NM_000023.4:c.26dupC

Variant names:

• chr17-50166064-T-TC
• rs1904771410
• NM_000023.4:c.26dupC

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000023.4(SGCA):​c.26dupC​(p.Leu10SerfsTer34) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). The gene SGCA is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SGCA NM_000023.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.0340
• Publications: 0 publications found

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

ENSG00000253730 (HGNC:):

ACMG classification

Specifications for SGCA are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 167 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-50166064-T-TC is Pathogenic according to our data. Variant chr17-50166064-T-TC is described in ClinVar as Pathogenic. ClinVar VariationId is 843937.Status of the report is criteria_provided_single_submitter, 1 stars.

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SGCA	NM_000023.4	MANE Select	c.26dupC	p.Leu10SerfsTer34	frameshift	Exon 1 of 10	NP_000014.1	A0A0S2Z4Q1
	SGCA	NM_001135697.3		c.26dupC	p.Leu10SerfsTer34	frameshift	Exon 1 of 8	NP_001129169.1	A0A0S2Z4P8
	SGCA	NR_135553.2		n.62dupC		non_coding_transcript_exon	Exon 1 of 9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SGCA	ENST00000262018.8	TSL:1 MANE Select	c.26dupC	p.Leu10SerfsTer34	frameshift	Exon 1 of 10	ENSP00000262018.3	Q16586-1
	SGCA	ENST00000344627.10	TSL:1	c.26dupC	p.Leu10SerfsTer34	frameshift	Exon 1 of 8	ENSP00000345522.6	Q16586-2
	SGCA	ENST00000952408.1		c.26dupC	p.Leu10SerfsTer64	frameshift	Exon 1 of 10	ENSP00000622467.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Autosomal recessive limb-girdle muscular dystrophy type 2D (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.034
Mutation Taster		=5/195	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1904771410; hg19: chr17-48243425;