rs28941475

chr9-132349421-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3 PP5_Moderate

The NM_015046.7(SETX):c.8C>T(p.Thr3Ile) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. T3T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SETX NM_015046.7 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:3 U:2
• Conservation: PhyloP100: 4.09

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 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.837
• PP5: Variant 9-132349421-G-A is Pathogenic according to our data. Variant chr9-132349421-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2290.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr9-132349421-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SETX	NM_015046.7	c.8C>T	p.Thr3Ile	missense_variant	3/26	ENST00000224140.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SETX	ENST00000224140.6	c.8C>T	p.Thr3Ile	missense_variant	3/26	1	NM_015046.7	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3 Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Amyotrophic lateral sclerosis type 4 Pathogenic:2 Uncertain:1

Pathogenic, no assertion criteria provided	literature only	Northcott Neuroscience Laboratory, ANZAC Research Institute	-	- -
Uncertain significance, no assertion criteria provided	literature only	Inherited Neuropathy Consortium Ii, University Of Miami	Jan 06, 2016	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jun 01, 2004	- -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Aug 02, 2016

The T3I variant in the SETX gene has been reported previously in multiple families in association with hereditary motor neuropathies (Chen et al., 2004; Arning et al., 2013; Drew et al., 2015). The T3I variant was not observed in approximately 6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The T3I variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. The T3I variant is a strong candidate for a pathogenic variant. -

Distal spinal muscular atrophy Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

Inherited Neuropathy Consortium

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.54
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.21
Cadd	Pathogenic	27
Dann	Uncertain	1.0
DEOGEN2	Benign	0.32	T
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.79	T
M_CAP	Uncertain	0.26	D
MetaRNN	Pathogenic	0.84	D
MetaSVM	Uncertain	0.46	D
MutationAssessor	Benign	0.90	L
MutationTaster	Benign	0.42	A;A;A
PrimateAI	Uncertain	0.55	T
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.60
Sift	Uncertain	0.0020	D
Sift4G	Benign	0.071	T
Polyphen		0.99	D
Vest4		0.58
MutPred		0.74		Loss of disorder (P = 0.0126);
MVP		0.89
MPC		0.43
ClinPred		0.86	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.12
gMVP		0.41

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs28941475; hg19: chr9-135224808;