠ same condition
IGFALS p.Ala258Val Uncertain significance ★★ ⚠ same condition
IGFALS p.Ala551Thr Uncertain significance ★★ ⚠ same condition
IGFALS p.Arg306Gln Uncertain significance ★★ ⚠ same condition
IGFALS p.Arg493His Uncertain significance ★★ ⚠ same condition
IGFALS p.Asp52Asn 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/igfals-p-ala36 (accessed [today's date]).

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