rs1800354

Variant names:

• chr13-23324525-A-C
• rs1800354
• NM_000231.3:c.860A>C
• SGCG p.Asn287Thr

Your query was ambiguous. Multiple possible variants found:

• chr13-23324525-A-C
• chr13-23324525-A-G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Moderate BP6_Moderate

The NM_000231.3(SGCG):​c.860A>C​(p.Asn287Thr) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N287S) has been classified as Benign. The gene SGCG is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: not found (cov: 29)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SGCG NM_000231.3 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 4.11
• Publications: 33 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

LOC107984585 (HGNC:):

ACMG classification

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

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11308169).
• BP6: Variant 13-23324525-A-C is Benign according to our data. Variant chr13-23324525-A-C is described in ClinVar as Likely_benign. ClinVar VariationId is 2890939.Status of the report is criteria_provided_single_submitter, 1 stars.

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.860A>C	p.Asn287Thr	missense	Exon 8 of 8	NP_000222.2	Q13326
	SGCG	NM_001378244.1		c.914A>C	p.Asn305Thr	missense	Exon 8 of 8	NP_001365173.1
	SGCG	NM_001378245.1		c.860A>C	p.Asn287Thr	missense	Exon 9 of 9	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.860A>C	p.Asn287Thr	missense	Exon 8 of 8	ENSP00000218867.3	Q13326
	SGCG	ENST00000942469.1		c.1040A>C	p.Asn347Thr	missense	Exon 9 of 9	ENSP00000612528.1
	SGCG	ENST00000876364.1		c.860A>C	p.Asn287Thr	missense	Exon 9 of 9	ENSP00000546423.1

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD2 exomes AF: 0.00000399 AC: 1 AN: 250754 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 6.85e-7 AC: 1 AN: 1459680 Hom.: 0 Cov.: 49 AF XY: 0.00 AC XY: 0 AN XY: 726226

African (AFR) AF: 0.00 AC: 0 AN: 33436

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86186

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52574

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4714

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111948

Other (OTH) AF: 0.00 AC: 0 AN: 60266

GnomAD4 genome Cov.: 29

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

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

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	18
DANN	Benign	0.93
DEOGEN2	Benign	0.28	T
Eigen	Benign	-0.67
Eigen_PC	Benign	-0.52
FATHMM_MKL	Benign	0.71	D
LIST_S2	Benign	0.25	T
M_CAP	Uncertain	0.089	D
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-0.52	T
MutationAssessor	Benign	0.0	N
PhyloP100		4.1
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-0.26	N
REVEL	Benign	0.17
Sift	Benign	0.33	T
Sift4G	Benign	0.20	T
Varity_R		0.061
gMVP		0.57
Mutation Taster		=85/15	polymorphism

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: rs1800354;

hg19: chr13-23898664;