Is RAB3GAP2 p.Arg426= (c.1278C>T) pathogenic?

RAB3GAP2 p.Arg426= (c.1278C>T) is classified Likely benign in RAB3GAP2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-12-16). Very rare (popmax 0.00265%, nfe); Associated with Warburg micro syndrome 2.

What condition is associated with RAB3GAP2 p.Arg426= (c.1278C>T)?

RAB3GAP2 p.Arg426= (c.1278C>T) is associated with Warburg micro syndrome 2, Martsolf syndrome (ClinVar).

How common is RAB3GAP2 p.Arg426= (c.1278C>T) in the general population?

RAB3GAP2 p.Arg426= (c.1278C>T) is very rare (popmax 0.00265%, nfe) (gnomAD).

RAB3GAP2 p.Arg426=

c.1278C>T · rs776143902 · VCV2042106

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00265%, nfe)

Conditions

Warburg micro syndrome 2

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.5	GERP -3.4
Overall
CADD	4.14	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00265% European (non-Finnish) · 31/1,171,354 alleles

Filtering AF 0.0019% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00165%

Overall 0.00213% 34/1,596,744 alleles · very rare exomes 31/1,448,652 · genomes 3/148,092 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00265%	37,786
Admixed American	0.0017%	58,680
African / African-American	0.00137%	72,924
South Asian	0.0011%	90,722

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: RAB3GAP2
Protein: p.Arg426=
Coding: c.1278C>T
MANE Select: NM_012414
dbSNP: rs776143902
Type: single nucleotide variant
Location: chr1:220191277 (GRCh38)
Gene constraint: LOEUF 0.535 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.77 · 1 PDB
Residue 426: a UniProt-annotated variant site (in marts1; abolishes gef activity towards rab18)

Full RAB3GAP2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Warburg micro syndrome 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Martsolf syndrome

Similar variants

RAB3GAP2 p.Arg426Cys Pathogenic/Likely pathogenic ★★ same residue
RAB3GAP2 p.Arg426His Uncertain significance ★ ⚠ same residue
RAB3GAP2 c.713-2A>C Likely pathogenic ★★ same condition
RAB3GAP2 p.Arg1213Ter Pathogenic ★★ same condition
RAB3GAP2 c.*2171A>G Uncertain significance ★★ same condition
RAB3GAP2 p.Ala16Thr Uncertain significance ★★ ⚠ same condition
RAB3GAP2 p.Ala240Pro Uncertain significance ★★ ⚠ same condition
RAB3GAP2 p.Ala300Thr 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/rab3gap2-p-arg426 (accessed [today's date]).

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