rs35799469

Positions:

chr13-23331227-T-C

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_014363.6(SACS):c.12649A>G(p.Asn4217Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00138 in 1,613,886 control chromosomes in the GnomAD database, including 24 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0073 ( 12 hom., cov: 32)

Exomes 𝑓: 0.00075 ( 12 hom. )

Consequence

SACS
NM_014363.6 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:8

Conservation

PhyloP100: 3.45

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0038977861).

BP6

Variant 13-23331227-T-C is Benign according to our data. Variant chr13-23331227-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 235607.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Likely_benign=5, Benign=2}. Variant chr13-23331227-T-C is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00735 (1119/152332) while in subpopulation AFR AF= 0.0253 (1052/41572). AF 95% confidence interval is 0.024. There are 12 homozygotes in gnomad4. There are 530 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 12 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SACS	NM_014363.6 link	c.12649A>G	p.Asn4217Asp	missense_variant	10/10	ENST00000382292.9	NP_055178.3	Q9NZJ4-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SACS	ENST00000382292.9 link	c.12649A>G	p.Asn4217Asp	missense_variant	10/10	5	NM_014363.6	ENSP00000371729.3		Q9NZJ4-1

Frequencies

GnomAD3 genomes

AF:

0.00736

AC:

1120

AN:

152214

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0254

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00353

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00382

GnomAD3 exomes

AF:

0.00196

AC:

492

AN:

250752

Hom.:

AF XY:

0.00144

AC XY:

195

AN XY:

135590

show subpopulations

Gnomad AFR exome

AF:

0.0272

Gnomad AMR exome

AF:

0.00119

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000706

Gnomad OTH exome

AF:

0.000328

GnomAD4 exome

AF:

0.000753

AC:

1101

AN:

1461554

Hom.:

Cov.:

AF XY:

0.000670

AC XY:

487

AN XY:

727074

show subpopulations

Gnomad4 AFR exome

AF:

0.0265

Gnomad4 AMR exome

AF:

0.00141

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000342

Gnomad4 OTH exome

AF:

0.00176

GnomAD4 genome

AF:

0.00735

AC:

1119

AN:

152332

Hom.:

Cov.:

AF XY:

0.00711

AC XY:

530

AN XY:

74498

show subpopulations

Gnomad4 AFR

AF:

0.0253

Gnomad4 AMR

AF:

0.00353

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00378

Alfa

AF:

0.00124

Hom.:

Bravo

AF:

0.00793

ESP6500AA

AF:

0.0227

AC:

100

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00222

AC:

269

Asia WGS

AF:

0.00115

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:8

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Charlevoix-Saguenay spastic ataxia

Uncertain:1Benign:2

Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Oct 18, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Likely benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Sep 05, 2021	- -

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jun 16, 2017	- -

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	May 21, 2015	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Aug 19, 2020	- -

Spastic paraplegia

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Hereditary spastic paraplegia

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Dec 12, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.078

BayesDel_addAF

Benign

-0.47

BayesDel_noAF

Benign

-0.43

CADD

Benign

DANN

Benign

0.86

DEOGEN2

Benign

0.21

.;T

Eigen

Benign

-0.29

Eigen_PC

Benign

-0.073

FATHMM_MKL

Uncertain

0.84

LIST_S2

Benign

0.78

T;T

MetaRNN

Benign

0.0039

T;T

MetaSVM

Benign

-0.82

MutationAssessor

Benign

0.20

.;N

PrimateAI

Uncertain

0.48

PROVEAN

Benign

-1.6

N;N

REVEL

Benign

0.28

Sift

Benign

0.78

T;T

Sift4G

Benign

0.14

T;T

Polyphen

0.022

.;B

Vest4

0.13

MVP

0.75

ClinPred

0.0081

GERP RS

4.3

Varity_R

0.11

gMVP

0.32

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over