X-154420709-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM1BS2

The NM_000116.5(TAFAZZIN):c.751C>T(p.Arg251Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000405 in 1,209,050 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 21 hemizygotes in GnomAD. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000054 ( 0 hom., 2 hem., cov: 23)

Exomes 𝑓: 0.000039 ( 0 hom. 19 hem. )

Consequence

TAFAZZIN
NM_000116.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 1.56

Variant links:

Genes affected

TAFAZZIN (HGNC:11577): (tafazzin, phospholipid-lysophospholipid transacylase) This gene encodes a protein that is expressed at high levels in cardiac and skeletal muscle. Mutations in this gene have been associated with a number of clinical disorders including Barth syndrome, dilated cardiomyopathy (DCM), hypertrophic DCM, endocardial fibroelastosis, and left ventricular noncompaction (LVNC). Multiple transcript variants encoding different isoforms have been described. A long form and a short form of each of these isoforms is produced; the short form lacks a hydrophobic leader sequence and may exist as a cytoplasmic protein rather than being membrane-bound. Other alternatively spliced transcripts have been described but the full-length nature of all these transcripts is not known. [provided by RefSeq, Jul 2008]

TAFAZZIN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM1

In a chain Tafazzin (size 261) in uniprot entity TAZ_HUMAN there are 6 pathogenic changes around while only 0 benign (100%) in NM_000116.5

BS2

High Hemizygotes in GnomAd4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TAFAZZIN	NM_000116.5 link	c.751C>T	p.Arg251Trp	missense_variant	Exon 10 of 11	ENST00000601016.6	NP_000107.1	Q16635-1A0A0S2Z4K0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TAFAZZIN	ENST00000601016.6 link	c.751C>T	p.Arg251Trp	missense_variant	Exon 10 of 11	1	NM_000116.5	ENSP00000469981.1		Q16635-1

Frequencies

GnomAD3 genomes

AF:

0.0000541

AC:

AN:

110874

Hom.:

Cov.:

AF XY:

0.0000605

AC XY:

AN XY:

33072

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.000114

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000273

AC:

AN:

183450

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

67894

show subpopulations

Gnomad AFR exome

AF:

0.00

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:

0.0000625

Gnomad NFE exome

AF:

0.0000488

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000392

AC:

AN:

1098176

Hom.:

Cov.:

AF XY:

0.0000523

AC XY:

AN XY:

363534

show subpopulations

Gnomad4 AFR exome

AF:

0.0000379

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:

0.0000494

Gnomad4 NFE exome

AF:

0.0000475

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000541

AC:

AN:

110874

Hom.:

Cov.:

AF XY:

0.0000605

AC XY:

AN XY:

33072

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000114

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.0000642

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Apr 29, 2016

The p.Arg251Trp variant in TAZ has not been previously reported in individuals w ith cardiomyopathy, but has been identified in 2/47966 European chromosomes by t he Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs3 72689133). Computational prediction tools and conservation analysis do not provi de strong support for or against an impact to the protein. In summary, the clini cal significance of the p.Arg251Trp variant is uncertain. -

3-Methylglutaconic aciduria type 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 06, 2024

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 251 of the TAZ protein (p.Arg251Trp). This variant is present in population databases (rs372689133, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with TAZ-related conditions. ClinVar contains an entry for this variant (Variation ID: 202095). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. 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. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Mar 10, 2014

p.Arg251Trp (CGG>TGG): c.751 C>T in exon 10 of the TAZ gene (NM_000116.3). A variant of unknown significance has been identified in the TAZ gene. The R251W variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. The R251W 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 R251W 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 in mammals. In silico analysis predicts this variant likely does not alter the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic mutation or a rare benign variant. The variant is found in MITONUC-MITOP panel(s). -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 22, 2024

The p.R251W variant (also known as c.751C>T), located in coding exon 10 of the TAZ gene, results from a C to T substitution at nucleotide position 751. The arginine at codon 251 is replaced by tryptophan, an amino acid with dissimilar properties. Based on data from gnomAD, the T allele has an overall frequency of 0.0034% (7/204723) total alleles studied, with 2 hemizygote(s) observed. The highest observed frequency was 0.0065% (6/92362) of European (non-Finnish) alleles. This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Uncertain

0.080

BayesDel_noAF

Uncertain

-0.010

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.54

.;.;.;D;.

FATHMM_MKL

Benign

0.70

LIST_S2

Uncertain

0.91

D;D;D;D;D

M_CAP

Pathogenic

0.73

MetaRNN

Uncertain

0.46

T;T;T;T;T

MetaSVM

Pathogenic

0.89

MutationAssessor

Benign

1.4

.;.;.;L;.

PrimateAI

Uncertain

0.53

PROVEAN

Uncertain

-3.3

.;.;.;.;D

REVEL

Uncertain

0.50

Sift

Benign

0.091

.;.;.;.;T

Sift4G

Benign

0.13

T;T;T;T;T

Polyphen

0.99

D;B;B;D;.

Vest4

0.44

MVP

0.95

ClinPred

0.27

GERP RS

4.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.16

gMVP

0.82

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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