Genetic Variant SGCA:p.Arg184Leu (chr17-50168539-G-T) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2PP3_Strong

The NM_000023.4(SGCA):c.551G>T(p.Arg184Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000703 in 1,422,140 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R184S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

SGCA
NM_000023.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 8.73

Publications

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

SGCA links:

ENSG00000253730 (HGNC:):

ENSG00000253730 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.981

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000023.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SGCA	NM_000023.4	MANE Select	c.551G>T	p.Arg184Leu	missense	Exon 5 of 10	NP_000014.1	A0A0S2Z4Q1
SGCA	NM_001135697.3		c.551G>T	p.Arg184Leu	missense	Exon 5 of 8	NP_001129169.1	A0A0S2Z4P8
SGCA	NR_135553.2		n.587G>T		non_coding_transcript_exon	Exon 5 of 9

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SGCA	ENST00000262018.8	TSL:1 MANE Select	c.551G>T	p.Arg184Leu	missense	Exon 5 of 10	ENSP00000262018.3	Q16586-1
SGCA	ENST00000344627.10	TSL:1	c.551G>T	p.Arg184Leu	missense	Exon 5 of 8	ENSP00000345522.6	Q16586-2
SGCA	ENST00000952408.1		c.641G>T	p.Arg214Leu	missense	Exon 5 of 10	ENSP00000622467.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00

AC:

AN:

184938

AF XY:

0.00

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

7.03e-7

AC:

AN:

1422140

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

703494

show subpopulations

African (AFR)

AF:

0.0000305

AC:

AN:

32766

American (AMR)

AF:

0.00

AC:

AN:

38560

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25404

East Asian (EAS)

AF:

0.00

AC:

AN:

37886

South Asian (SAS)

AF:

0.00

AC:

AN:

80984

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50680

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5726

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1091204

Other (OTH)

AF:

0.00

AC:

AN:

58930

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.81

BayesDel_addAF

Pathogenic

0.54

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.98

Eigen

Pathogenic

0.75

Eigen_PC

Pathogenic

0.70

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.96

M_CAP

Pathogenic

0.63

MetaRNN

Pathogenic

0.98

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.4

PhyloP100

8.7

PrimateAI

Uncertain

0.73

PROVEAN

Pathogenic

-5.3

REVEL

Pathogenic

0.98

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.95

MutPred

0.90

Loss of methylation at R184 (P = 0.0173)

MVP

1.0

MPC

1.1

ClinPred

1.0

GERP RS

4.6

Varity_R

0.81

gMVP

0.95

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over