chr9-132278120-T-C

Variant names:

• chr9-132278120-T-C
• rs148041889
• NM_015046.7:c.6792A>G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_015046.7(SETX):​c.6792A>G​(p.Ile2264Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,814 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: SETX NM_015046.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 0.220

Genes affected

SETX (HGNC:445): (senataxin) This gene encodes a protein named for its homology to the Sen1p protein of fungi which has RNA helicase activity encoded by a domain at the C-terminal end of the protein. The protein encoded by this gene contains a DNA/RNA helicase domain at its C-terminal end which suggests that it may be involved in both DNA and RNA processing. Mutations in this gene have been associated with ataxia-ocular apraxia-2 (AOA2) and an autosomal dominant form of juvenile amyotrophic lateral sclerosis (ALS4). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.882

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SETX	NM_015046.7	c.6792A>G	p.Ile2264Met	missense_variant	Exon 21 of 26	ENST00000224140.6	NP_055861.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SETX	ENST00000224140.6	c.6792A>G	p.Ile2264Met	missense_variant	Exon 21 of 26	1	NM_015046.7	ENSP00000224140.5
SETX	ENST00000436441.5	c.1518A>G	p.Ile506Met	missense_variant	Exon 11 of 17	5		ENSP00000409143.1
SETX	ENST00000464133.1	n.-11A>G		upstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000795 AC: 2 AN: 251420 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135878

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461814 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727204

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 31

Alfa AF: 0.00000789 Hom.: 0

Bravo AF: 0.0000151

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease Uncertain:1

Nov 01, 2013

Dept. of Medical Genetics, Telemark Hospital Trust, Telemark Hospital Trust

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: research

- -

Spinocerebellar ataxia, autosomal recessive, with axonal neuropathy 2;C1865409:Amyotrophic lateral sclerosis type 4 Uncertain:1

Oct 25, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 157524). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on SETX protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This missense change has been observed in individuals with clinical features of autosomal recessive spinocerebellar ataxia (PMID: 19696032, 25025039; Invitae). This sequence change replaces isoleucine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 2264 of the SETX protein (p.Ile2264Met). This variant is present in population databases (rs148041889, gnomAD 0.007%). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.81
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.47
CADD	Benign	19
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.87	.;D
Eigen	Uncertain	0.36
Eigen_PC	Benign	0.18
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Uncertain	0.87	D;D
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.88	D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.3	.;M
PrimateAI	Uncertain	0.58	T
PROVEAN	Uncertain	-2.8	D;D
REVEL	Pathogenic	0.84
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.0050	D;D
Polyphen		1.0	.;D
Vest4		0.89
MVP		0.93
MPC		0.44
ClinPred		0.98	D
GERP RS		-1.6
Varity_R		0.77
gMVP		0.82

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

Other links and lift over

dbSNP: rs148041889; hg19: chr9-135153507;