2-135150437-G-A

Variant names:

• chr2-135150437-G-A
• rs7595725
• NM_012233.3:c.1992G>A

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_012233.3(RAB3GAP1):​c.1992G>A​(p.Ser664Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00546 in 1,614,136 control chromosomes in the GnomAD database, including 352 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.027 (166 hom., cov: 32)
  • Exomes 𝑓: 0.0032 (186 hom.)
• Consequence: RAB3GAP1 NM_012233.3 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:7
• Conservation: PhyloP100: -2.68

Genes affected

RAB3GAP1 (HGNC:17063): (RAB3 GTPase activating protein catalytic subunit 1) This gene encodes the catalytic subunit of a Rab GTPase activating protein. The encoded protein forms a heterodimer with a non-catalytic subunit to specifically regulate the activity of members of the Rab3 subfamily of small G proteins. This protein mediates the hydrolysis of GTP bound Rab3 to the GDP bound form. Mutations in this gene are associated with Warburg micro syndrome. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Feb 2010]

ZRANB3 (HGNC:25249): (zinc finger RANBP2-type containing 3) Enables ATP-dependent DNA/DNA annealing activity; K63-linked polyubiquitin modification-dependent protein binding activity; and endodeoxyribonuclease activity. Involved in several processes, including DNA metabolic process; DNA rewinding; and negative regulation of DNA recombination. Located in nuclear replication fork and nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).
• BP6: Variant 2-135150437-G-A is Benign according to our data. Variant chr2-135150437-G-A is described in ClinVar as [Benign]. Clinvar id is 130065.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-135150437-G-A is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-2.68 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0901 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RAB3GAP1	NM_012233.3	c.1992G>A	p.Ser664Ser	synonymous_variant	Exon 18 of 24	ENST00000264158.13	NP_036365.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RAB3GAP1	ENST00000264158.13	c.1992G>A	p.Ser664Ser	synonymous_variant	Exon 18 of 24	1	NM_012233.3	ENSP00000264158.8

Frequencies

GnomAD3 genomes AF: 0.0270 AC: 4103 AN: 152134 Hom.: 162 Cov.: 32

Gnomad AFR AF: 0.0923

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0115

Gnomad ASJ AF: 0.00490

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000828

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000617

Gnomad OTH AF: 0.0206

GnomAD3 exomes AF: 0.00745 AC: 1873 AN: 251454 Hom.: 81 AF XY: 0.00549 AC XY: 746 AN XY: 135898

Gnomad AFR exome AF: 0.0951

Gnomad AMR exome AF: 0.00538

Gnomad ASJ exome AF: 0.00357

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000261

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000554

Gnomad OTH exome AF: 0.00554

GnomAD4 exome AF: 0.00321 AC: 4687 AN: 1461884 Hom.: 186 Cov.: 31 AF XY: 0.00281 AC XY: 2044 AN XY: 727244

Gnomad4 AFR exome AF: 0.0998

Gnomad4 AMR exome AF: 0.00657

Gnomad4 ASJ exome AF: 0.00398

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000382

Gnomad4 OTH exome AF: 0.00745

GnomAD4 genome AF: 0.0271 AC: 4126 AN: 152252 Hom.: 166 Cov.: 32 AF XY: 0.0271 AC XY: 2020 AN XY: 74460

Gnomad4 AFR AF: 0.0926

Gnomad4 AMR AF: 0.0115

Gnomad4 ASJ AF: 0.00490

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000829

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000617

Gnomad4 OTH AF: 0.0204

Alfa AF: 0.00721 Hom.: 62

Bravo AF: 0.0310

Asia WGS AF: 0.00635 AC: 22 AN: 3478

EpiCase AF: 0.000709

EpiControl AF: 0.000652

ClinVar

Significance: Benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

-

Genetic Services Laboratory, University of Chicago

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -

Sep 30, 2024

Athena Diagnostics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 06, 2016

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

not provided Benign:2

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

RAB3GAP1-related disorder Benign:1

May 08, 2019

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Warburg micro syndrome 1 Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
CADD	Benign	4.2
DANN	Benign	0.81
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs7595725; hg19: chr2-135908007;