Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1PM2PM5PP3_StrongPP5

The NM_000023.4(SGCA):c.644C>T(p.Ser215Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S215P) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 31)

Consequence

SGCA
NM_000023.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2

Conservation

PhyloP100: 1.33

Publications

2 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:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 11 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 12 uncertain in NM_000023.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr17-50169150-T-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 1494468.Status of the report is criteria_provided_single_submitter, 1 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.946

PP5

Variant 17-50169151-C-T is Pathogenic according to our data. Variant chr17-50169151-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 551091.

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
SGCA	NM_000023.4	MANE Select	c.644C>T	p.Ser215Phe	missense	Exon 6 of 10	NP_000014.1
SGCA	NR_135553.2		n.680C>T		non_coding_transcript_exon	Exon 6 of 9
SGCA	NM_001135697.3		c.584+579C>T		intron	N/A	NP_001129169.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SGCA	ENST00000262018.8	TSL:1 MANE Select	c.644C>T	p.Ser215Phe	missense	Exon 6 of 10	ENSP00000262018.3
SGCA	ENST00000344627.10	TSL:1	c.584+579C>T		intron	N/A	ENSP00000345522.6
SGCA	ENST00000682109.1		c.524C>T	p.Ser175Phe	missense	Exon 5 of 8	ENSP00000508041.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Autosomal recessive limb-girdle muscular dystrophy type 2D (4)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Pathogenic

0.30

BayesDel_noAF

Pathogenic

0.19

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.82

Eigen

Benign

0.15

Eigen_PC

Benign

0.054

FATHMM_MKL

Benign

0.38

LIST_S2

Benign

0.82

M_CAP

Uncertain

0.17

MetaRNN

Pathogenic

0.95

MetaSVM

Pathogenic

1.0

MutationAssessor

Uncertain

2.4

PhyloP100

1.3

PrimateAI

Uncertain

0.51

PROVEAN

Benign

-1.9

REVEL

Pathogenic

0.70

Sift

Uncertain

0.0060

Sift4G

Uncertain

0.0060

Polyphen

0.99

Vest4

0.75

MutPred

0.83

Loss of disorder (P = 0.0063)

MVP

1.0

MPC

0.44

ClinPred

0.86

GERP RS

4.2

Varity_R

0.14

gMVP

0.67

Mutation Taster

=27/73

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over