Is SLC19A1 p.Ser225Leu (c.674C>T) pathogenic?

SLC19A1 p.Ser225Leu (c.674C>T) is classified Uncertain significance in SLC19A1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-12-10). AlphaMissense: likely benign (0.1169); Ultra-rare (popmax 0.0154%, sas).

How common is SLC19A1 p.Ser225Leu (c.674C>T) in the general population?

SLC19A1 p.Ser225Leu (c.674C>T) is ultra-rare (popmax 0.0154%, sas) (gnomAD).

What do computational predictors say about SLC19A1 p.Ser225Leu (c.674C>T)?

AlphaMissense predicts likely benign (score 0.1169) — an in-silico prediction, not a clinical call.

SLC19A1 p.Ser225Leu

c.674C>T · VCV3442956

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1169 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0154%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1169	likely benign
REVEL	0.243	benign-leaning
SaProt	LLR -6.03	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.8	GERP -1.4, phastCons 0.86
Regional constraint	o/e 1.00	unconstrained · MANE · 22 kb · p 0.89 · regional, not allelic
Overall
CADD	20.5	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0154% South Asian · 14/91,058 alleles

Filtering AF 0.0092% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00735%

Overall 0.00118% 19/1,612,360 alleles · ultra-rare exomes 19/1,460,026 · genomes 0/152,334 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0154%	6,504
Remaining individualsnot grpmax-eligible	0.0032%	31,238
East Asian	0.00223%	44,876
European (non-Finnish)	0.00017%	589,897

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: SLC19A1
Protein: p.Ser225Leu
Coding: c.674C>T
MANE Select: NM_194255
Type: single nucleotide variant
Location: chr21:45531664 (GRCh38)
Gene constraint: LOEUF 1.585 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 73.30 · 19 PDB
Residue 225: a modified residue (phosphoserine)

Full SLC19A1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

SLC19A1 p.Ser225Trp Uncertain significance ★★ ⚠ same residue
COL18A1 p.Arg1081Ter Pathogenic/Likely pathogenic ★★ same type
COL18A1 p.Arg915Ter Pathogenic/Likely pathogenic ★★ same type
RFC1 p.Arg383Ter Pathogenic/Likely pathogenic ★★ same type
COL18A1 c.*30G>A Uncertain significance ★★ same type
COL18A1 p.Ala1089Thr Uncertain significance ★★ ⚠ same type
COL18A1 p.Ala1254Val Uncertain significance ★★ ⚠ same type
COL18A1 p.Arg1081Gln Uncertain significance ★★ ⚠ same type

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/slc19a1-p-ser225leu (accessed [today's date]).

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