rs147820869

Positions:

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM1BP4_StrongBP6BS2

The NM_000231.3(SGCG):c.832G>A(p.Gly278Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000323 in 1,613,298 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00045 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00031 ( 2 hom. )

Consequence

SGCG
NM_000231.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:5

Conservation

PhyloP100: 7.26

Variant links:

Genes affected

SGCG (HGNC:10809): (sarcoglycan gamma) This gene encodes gamma-sarcoglycan, one of several sarcolemmal transmembrane glycoproteins that interact with dystrophin. The dystrophin-glycoprotein complex (DGC) spans the sarcolemma and is comprised of dystrophin, syntrophin, alpha- and beta-dystroglycans and sarcoglycans. The DGC provides a structural link between the subsarcolemmal cytoskeleton and the extracellular matrix of muscle cells. Defects in the encoded protein can lead to early onset autosomal recessive muscular dystrophy, in particular limb-girdle muscular dystrophy, type 2C (LGMD2C). [provided by RefSeq, Oct 2008]

SGCG links:

SACS (HGNC:10519): (sacsin molecular chaperone) This gene encodes the sacsin protein, which includes a UbL domain at the N-terminus, a DnaJ domain, and a HEPN domain at the C-terminus. The gene is highly expressed in the central nervous system, also found in skin, skeletal muscles and at low levels in the pancreas. This gene includes a very large exon spanning more than 12.8 kb. Mutations in this gene result in autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS), a neurodegenerative disorder characterized by early-onset cerebellar ataxia with spasticity and peripheral neuropathy. The authors of a publication on the effects of siRNA-mediated sacsin knockdown concluded that sacsin protects against mutant ataxin-1 and suggest that "the large multi-domain sacsin protein is able to recruit Hsp70 chaperone action and has the potential to regulate the effects of other ataxia proteins" (Parfitt et al., PubMed: 19208651). A pseudogene associated with this gene is located on chromosome 11. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, May 2013]

SACS links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

PM1

In a chain Gamma-sarcoglycan (size 290) in uniprot entity SGCG_HUMAN there are 28 pathogenic changes around while only 1 benign (97%) in NM_000231.3

BP4

Computational evidence support a benign effect (MetaRNN=0.009368837).

BP6

Variant 13-23324497-G-A is Benign according to our data. Variant chr13-23324497-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 285833.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=2, Benign=1}.

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SGCG	NM_000231.3 linkuse as main transcript	c.832G>A	p.Gly278Ser	missense_variant	8/8	ENST00000218867.4	NP_000222.2	Q13326

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SGCG	ENST00000218867.4 linkuse as main transcript	c.832G>A	p.Gly278Ser	missense_variant	8/8	1	NM_000231.3	ENSP00000218867.3		Q13326

Frequencies

GnomAD3 genomes

AF:

0.000454

AC:

AN:

152048

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00110

Gnomad AMR

AF:

0.000524

Gnomad ASJ

AF:

0.0112

Gnomad EAS

AF:

0.00155

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000132

Gnomad OTH

AF:

0.000959

GnomAD3 exomes

AF:

0.000776

AC:

195

AN:

251336

Hom.:

AF XY:

0.000662

AC XY:

AN XY:

135852

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.000607

Gnomad ASJ exome

AF:

0.0104

Gnomad EAS exome

AF:

0.00223

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000158

Gnomad OTH exome

AF:

0.00114

GnomAD4 exome

AF:

0.000309

AC:

452

AN:

1461132

Hom.:

Cov.:

AF XY:

0.000316

AC XY:

230

AN XY:

726872

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000581

Gnomad4 ASJ exome

AF:

0.00983

Gnomad4 EAS exome

AF:

0.000856

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000719

Gnomad4 OTH exome

AF:

0.000812

GnomAD4 genome

AF:

0.000453

AC:

AN:

152166

Hom.:

Cov.:

AF XY:

0.000484

AC XY:

AN XY:

74378

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.000523

Gnomad4 ASJ

AF:

0.0112

Gnomad4 EAS

AF:

0.00155

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.000949

Alfa

AF:

0.000664

Hom.:

Bravo

AF:

0.000529

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000626

AC:

EpiCase

AF:

0.000327

EpiControl

AF:

0.000415

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Aug 17, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Feb 02, 2016	- -
Likely benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	May 21, 2018	- -

Autosomal recessive limb-girdle muscular dystrophy type 2C

Benign:2

Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Apr 19, 2020	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 30, 2024	- -

Limb-girdle muscular dystrophy, recessive

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Sarcoglycanopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.075

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Uncertain

0.020

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.77

Eigen

Uncertain

0.54

Eigen_PC

Uncertain

0.47

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.87

M_CAP

Uncertain

0.14

MetaRNN

Benign

0.0094

MetaSVM

Pathogenic

0.87

MutationAssessor

Uncertain

2.7

PrimateAI

Benign

0.37

PROVEAN

Benign

-1.4

REVEL

Uncertain

0.61

Sift

Benign

0.068

Sift4G

Uncertain

0.046

Polyphen

0.97

Vest4

0.15

MVP

0.94

MPC

0.14

ClinPred

0.097

GERP RS

5.3

Varity_R

0.14

gMVP

0.56

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