X-154411880-C-T

Position:

• chrX-154411880-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 4P and 4B. PM1 PP3_Moderate BS2

The NM_000116.5(TAFAZZIN):​c.37C>T​(p.Pro13Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000458 in 1,091,049 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 2 hemizygotes in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. P13P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000046 (0 hom. 2 hem.)
• Consequence: TAFAZZIN NM_000116.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.00

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]

DNASE1L1 (HGNC:2957): (deoxyribonuclease 1 like 1) This gene encodes a deoxyribonuclease protein that shows high sequence similarity to DNase I. The encoded protein is localized to the endoplasmic reticulum and modified by N-linked glycosylation. Alternate transcriptional splice variants encoding the same protein have been observed. [provided by RefSeq, Jan 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM1: In a chain Tafazzin (size 261) in uniprot entity TAZ_HUMAN there are 37 pathogenic changes around while only 3 benign (93%) in NM_000116.5
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.867
• BS2: High Hemizygotes in GnomAdExome4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TAFAZZIN	NM_000116.5	c.37C>T	p.Pro13Ser	missense_variant	1/11	ENST00000601016.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TAFAZZIN	ENST00000601016.6	c.37C>T	p.Pro13Ser	missense_variant	1/11	1	NM_000116.5

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 0.00000458 AC: 5 AN: 1091049 Hom.: 0 Cov.: 31 AF XY: 0.00000557 AC XY: 2 AN XY: 359151

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: 0.00000595

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

3-Methylglutaconic aciduria type 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 05, 2023

This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 13 of the TAZ protein (p.Pro13Ser). This variant is not present in population databases (gnomAD no frequency). 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: 1799627). 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. -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 13, 2022

The p.P13S variant (also known as c.37C>T), located in coding exon 1 of the TAZ gene, results from a C to T substitution at nucleotide position 37. The proline at codon 13 is replaced by serine, an amino acid with similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Uncertain	26
DANN	Uncertain	1.0
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Pathogenic	0.88	D
MetaRNN	Pathogenic	0.87	D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.71	T
Sift4G	Uncertain	0.015	D;T;T;T;T;D;D;T
Polyphen		1.0, 1.0	.;D;D;.;D;D;.;.
Vest4		0.60, 0.55, 0.62, 0.56, 0.46
MutPred		0.53		Loss of catalytic residue at P13 (P = 0.0054);Loss of catalytic residue at P13 (P = 0.0054);Loss of catalytic residue at P13 (P = 0.0054);Loss of catalytic residue at P13 (P = 0.0054);Loss of catalytic residue at P13 (P = 0.0054);Loss of catalytic residue at P13 (P = 0.0054);Loss of catalytic residue at P13 (P = 0.0054);Loss of catalytic residue at P13 (P = 0.0054);
MVP		0.97
ClinPred		0.99	D
GERP RS		4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.59
gMVP		0.79

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

Other links and lift over

dbSNP: rs1557190850; hg19: chrX-153640217;