Is SLC19A3 p.Val426del (c.1274TAG[1]) pathogenic?

SLC19A3 p.Val426del (c.1274TAG[1]) is classified Pathogenic in SLC19A3 (ClinVar, No assertion criteria, 1 submitter; last evaluated 2017-09-14). No gnomAD frequency available for this variant; Associated with biotin-responsive basal ganglia disease.

What condition is associated with SLC19A3 p.Val426del (c.1274TAG[1])?

SLC19A3 p.Val426del (c.1274TAG[1]) is associated with biotin-responsive basal ganglia disease (ClinVar).

How common is SLC19A3 p.Val426del (c.1274TAG[1]) in the general population?

SLC19A3 p.Val426del (c.1274TAG[1]) is no gnomAD frequency available for this variant (gnomAD).

How is Thiamine-responsive encephalopathy inherited?

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

SLC19A3 p.Val426del

c.1274TAG[1] · rs1553568249 · VCV438725

Pathogenic No assertion criteria

Classification

Pathogenic

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

biotin-responsive basal ganglia disease

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 7.9	GERP 1.8, phastCons 1

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: SLC19A3
Protein: p.Val426del
Coding: c.1274TAG[1]
MANE Select: NM_025243
dbSNP: rs1553568249
Type: Microsatellite
Location: chr2:227688201 (GRCh38)
Gene constraint: LOEUF 0.968 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.96 · 19 PDB
Residue 426: an α-helix

Full SLC19A3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

biotin-responsive basal ganglia disease — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Thiamine-responsive encephalopathy (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent

Similar variants

SLC19A3 p.Val259fs Pathogenic ★ same condition
SLC19A3 p.His483fs Uncertain significance ★ same condition
SLC19A3 p.Met28del Uncertain significance ★ same condition
SLC19A3 c.1172+1G>A Pathogenic/Likely pathogenic ★★ same condition
SLC19A3 c.1172+2T>G Pathogenic ★★ same condition
SLC19A3 c.1173-1G>A Pathogenic/Likely pathogenic ★★ same condition
SLC19A3 c.151-1G>C Likely pathogenic ★★ same condition
SLC19A3 c.980-14A>G 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/slc19a3-p-val426del (accessed [today's date]).

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