rs387907341

Variant names:

• chr3-179416495-T-C
• rs387907341
• NM_021629.4:c.265A>G

Your query was ambiguous. Multiple possible variants found:

• chr3-179416495-T-C
• chr3-179416495-T-G

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Moderate PP5_Moderate

The NM_021629.4(GNB4):​c.265A>G​(p.Lys89Glu) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K89T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GNB4 NM_021629.4 missense, splice_region
• Scores: Splicing: ADA: 0.6880
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.91
• Publications: 8 publications found

Genes affected

GNB4 (HGNC:20731): (G protein subunit beta 4) Heterotrimeric guanine nucleotide-binding proteins (G proteins), which integrate signals between receptors and effector proteins, are composed of an alpha, a beta, and a gamma subunit. These subunits are encoded by families of related genes. This gene encodes a beta subunit. Beta subunits are important regulators of alpha subunits, as well as of certain signal transduction receptors and effectors. [provided by RefSeq, Jul 2008]

GNB4 Gene-Disease associations (from GenCC):

• Charcot-Marie-Tooth disease dominant intermediate F

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• Charcot-Marie-Tooth disease

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM1: In a repeat WD 1 (size 39) in uniprot entity GBB4_HUMAN there are 5 pathogenic changes around while only 2 benign (71%) in NM_021629.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.872
• PP5: Variant 3-179416495-T-C is Pathogenic according to our data. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-179416495-T-C is described in CliVar as Pathogenic. Clinvar id is 41941.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GNB4	NM_021629.4	c.265A>G	p.Lys89Glu	missense_variant, splice_region_variant	Exon 5 of 10	ENST00000232564.8	NP_067642.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GNB4	ENST00000232564.8	c.265A>G	p.Lys89Glu	missense_variant, splice_region_variant	Exon 5 of 10	1	NM_021629.4	ENSP00000232564.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 22

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease dominant intermediate F Pathogenic:2

May 20, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces lysine, which is basic and polar, with glutamic acid, which is acidic and polar, at codon 89 of the GNB4 protein (p.Lys89Glu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with Charcot-Marie-Tooth disease (PMID: 23434117, 31211173, 34071515). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 41941). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. Experimental studies have shown that this missense change affects GNB4 function (PMID: 23434117). For these reasons, this variant has been classified as Pathogenic. -

Mar 07, 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	1.0
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Benign	0.22	T;T
Eigen	Pathogenic	0.73
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.92	.;D
M_CAP	Pathogenic	0.29	D
MetaRNN	Pathogenic	0.87	D;D
MetaSVM	Benign	-0.99	T
MutationAssessor	Uncertain	2.2	M;M
PhyloP100		7.9
PrimateAI	Pathogenic	0.90	D
PROVEAN	Uncertain	-3.7	D;D
REVEL	Uncertain	0.50
Sift	Pathogenic	0.0	D;D
Sift4G	Uncertain	0.0020	D;D
Polyphen		1.0	D;D
Vest4		0.94
MutPred		0.59		Loss of ubiquitination at K89 (P = 0.0446);Loss of ubiquitination at K89 (P = 0.0446);
MVP		0.80
MPC		0.88
ClinPred		0.99	D
GERP RS		5.5
Varity_R		0.86
gMVP		0.64
Mutation Taster		=11/89	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.69
dbscSNV1_RF	Benign	0.48
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs387907341; hg19: chr3-179134283; COSMIC: COSV106341921; COSMIC: COSV106341921;