rs587777167

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PM2PP3_ModeratePP5_Very_Strong

The NM_012414.4(RAB3GAP2):c.1276C>T(p.Arg426Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000967 in 1,551,246 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R426H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000069 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

RAB3GAP2
NM_012414.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4O:1

Conservation

PhyloP100: 4.05

Publications

4 publications found

Variant links:

Genes affected

RAB3GAP2 (HGNC:17168): (RAB3 GTPase activating non-catalytic protein subunit 2) The protein encoded by this gene belongs to the RAB3 protein family, members of which are involved in regulated exocytosis of neurotransmitters and hormones. This protein forms the Rab3 GTPase-activating complex with RAB3GAP1, where it constitutes the regulatory subunit, whereas the latter functions as the catalytic subunit. This gene has the highest level of expression in the brain, consistent with it having a key role in neurodevelopment. Mutations in this gene are associated with Martsolf syndrome.[provided by RefSeq, Oct 2009]

RAB3GAP2 Gene-Disease associations (from GenCC):

Martsolf syndrome 1
Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
RAB18 deficiency
Inheritance: AR Classification: DEFINITIVE Submitted by: Ambry Genetics
Warburg micro syndrome
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
Warburg micro syndrome 2
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
autosomal recessive spastic paraplegia type 69
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
cataract-intellectual disability-hypogonadism syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

RAB3GAP2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 12 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.932

PP5

Variant 1-220191279-G-A is Pathogenic according to our data. Variant chr1-220191279-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 100787.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RAB3GAP2	NM_012414.4 link	c.1276C>T	p.Arg426Cys	missense_variant	Exon 14 of 35	ENST00000358951.7	NP_036546.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RAB3GAP2	ENST00000358951.7 link	c.1276C>T	p.Arg426Cys	missense_variant	Exon 14 of 35	1	NM_012414.4	ENSP00000351832.2

Frequencies

GnomAD3 genomes

AF:

0.00000690

AC:

AN:

144844

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000256

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000162

AC:

AN:

246834

AF XY:

0.0000150

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000878

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000900

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000995

AC:

AN:

1406402

Hom.:

Cov.:

AF XY:

0.00000858

AC XY:

AN XY:

699386

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31818

American (AMR)

AF:

0.0000700

AC:

AN:

42860

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24022

East Asian (EAS)

AF:

0.00

AC:

AN:

35592

South Asian (SAS)

AF:

0.0000350

AC:

AN:

85604

European-Finnish (FIN)

AF:

0.0000206

AC:

AN:

48454

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5514

European-Non Finnish (NFE)

AF:

0.00000651

AC:

AN:

1075916

Other (OTH)

AF:

0.00

AC:

AN:

56622

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.461

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000690

AC:

AN:

144844

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

69776

show subpopulations

African (AFR)

AF:

0.0000256

AC:

AN:

39082

American (AMR)

AF:

0.00

AC:

AN:

13706

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3426

East Asian (EAS)

AF:

0.00

AC:

AN:

4760

South Asian (SAS)

AF:

0.00

AC:

AN:

4554

European-Finnish (FIN)

AF:

0.00

AC:

AN:

9078

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67052

Other (OTH)

AF:

0.00

AC:

AN:

1984

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000126

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Martsolf syndrome;C3280214:Warburg micro syndrome 2

Pathogenic:2

Jan 26, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 426 of the RAB3GAP2 protein (p.Arg426Cys). This variant is present in population databases (rs587777167, gnomAD 0.009%). This missense change has been observed in individual(s) with clinical features of Martsolf syndrome (PMID: 23420520; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 100787). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt RAB3GAP2 protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects RAB3GAP2 function (PMID: 24891604). For these reasons, this variant has been classified as Pathogenic. -

Oct 12, 2018

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Martsolf syndrome

Pathogenic:1Other:1

Dec 03, 2017

Genomic Research Center, Shahid Beheshti University of Medical Sciences

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

GeneReviews

Significance:not provided

Review Status:no classification provided

Collection Method:literature only

- -

Martsolf syndrome 1

Pathogenic:1

May 01, 2013

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.35

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.59

Eigen

Uncertain

0.46

Eigen_PC

Uncertain

0.40

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Pathogenic

0.99

M_CAP

Pathogenic

0.40

MetaRNN

Pathogenic

0.93

MetaSVM

Uncertain

0.33

MutationAssessor

Pathogenic

3.0

PhyloP100

4.1

PrimateAI

Uncertain

0.65

PROVEAN

Pathogenic

-7.2

REVEL

Pathogenic

0.79

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0010

Polyphen

1.0

Vest4

0.98

MutPred

0.69

Loss of MoRF binding (P = 0.0083);

MVP

0.78

MPC

0.73

ClinPred

0.95

GERP RS

4.8

Varity_R

0.76

gMVP

0.87

Mutation Taster

=7/93

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over