Is SLC19A2 p.Gln311= (c.933A>G) pathogenic?

SLC19A2 p.Gln311= (c.933A>G) is classified Uncertain significance in SLC19A2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-04-22). Very rare (popmax 0.00334%, amr); Associated with thiamine-responsive megaloblastic anemia syndrome.

What condition is associated with SLC19A2 p.Gln311= (c.933A>G)?

SLC19A2 p.Gln311= (c.933A>G) is associated with thiamine-responsive megaloblastic anemia syndrome (ClinVar).

How common is SLC19A2 p.Gln311= (c.933A>G) in the general population?

SLC19A2 p.Gln311= (c.933A>G) is very rare (popmax 0.00334%, amr) (gnomAD).

SLC19A2 p.Gln311=

Q: How is Thiamine-responsive megaloblastic anemia syndrome inherited?

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

c.933A>G · VCV3600006

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00334%, amr)

Conditions

thiamine-responsive megaloblastic anemia syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.78	acceptor gain · deltas
Pangolin	Δ0.64	gain · loss 0.00 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 0.065	GERP -3.1, phastCons 0.97
Overall
CADD	21.0	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00334% Admixed American · 2/59,968 alleles

Filtering AF 0.000553% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000207%

Overall 0.00031% 5/1,613,784 alleles · very rare exomes 4/1,461,780 · genomes 1/152,004 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00334%	29,984
Remaining individualsnot grpmax-eligible	0.0016%	62,478
African / African-American	0.00134%	74,842
European (non-Finnish)	8.47e-05%	1,179,948

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: SLC19A2
Protein: p.Gln311=
Coding: c.933A>G
MANE Select: NM_006996
Type: single nucleotide variant
Location: chr1:169470061 (GRCh38)
Gene constraint: LOEUF 0.852 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 80.99 · 2 PDB
Residue 311: an α-helix

Full SLC19A2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

thiamine-responsive megaloblastic anemia syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Thiamine-responsive megaloblastic anemia syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

SLC19A2 c.1223+1G>A Pathogenic ★★ same condition
SLC19A2 c.807+2T>G Likely pathogenic ★★ same condition
SLC19A2 p.Arg162Ter Pathogenic ★★ same condition
SLC19A2 p.Arg397Ter Pathogenic/Likely pathogenic ★★ same condition
SLC19A2 p.Gln233Ter Pathogenic ★★ same condition
SLC19A2 p.Gly105Glu Pathogenic/Likely pathogenic ★★ same condition
SLC19A2 p.Gly172Asp Pathogenic/Likely pathogenic ★★ same condition
SLC19A2 p.Gly334Asp 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/slc19a2-p-gln311 (accessed [today's date]).

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