X-154412130-G-C

Variant names:

• chrX-154412130-G-C
• rs794729166
• NM_000116.5:c.154G>C

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4 BS2

The NM_000116.5(TAFAZZIN):​c.154G>C​(p.Glu52Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000823 in 1,094,082 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 3 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E52K) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 24)
  • Exomes 𝑓: 0.0000082 (0 hom. 3 hem.)
• Consequence: TAFAZZIN NM_000116.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.03
• Publications: 0 publications found

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

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.39899912).
• BS2: High Hemizygotes in GnomAdExome4 at 3 XL gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000116.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAFAZZIN	NM_000116.5	MANE Select	c.154G>C	p.Glu52Gln	missense	Exon 2 of 11	NP_000107.1
	TAFAZZIN	NM_001440856.1		c.208G>C	p.Glu70Gln	missense	Exon 2 of 11	NP_001427785.1
	TAFAZZIN	NM_001303465.2		c.208G>C	p.Glu70Gln	missense	Exon 2 of 10	NP_001290394.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAFAZZIN	ENST00000601016.6	TSL:1 MANE Select	c.154G>C	p.Glu52Gln	missense	Exon 2 of 11	ENSP00000469981.1
	TAFAZZIN	ENST00000475699.6	TSL:1	c.208G>C	p.Glu70Gln	missense	Exon 2 of 10	ENSP00000419854.3
	TAFAZZIN	ENST00000612460.5	TSL:1	c.154G>C	p.Glu52Gln	missense	Exon 2 of 10	ENSP00000481037.1

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome AF: 0.00000823 AC: 9 AN: 1094082 Hom.: 0 Cov.: 33 AF XY: 0.00000833 AC XY: 3 AN XY: 360164

African (AFR) AF: 0.00 AC: 0 AN: 26354

American (AMR) AF: 0.00 AC: 0 AN: 34932

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19282

East Asian (EAS) AF: 0.00 AC: 0 AN: 30092

South Asian (SAS) AF: 0.000150 AC: 8 AN: 53428

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 39678

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4132

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 840249

Other (OTH) AF: 0.0000218 AC: 1 AN: 45935

GnomAD4 genome Cov.: 24

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

Jan 04, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with glutamine, which is neutral and polar, at codon 52 of the TAZ protein (p.Glu52Gln). 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. 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

Apr 04, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.E52Q variant (also known as c.154G>C), located in coding exon 2 of the TAZ gene, results from a G to C substitution at nucleotide position 154. The glutamic acid at codon 52 is replaced by glutamine, an amino acid with highly similar properties. This amino acid position is not 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 v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.059	T
BayesDel_noAF	Benign	-0.15
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.35	T
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D
M_CAP	Pathogenic	0.33	D
MetaRNN	Benign	0.40	T
MetaSVM	Uncertain	0.48	D
MutationAssessor	Benign	1.5	L
PhyloP100		4.0
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-0.51	N
REVEL	Uncertain	0.44
Sift	Benign	0.21	T
Sift4G	Benign	0.16	T
Polyphen		0.98	D
Vest4		0.22
MutPred		0.47		Gain of ubiquitination at K56 (P = 0.0985)
MVP		0.94
ClinPred		0.82	D
GERP RS		4.1
PromoterAI		-0.065	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.34
gMVP		0.79
Mutation Taster		=86/14	polymorphism

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

Other links and lift over

dbSNP: rs794729166; hg19: chrX-153640467;