rs9552911

chr13-23290518-G-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000231.3(SGCG):c.506-4897G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0163 in 152,252 control chromosomes in the GnomAD database, including 222 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.016 (222 hom., cov: 32)
• Consequence: SGCG NM_000231.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0670

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]

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.239 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SGCG	NM_000231.3	c.506-4897G>A		intron_variant		ENST00000218867.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SGCG	ENST00000218867.4	c.506-4897G>A		intron_variant		1	NM_000231.3	P1
SACS	ENST00000683210.1	c.2186-1275C>T		intron_variant

Frequencies

GnomAD3 genomes AF: 0.0164 AC: 2490 AN: 152134 Hom.: 224 Cov.: 32

Gnomad AFR AF: 0.00205

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0251

Gnomad ASJ AF: 0.00144

Gnomad EAS AF: 0.251

Gnomad SAS AF: 0.125

Gnomad FIN AF: 0.000943

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00123

Gnomad OTH AF: 0.0100

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0163 AC: 2483 AN: 152252 Hom.: 222 Cov.: 32 AF XY: 0.0206 AC XY: 1531 AN XY: 74438

Gnomad4 AFR AF: 0.00205

Gnomad4 AMR AF: 0.0251

Gnomad4 ASJ AF: 0.00144

Gnomad4 EAS AF: 0.251

Gnomad4 SAS AF: 0.124

Gnomad4 FIN AF: 0.000943

Gnomad4 NFE AF: 0.00123

Gnomad4 OTH AF: 0.0104

Alfa AF: 0.0117 Hom.: 35

Bravo AF: 0.0149

Asia WGS AF: 0.150 AC: 523 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
Cadd	Benign	3.5
Dann	Benign	0.40

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

Other links and lift over

dbSNP: rs9552911; hg19: chr13-23864657;