rs146722795

Variant names:

• chr13-23337095-G-T
• rs146722795
• NM_014363.6:c.6781C>A

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_001437336.1(SACS):​c.6808C>A​(p.Leu2270Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00531 in 1,613,958 control chromosomes in the GnomAD database, including 28 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0047 (5 hom., cov: 33)
  • Exomes 𝑓: 0.0054 (23 hom.)
• Consequence: SACS NM_001437336.1 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:10
• Conservation: PhyloP100: 7.76
• Publications: 10 publications found

Genes affected

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: Orphanet, G2P, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), Myriad Women’s Health

ACMG classification

Our verdict: Benign. The variant received -13 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.010582924).
• BP6: Variant 13-23337095-G-T is Benign according to our data. Variant chr13-23337095-G-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 240901.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00474 (722/152248) while in subpopulation NFE AF = 0.00543 (369/68004). AF 95% confidence interval is 0.00497. There are 5 homozygotes in GnomAd4. There are 429 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 5 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001437336.1. 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
	SACS	NM_014363.6	MANE Select	c.6781C>A	p.Leu2261Ile	missense	Exon 10 of 10	NP_055178.3
	SACS	NM_001437336.1		c.6808C>A	p.Leu2270Ile	missense	Exon 11 of 11	NP_001424265.1
	SACS	NM_001278055.2		c.6340C>A	p.Leu2114Ile	missense	Exon 8 of 8	NP_001264984.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SACS	ENST00000382292.9	TSL:5 MANE Select	c.6781C>A	p.Leu2261Ile	missense	Exon 10 of 10	ENSP00000371729.3
	SACS	ENST00000455470.6	TSL:1	c.2431+4350C>A		intron	N/A	ENSP00000406565.2
	SACS	ENST00000682944.1		c.6808C>A	p.Leu2270Ile	missense	Exon 11 of 11	ENSP00000507173.1

Frequencies

GnomAD3 genomes AF: 0.00475 AC: 722 AN: 152130 Hom.: 5 Cov.: 33

Gnomad AFR AF: 0.00109

Gnomad AMI AF: 0.0197

Gnomad AMR AF: 0.000458

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0258

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00543

Gnomad OTH AF: 0.00478

GnomAD2 exomes AF: 0.00477 AC: 1198 AN: 250910 AF XY: 0.00474

Gnomad AFR exome AF: 0.000744

Gnomad AMR exome AF: 0.000231

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.0210

Gnomad NFE exome AF: 0.00622

Gnomad OTH exome AF: 0.00295

GnomAD4 exome AF: 0.00536 AC: 7841 AN: 1461710 Hom.: 23 Cov.: 37 AF XY: 0.00504 AC XY: 3667 AN XY: 727156

African (AFR) AF: 0.000836 AC: 28 AN: 33478

American (AMR) AF: 0.000291 AC: 13 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.0000766 AC: 2 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39682

South Asian (SAS) AF: 0.00 AC: 0 AN: 86248

European-Finnish (FIN) AF: 0.0201 AC: 1076 AN: 53402

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00586 AC: 6515 AN: 1111900

Other (OTH) AF: 0.00343 AC: 207 AN: 60386

GnomAD4 genome AF: 0.00474 AC: 722 AN: 152248 Hom.: 5 Cov.: 33 AF XY: 0.00576 AC XY: 429 AN XY: 74440

African (AFR) AF: 0.00108 AC: 45 AN: 41558

American (AMR) AF: 0.000457 AC: 7 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5172

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.0258 AC: 273 AN: 10600

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00543 AC: 369 AN: 68004

Other (OTH) AF: 0.00473 AC: 10 AN: 2112

Alfa AF: 0.00488 Hom.: 7

Bravo AF: 0.00296

TwinsUK AF: 0.00566 AC: 21

ALSPAC AF: 0.00545 AC: 21

ESP6500AA AF: 0.000681 AC: 3

ESP6500EA AF: 0.00524 AC: 45

ExAC AF: 0.00482 AC: 585

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.00398

EpiControl AF: 0.00593

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	2	4	Charlevoix-Saguenay spastic ataxia (6)
-	-	3	not provided (3)
-	-	1	Hereditary spastic paraplegia (1)
-	-	1	SACS-related disorder (1)
-	-	1	Spastic paraplegia (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Benign	-0.083	T
BayesDel_noAF	Uncertain	0.12
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Benign	0.27	T
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	0.98	D
MetaRNN	Benign	0.011	T
MetaSVM	Uncertain	0.38	D
MutationAssessor	Uncertain	2.1	M
PhyloP100		7.8
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	-0.88	N
REVEL	Pathogenic	0.79
Sift	Benign	0.17	T
Sift4G	Pathogenic	0.0	D
Polyphen		0.82	P
Vest4		0.67
MVP		0.85
ClinPred		0.019	T
GERP RS		5.8
Varity_R		0.16
gMVP		0.43
Mutation Taster		=65/35	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

Other links and lift over

dbSNP: rs146722795; hg19: chr13-23911234;