17-3664199-A-G

Position:

• chr17-3664199-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_014604.4(TAX1BP3):​c.233T>C​(p.Met78Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000958 in 1,461,784 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 Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000096 (0 hom.)
• Consequence: TAX1BP3 NM_014604.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 8.82

Genes affected

TAX1BP3 (HGNC:30684): (Tax1 binding protein 3) This gene encodes a small, highly conserved protein with a single PDZ domain. PDZ (PSD-95/Discs large/ZO-1 homologous) domains promote protein-protein interactions that affect cell signaling, adhesion, protein scaffolding, and receptor and ion transporter functions. The encoded protein interacts with a large number of target proteins that play roles in signaling pathways; for example, it interacts with Rho A and glutaminase L and also acts as a negative regulator of the Wnt/beta-catenin signaling pathway. This protein was first identified as binding to the T-cell leukaemia virus (HTLV1) Tax oncoprotein. Overexpression of this gene has been implicated in altered cancer cell adhesion, migration and metastasis. The encoded protein also modulates the localization and density of inwardly rectifying potassium channel 2.3 (Kir2.3). To date, this protein has been shown to play a role in cell proliferation, development, stress response, and polarization. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Apr 2017]

P2RX5-TAX1BP3 (HGNC:49191): (P2RX5-TAX1BP3 readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring P2RX5 (purinergic receptor P2X, ligand-gated ion channel, 5) and TAX1BP3 (Tax1 binding protein 3) genes on chromosome 17. The read-through transcript is a candidate for nonsense-mediated mRNA decay (NMD), and is thus unlikely to produce a protein product. [provided by RefSeq, Mar 2011]

P2RX5-TAX1BP3 (HGNC:):

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, 0.88
• PP5: Variant 17-3664199-A-G is Pathogenic according to our data. Variant chr17-3664199-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 598745.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TAX1BP3	NM_014604.4	c.233T>C	p.Met78Thr	missense_variant	3/4	ENST00000225525.4	NP_055419.1
TAX1BP3	NM_001204698.2	c.160-314T>C		intron_variant			NP_001191627.1
P2RX5-TAX1BP3	NR_037928.1	n.5288T>C		non_coding_transcript_exon_variant	14/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TAX1BP3	ENST00000225525.4	c.233T>C	p.Met78Thr	missense_variant	3/4	1	NM_014604.4	ENSP00000225525.3
P2RX5-TAX1BP3	ENST00000550383.1	n.*3590T>C		non_coding_transcript_exon_variant	14/15	2		ENSP00000455681.1
P2RX5-TAX1BP3	ENST00000550383.1	n.*3590T>C		3_prime_UTR_variant	14/15	2		ENSP00000455681.1
TAX1BP3	ENST00000611779.4	c.160-314T>C		intron_variant		2		ENSP00000484776.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000958 AC: 14 AN: 1461784 Hom.: 0 Cov.: 35 AF XY: 0.00000825 AC XY: 6 AN XY: 727176

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: 0.0000108

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

TAX1BP3-related arrhythmogenic right ventricular cardiomyopathy Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Undiagnosed Diseases Network, NIH

Nov 27, 2018

A hemizygous c.233T>C (p.M78T) variant in the TAX1BP3 gene was detected in three brothers (14yo male, 20yo male, and male that died suddently at age 17) with similar symptoms. Exome sequencing showed that all three brothers are hemizygous, the mother is heterozygous, and the father is negative for this change. Concurrent array analysis revealed a heterozygous copy number loss of approximately 238 Kb in size (genomic position chr17:3394299- 3632836) in all three brothers. This large deletion encompasses the entire TAX1BP3 gene. SNP arrays detected this deletion as heterozygous in all three brothers and the father. The mother is negative for the deletion. Therefore, the 238 Kb deletion and the c.233T>C (p.M78T) variant are located on two chromosomes (in trans configuration). We believe the combination of the missense variant and deletion in trans is likely pathogenic. -

Primary familial dilated cardiomyopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Department of Molecular and Human Genetics, Baylor College of Medicine

Apr 16, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.10
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.072	T
Eigen	Uncertain	0.36
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.040	D
MetaRNN	Pathogenic	0.88	D
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	-0.38	N
PrimateAI	Pathogenic	0.88	D
PROVEAN	Uncertain	-3.6	D
REVEL	Uncertain	0.61
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0040	D
Polyphen		0.92	P
Vest4		0.90
MutPred		0.79		Loss of stability (P = 0.0889);
MVP		0.59
MPC		1.2
ClinPred		0.99	D
GERP RS		5.3
Varity_R		0.88
gMVP		0.70

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1307997067; hg19: chr17-3567493;