Is SI p.Lys1473Arg (c.4418A>G) pathogenic?

SI p.Lys1473Arg (c.4418A>G) is classified Benign/Likely benign in SI (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-01-24). AlphaMissense: likely benign (0.0716); Rare (popmax 0.281%, sas); Associated with Inborn genetic diseases.

What condition is associated with SI p.Lys1473Arg (c.4418A>G)?

SI p.Lys1473Arg (c.4418A>G) is associated with Inborn genetic diseases (ClinVar).

How common is SI p.Lys1473Arg (c.4418A>G) in the general population?

SI p.Lys1473Arg (c.4418A>G) is rare (popmax 0.281%, sas) (gnomAD).

What do computational predictors say about SI p.Lys1473Arg (c.4418A>G)?

AlphaMissense predicts likely benign (score 0.0716) — an in-silico prediction, not a clinical call.

SI p.Lys1473Arg

c.4418A>G · rs528294901 · VCV1599372

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0716 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.281%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0716	likely benign
REVEL	0.256	benign-leaning
SaProt	LLR -6.70	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 -2.3	GERP -3.5
Regional constraint	o/e 1.10	unconstrained · MANE · 97 kb · p 9.1e-07 · regional, not allelic
Overall
CADD	1.859	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

Grpmax group 0.281% South Asian · 256/91,054 alleles

Filtering AF 0.253% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.242%

Overall 0.0166% 267/1,611,048 alleles · rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.281%	356
Middle Eastern	0.0166%	6,040
Remaining individualsnot grpmax-eligible	0.0144%	6,929
African / African-American	0.00134%	74,898

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: SI
Protein: p.Lys1473Arg
Coding: c.4418A>G
MANE Select: NM_001041
dbSNP: rs528294901
Type: single nucleotide variant
Location: chr3:164998662 (GRCh38)
Gene constraint: LOEUF 1.009 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 93.86 · 2 PDB
Residue 1473: the 'sucrase' region

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

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

SI p.Ala1654Asp Uncertain significance ★★ ⚠ same condition
SI p.Ala429Thr Uncertain significance ★★ ⚠ same condition
SI p.Ala573Val Uncertain significance ★★ ⚠ same condition
SI p.Ala760Val Uncertain significance ★★ ⚠ same condition
SI p.Ala808Thr Uncertain significance ★★ ⚠ same condition
SI p.Ala826Asp Uncertain significance ★★ ⚠ same condition
SI p.Arg1078Gln Uncertain significance ★★ same condition
SI p.Arg1078Trp 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/si-p-lys1473arg (accessed [today's date]).

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