chr5-149027759-C-T

Position:

chr5-149027759-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2PM5BP4

The NM_024577.4(SH3TC2):c.1973G>A(p.Arg658His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000121 in 1,613,832 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R658C) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

SH3TC2
NM_024577.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:8

Conservation

PhyloP100: 3.39

Variant links:

Genes affected

SH3TC2 (HGNC:29427): (SH3 domain and tetratricopeptide repeats 2) This gene encodes a protein with two N-terminal Src homology 3 (SH3) domains and 10 tetratricopeptide repeat (TPR) motifs, and is a member of a small gene family. The gene product has been proposed to be an adapter or docking molecule. Mutations in this gene result in autosomal recessive Charcot-Marie-Tooth disease type 4C, a childhood-onset neurodegenerative disease characterized by demyelination of motor and sensory neurons. [provided by RefSeq, Jul 2008]

SH3TC2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr5-149027760-G-A is described in Lovd as [Pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.3807001).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SH3TC2	NM_024577.4 linkuse as main transcript	c.1973G>A	p.Arg658His	missense_variant	11/17	ENST00000515425.6	NP_078853.2	Q8TF17-1A0A514TP98

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SH3TC2	ENST00000515425.6 linkuse as main transcript	c.1973G>A	p.Arg658His	missense_variant	11/17	1	NM_024577.4	ENSP00000423660.1		Q8TF17-1

Frequencies

GnomAD3 genomes

AF:

0.000145

AC:

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000217

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000176

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000757

AC:

AN:

251060

Hom.:

AF XY:

0.0000958

AC XY:

AN XY:

135698

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000132

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000118

AC:

173

AN:

1461614

Hom.:

Cov.:

AF XY:

0.000127

AC XY:

AN XY:

727098

show subpopulations

Gnomad4 AFR exome

AF:

0.000239

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000696

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000138

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.000145

AC:

AN:

152218

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74356

show subpopulations

Gnomad4 AFR

AF:

0.000217

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000176

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000263

Hom.:

Bravo

AF:

0.000140

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.0000824

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000382

EpiControl

AF:

0.000356

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:4

Uncertain significance, criteria provided, single submitter	clinical testing	Athena Diagnostics	Dec 20, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jul 29, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Nov 15, 2021	Reported as a variant of uncertain significance in a patient with Charcot-Marie-Tooth disease in the published literature; however, additional information was not provided (Volodarsky et al., 2021); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 32376792) -
Uncertain significance, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Mar 05, 2024

Variant summary: SH3TC2 c.1973G>A (p.Arg658His) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 7.6e-05 in 251060 control chromosomes. c.1973G>A has been reported in the literature in at-least one individual affected with Charcot-Marie Disease (example, Volodarsky_2021). These report(s) do not provide unequivocal conclusions about association of the variant with Charcot-Marie Disease Type 4C. Additionally, one variant at the Arg658 residue has been reported as likely associated with disease in ClinVar (c.1972C>T p.Arg658Cys, ClinVar ID 21690), suggesting that this codon might be functionally important. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 32376792). ClinVar contains an entry for this variant (Variation ID: 216739). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Charcot-Marie-Tooth disease

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Molecular Genetics Laboratory, London Health Sciences Centre

- -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 22, 2021

The p.R658H variant (also known as c.1973G>A), located in coding exon 11 of the SH3TC2 gene, results from a G to A substitution at nucleotide position 1973. The arginine at codon 658 is replaced by histidine, an amino acid with highly similar properties. This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Charcot-Marie-Tooth disease type 4

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 11, 2023

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 658 of the SH3TC2 protein (p.Arg658His). This variant is present in population databases (rs138040787, gnomAD 0.02%). This missense change has been observed in individual(s) with Charcot-Marie-Tooth disease (PMID: 32376792). ClinVar contains an entry for this variant (Variation ID: 216739). 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 not expected to disrupt SH3TC2 protein function with a negative predictive value of 95%. This variant disrupts the p.Arg658 amino acid residue in SH3TC2. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 14574644, 16924012, 19744956, 21291453, 22462672). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.034

BayesDel_noAF

Uncertain

-0.050

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.50

D;.

Eigen

Uncertain

0.51

Eigen_PC

Uncertain

0.57

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.90

D;D

M_CAP

Benign

0.023

MetaRNN

Benign

0.38

T;T

MetaSVM

Benign

-0.68

MutationAssessor

Uncertain

2.0

M;.

PrimateAI

Benign

0.46

PROVEAN

Uncertain

-3.9

D;D

REVEL

Uncertain

0.36

Sift

Benign

0.098

T;T

Sift4G

Benign

0.21

T;T

Polyphen

0.98

D;.

Vest4

0.23

MVP

0.84

MPC

0.098

ClinPred

0.19

GERP RS

6.2

Varity_R

0.18

gMVP

0.54

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over