13-23295431-T-C
Variant names:
Variant summary
Our verdict is Likely benign. Variant got -5 ACMG points: 2P and 7B. PM2BP4_StrongBP6_ModerateBP7
The NM_000231.3(SGCG):āc.522T>Cā(p.Leu174Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000112 in 1,613,902 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (ā ).
Frequency
Genomes: š 0.000013 ( 0 hom., cov: 33)
Exomes š: 0.000011 ( 0 hom. )
Consequence
SGCG
NM_000231.3 synonymous
NM_000231.3 synonymous
Scores
2
Clinical Significance
Conservation
PhyloP100: -0.251
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]
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ACMG classification
Classification made for transcript
Verdict is Likely_benign. Variant got -5 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
BP4
Computational evidence support a benign effect (BayesDel_noAF=-0.62).
BP6
Variant 13-23295431-T-C is Benign according to our data. Variant chr13-23295431-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 1145060.Status of the report is criteria_provided_single_submitter, 1 stars.
BP7
Synonymous conserved (PhyloP=-0.251 with no splicing effect.
Transcripts
RefSeq
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
SGCG | ENST00000218867.4 | c.522T>C | p.Leu174Leu | synonymous_variant | Exon 6 of 8 | 1 | NM_000231.3 | ENSP00000218867.3 | ||
SACS | ENST00000683210.1 | c.2186-6188A>G | intron_variant | Intron 9 of 9 | ENSP00000506739.1 |
Frequencies
GnomAD3 genomes AF: 0.0000131 AC: 2AN: 152160Hom.: 0 Cov.: 33
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GnomAD3 exomes AF: 0.0000318 AC: 8AN: 251430Hom.: 0 AF XY: 0.0000221 AC XY: 3AN XY: 135880
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GnomAD4 exome AF: 0.0000109 AC: 16AN: 1461742Hom.: 0 Cov.: 30 AF XY: 0.0000110 AC XY: 8AN XY: 727174
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GnomAD4 genome AF: 0.0000131 AC: 2AN: 152160Hom.: 0 Cov.: 33 AF XY: 0.0000135 AC XY: 1AN XY: 74336
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ClinVar
Significance: Likely benign
Submissions summary: Benign:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Autosomal recessive limb-girdle muscular dystrophy type 2C Benign:1
Feb 12, 2024
Labcorp Genetics (formerly Invitae), Labcorp
Significance: Likely benign
Review Status: criteria provided, single submitter
Collection Method: clinical testing
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Computational scores
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BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Splicing
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Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at