NM_000023.4:c.1120C>T

Variant names:

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BA1

This summary comes from the ClinGen Evidence Repository: The NM_000023.4: c.1120C>T variant in SGCA is a missense variant predicted to cause substitution of arginine by cysteine at amino acid 374, p.(Arg374Cys). The filtering allele frequency of this variant for gnomAD v4.1.0 exomes is 0.01775 (the lower threshold of the 95% CI of 63/33478 African/African American chromosomes), which is higher than the ClinGen LGMD VCEP threshold (>0.002) for BA1, and therefore meets this criterion (BA1). This variant is not located in a splice region, and the SpliceAI score is 0, which suggests it does not impact splicing. The computational predictor REVEL gives a score of 0.39, which is above the LGMD VCEP threshold predicting a benign impact on SGCA function (≤0.1; BP4 not met). In summary, this variant meets the criteria to be classified as Benign for autosomal recessive limb girdle muscular dystrophy based on the ACMG/AMP criteria applied, as specified by the ClinGen LGMD VCEP (LGMD VCEP specifications version 1.0.0; 06/24/2025): BA1. LINK:https://erepo.genome.network/evrepo/ui/classification/CA180427/MONDO:0015152/189

Frequency

Genomes: 𝑓 0.0052 ( 5 hom., cov: 33)

Exomes 𝑓: 0.00066 ( 4 hom. )

Consequence

SGCA
NM_000023.4 missense

Scores

Clinical Significance

Benign reviewed by expert panel B:10

Conservation

PhyloP100: 1.25

Publications

1 publications found

Variant links:

Genes affected

SGCA (HGNC:10805): (sarcoglycan alpha) This gene encodes a component of the dystrophin-glycoprotein complex (DGC), which is critical to the stability of muscle fiber membranes and to the linking of the actin cytoskeleton to the extracellular matrix. Its expression is thought to be restricted to striated muscle. Mutations in this gene result in type 2D autosomal recessive limb-girdle muscular dystrophy. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2008]

SGCA Gene-Disease associations (from GenCC):

autosomal recessive limb-girdle muscular dystrophy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
autosomal recessive limb-girdle muscular dystrophy type 2D
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Myriad Women’s Health, Laboratory for Molecular Medicine, Orphanet

SGCA links:

ENSG00000253730 (HGNC:):

ENSG00000253730 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BA1

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
SGCA	NM_000023.4 link	c.1120C>T	p.Arg374Cys	missense_variant	Exon 9 of 10	ENST00000262018.8	NP_000014.1
SGCA	NM_001135697.3 link	c.748C>T	p.Arg250Cys	missense_variant	Exon 7 of 8		NP_001129169.1
SGCA	NR_135553.2 link	n.947C>T		non_coding_transcript_exon_variant	Exon 8 of 9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SGCA	ENST00000262018.8 link	c.1120C>T	p.Arg374Cys	missense_variant	Exon 9 of 10	1	NM_000023.4	ENSP00000262018.3

Frequencies

GnomAD3 genomes

AF:

0.00522

AC:

795

AN:

152274

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0175

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00347

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:

0.000103

Gnomad OTH

AF:

0.00478

GnomAD2 exomes

AF:

0.00171

AC:

424

AN:

248192

AF XY:

0.00131

show subpopulations

Gnomad AFR exome

AF:

0.0194

Gnomad AMR exome

AF:

0.00220

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000305

Gnomad OTH exome

AF:

0.000659

GnomAD4 exome

AF:

0.000658

AC:

961

AN:

1460732

Hom.:

Cov.:

AF XY:

0.000590

AC XY:

429

AN XY:

726698

show subpopulations

African (AFR)

AF:

0.0190

AC:

635

AN:

33478

American (AMR)

AF:

0.00224

AC:

100

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000696

AC:

AN:

86232

European-Finnish (FIN)

AF:

0.0000382

AC:

AN:

52368

Middle Eastern (MID)

AF:

0.00156

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.000101

AC:

112

AN:

1111982

Other (OTH)

AF:

0.00159

AC:

AN:

60368

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.473

Heterozygous variant carriers

127

190

254

317

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

104

130

<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:

0.00523

AC:

797

AN:

152392

Hom.:

Cov.:

AF XY:

0.00503

AC XY:

375

AN XY:

74516

show subpopulations

African (AFR)

AF:

0.0175

AC:

727

AN:

41594

American (AMR)

AF:

0.00346

AC:

AN:

15312

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10632

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

68044

Other (OTH)

AF:

0.00473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

135

180

225

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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

Alfa

AF:

0.00233

Hom.:

Bravo

AF:

0.00602

ESP6500AA

AF:

0.0163

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00201

AC:

244

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000356

ClinVar

Significance: Benign

Submissions summary: Benign:10

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Autosomal recessive limb-girdle muscular dystrophy type 2D

Benign:4

Mar 18, 2020

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 08, 2023

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 05, 2019

Natera, Inc.

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Benign:2

Dec 16, 2013

Eurofins Ntd Llc (ga)

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 20, 2024

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Autosomal recessive limb-girdle muscular dystrophy

Benign:1

Jun 24, 2025

ClinGen Limb Girdle Muscular Dystrophy Variant Curation Expert Panel, ClinGen

Significance:Benign

Review Status:reviewed by expert panel

Collection Method:curation

The NM_000023.4: c.1120C>T variant in SGCA is a missense variant predicted to cause substitution of arginine by cysteine at amino acid 374, p.(Arg374Cys). The filtering allele frequency of this variant for gnomAD v4.1.0 exomes is 0.01775 (the lower threshold of the 95% CI of 63/33478 African/African American chromosomes), which is higher than the ClinGen LGMD VCEP threshold (>0.002) for BA1, and therefore meets this criterion (BA1). This variant is not located in a splice region, and the SpliceAI score is 0, which suggests it does not impact splicing. The computational predictor REVEL gives a score of 0.39, which is above the LGMD VCEP threshold predicting a benign impact on SGCA function (≤0.1; BP4 not met). In summary, this variant meets the criteria to be classified as Benign for autosomal recessive limb girdle muscular dystrophy based on the ACMG/AMP criteria applied, as specified by the ClinGen LGMD VCEP (LGMD VCEP specifications version 1.0.0; 06/24/2025): BA1. -

Cardiomyopathy

Benign:1

Nov 28, 2018

Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:1

Feb 11, 2020

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Sarcoglycanopathy

Benign:1

Jan 12, 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

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.20

BayesDel_noAF

Uncertain

-0.040

CADD

Benign

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.36

.;T

Eigen

Benign

-0.89

Eigen_PC

Benign

-0.88

FATHMM_MKL

Benign

0.063

LIST_S2

Benign

0.74

T;T

MetaRNN

Benign

0.0041

T;T

MetaSVM

Uncertain

0.12

MutationAssessor

Benign

1.7

.;L

PhyloP100

1.3

PrimateAI

Benign

0.26

PROVEAN

Benign

-1.5

N;N

REVEL

Uncertain

0.39

Sift

Uncertain

0.028

D;T

Sift4G

Benign

0.12

T;T

Polyphen

0.0010

B;B

Vest4

0.21

MVP

0.90

MPC

0.48

ClinPred

0.0062

GERP RS

1.3

Varity_R

0.078

gMVP

0.21

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over