Is RAB3GAP2 p.Ser1133= (c.3399C>T) pathogenic?

RAB3GAP2 p.Ser1133= (c.3399C>T) is classified Likely benign in RAB3GAP2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-09-26). Ultra-rare (popmax 0.0165%, mid); Associated with Martsolf syndrome.

What condition is associated with RAB3GAP2 p.Ser1133= (c.3399C>T)?

RAB3GAP2 p.Ser1133= (c.3399C>T) is associated with Martsolf syndrome, Warburg micro syndrome 2 (ClinVar).

How common is RAB3GAP2 p.Ser1133= (c.3399C>T) in the general population?

RAB3GAP2 p.Ser1133= (c.3399C>T) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

RAB3GAP2 p.Ser1133=

c.3399C>T · rs372398660 · VCV2198846

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

Martsolf syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -8	GERP -3
Overall
CADD	2.035	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,050 alleles

Filtering AF 0.000615% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000474%

Overall 0.00124% 20/1,613,742 alleles · ultra-rare exomes 19/1,461,828 · genomes 1/151,914 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,050
Remaining individualsnot grpmax-eligible	0.0032%	31,238
African / African-American	0.00267%	37,414
Admixed American	0.00167%	59,930
European (non-Finnish)	0.0011%	90,770
South Asian	0.0011%	91,062

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.Ser1133=
Coding: c.3399C>T
MANE Select: NM_012414
dbSNP: rs372398660
Type: single nucleotide variant
Location: chr1:220157426 (GRCh38)
Gene constraint: LOEUF 0.535 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.77 · 1 PDB

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

Disease context

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

Also linked: Warburg micro syndrome 2

Similar variants

RAB3GAP2 c.713-2A>C Likely pathogenic ★★ same condition
RAB3GAP2 p.Arg1213Ter Pathogenic ★★ same condition
RAB3GAP2 p.Arg426Cys Pathogenic/Likely 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
RAB3GAP2 p.Ala684Glu 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-ser1133 (accessed [today's date]).

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