19-1104116-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002085.5(GPX4):c.73G>C(p.Ala25Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/17 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 34)
• Consequence: GPX4 NM_002085.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.627

Genes affected

GPX4 (HGNC:4556): (glutathione peroxidase 4) The protein encoded by this gene belongs to the glutathione peroxidase family, members of which catalyze the reduction of hydrogen peroxide, organic hydroperoxides and lipid hydroperoxides, and thereby protect cells against oxidative damage. Several isozymes of this gene family exist in vertebrates, which vary in cellular location and substrate specificity. This isozyme has a high preference for lipid hydroperoxides and protects cells against membrane lipid peroxidation and cell death. It is also required for normal sperm development; thus, it has been identified as a 'moonlighting' protein because of its ability to serve dual functions as a peroxidase, as well as a structural protein in mature spermatozoa. Mutations in this gene are associated with Sedaghatian type of spondylometaphyseal dysplasia (SMDS). This isozyme is also a selenoprotein, containing the rare amino acid selenocysteine (Sec) at its active site. Sec is encoded by the UGA codon, which normally signals translation termination. The 3' UTRs of selenoprotein mRNAs contain a conserved stem-loop structure, designated the Sec insertion sequence (SECIS) element, that is necessary for the recognition of UGA as a Sec codon, rather than as a stop signal. Transcript variants resulting from alternative splicing or use of alternate promoters have been described to encode isoforms with different subcellular localization. [provided by RefSeq, Dec 2018]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11210799).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GPX4	NM_002085.5	c.73G>C	p.Ala25Pro	missense_variant	1/7	ENST00000354171.13
GPX4	NM_001039847.3	c.73G>C	p.Ala25Pro	missense_variant	1/7
GPX4	NM_001367832.1	c.-9G>C		5_prime_UTR_variant	1/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GPX4	ENST00000354171.13	c.73G>C	p.Ala25Pro	missense_variant	1/7	1	NM_002085.5	P3

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 25, 2022

The c.73G>C (p.A25P) alteration is located in exon 1 (coding exon 1) of the GPX4 gene. This alteration results from a G to C substitution at nucleotide position 73, causing the alanine (A) at amino acid position 25 to be replaced by a proline (P). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
Cadd	Benign	17
Dann	Benign	0.81
DEOGEN2	Benign	0.025	T;T;.
Eigen	Benign	-0.93
Eigen_PC	Benign	-0.99
FATHMM_MKL	Benign	0.17	N
LIST_S2	Benign	0.64	T;T;.
MetaRNN	Benign	0.11	T;T;T
MetaSVM	Benign	-0.94	T
MutationTaster	Benign	1.0	N;N
Sift4G	Benign	0.18	T;.;.
Polyphen		0.17	.;B;.
Vest4		0.15
MutPred		0.59		Loss of catalytic residue at A25 (P = 0.007);Loss of catalytic residue at A25 (P = 0.007);Loss of catalytic residue at A25 (P = 0.007);
MVP		0.14
MPC		0.16
ClinPred		0.17	T
GERP RS		0.88
Varity_R		0.27

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-1104115;