rs475992

Variant names:

• chr13-23300011-A-G
• rs475992
• NM_000231.3:c.578+4524A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000231.3(SGCG):​c.578+4524A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.558 in 152,054 control chromosomes in the GnomAD database, including 24,669 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. The gene SGCG is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: 𝑓 0.56 (24669 hom., cov: 32)
• Consequence: SGCG NM_000231.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.01
• Publications: 6 publications found

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]

SACS Gene-Disease associations (from GenCC):

• Charlevoix-Saguenay spastic ataxia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Myriad Women's Health, Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia, Laboratory for Molecular Medicine, Orphanet

ACMG classification

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

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.824 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000231.3. 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
	SGCG	NM_000231.3	MANE Select	c.578+4524A>G		intron	N/A	NP_000222.2	Q13326
	SGCG	NM_001378244.1		c.632+4524A>G		intron	N/A	NP_001365173.1
	SGCG	NM_001378245.1		c.578+4524A>G		intron	N/A	NP_001365174.1	Q13326

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SGCG	ENST00000218867.4	TSL:1 MANE Select	c.578+4524A>G		intron	N/A	ENSP00000218867.3	Q13326
	SACS	ENST00000683210.1		c.2186-10768T>C		intron	N/A	ENSP00000506739.1	A0A804HHS6
	SGCG	ENST00000942469.1		c.579-3446A>G		intron	N/A	ENSP00000612528.1

Frequencies

GnomAD3 genomes AF: 0.558 AC: 84752 AN: 151936 Hom.: 24663 Cov.: 32

Gnomad AFR AF: 0.394

Gnomad AMI AF: 0.633

Gnomad AMR AF: 0.667

Gnomad ASJ AF: 0.495

Gnomad EAS AF: 0.844

Gnomad SAS AF: 0.568

Gnomad FIN AF: 0.614

Gnomad MID AF: 0.669

Gnomad NFE AF: 0.603

Gnomad OTH AF: 0.587

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

GnomAD4 genome AF: 0.558 AC: 84786 AN: 152054 Hom.: 24669 Cov.: 32 AF XY: 0.561 AC XY: 41707 AN XY: 74310

African (AFR) AF: 0.393 AC: 16307 AN: 41468

American (AMR) AF: 0.667 AC: 10203 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.495 AC: 1715 AN: 3468

East Asian (EAS) AF: 0.845 AC: 4354 AN: 5154

South Asian (SAS) AF: 0.567 AC: 2733 AN: 4820

European-Finnish (FIN) AF: 0.614 AC: 6489 AN: 10560

Middle Eastern (MID) AF: 0.664 AC: 194 AN: 292

European-Non Finnish (NFE) AF: 0.603 AC: 40966 AN: 67982

Other (OTH) AF: 0.591 AC: 1248 AN: 2112

Alfa AF: 0.589 Hom.: 113085

Bravo AF: 0.559

Asia WGS AF: 0.708 AC: 2464 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	7.5
DANN	Benign	0.79
PhyloP100		2.0
Mutation Taster		=100/0	polymorphism (auto)

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs475992;

hg19: chr13-23874150;