Is SLC19A2 p.Val442Ala (c.1325T>C) pathogenic?

SLC19A2 p.Val442Ala (c.1325T>C) is classified Uncertain significance in SLC19A2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-05-27). AlphaMissense: ambiguous (0.3781); Absent from gnomAD v4.1; Associated with thiamine-responsive megaloblastic anemia syndrome.

What condition is associated with SLC19A2 p.Val442Ala (c.1325T>C)?

SLC19A2 p.Val442Ala (c.1325T>C) is associated with thiamine-responsive megaloblastic anemia syndrome (ClinVar).

How common is SLC19A2 p.Val442Ala (c.1325T>C) in the general population?

SLC19A2 p.Val442Ala (c.1325T>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about SLC19A2 p.Val442Ala (c.1325T>C)?

AlphaMissense predicts ambiguous (score 0.3781) — an in-silico prediction, not a clinical call.

SLC19A2 p.Val442Ala

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

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

c.1325T>C · VCV3599890

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3781 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense indeterminate

Conditions

thiamine-responsive megaloblastic anemia syndrome

Computational evidence

Protein change
AlphaMissense	0.3781	ambiguous
REVEL	0.825	moderately pathogenic-leaning
SaProt	LLR -9.91	tolerated
⇒ REVEL calls this damaging; SaProt does not; AlphaMissense is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 8.1	GERP 2, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 20 kb · p 0.054 · regional, not allelic
Overall
CADD	25.6	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: SLC19A2
Protein: p.Val442Ala
Coding: c.1325T>C
MANE Select: NM_006996
Type: single nucleotide variant
Location: chr1:169468151 (GRCh38)
Gene constraint: LOEUF 0.852 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 80.99 · 2 PDB
Residue 442: 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 p.Val442Gly Uncertain significance ★★ ⚠ same residue
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

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-val442ala (accessed [today's date]).

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