19-1104778-G-C

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2BP4_ModerateBS1_Supporting

The NM_002085.5(GPX4):c.85-408G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000123 in 988,918 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00034 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000084 ( 0 hom. )

Consequence

GPX4
NM_002085.5 intron

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.0850

Variant links:

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]

GPX4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.16870055).

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000344 (52/151366) while in subpopulation AMR AF= 0.00204 (31/15208). AF 95% confidence interval is 0.00148. There are 0 homozygotes in gnomad4. There are 22 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
GPX4	NM_002085.5 linkuse as main transcript	c.85-408G>C		intron_variant		ENST00000354171.13
GPX4	NM_001039848.4 linkuse as main transcript	c.44G>C	p.Arg15Pro	missense_variant	1/7
GPX4	NM_001039847.3 linkuse as main transcript	c.85-408G>C		intron_variant
GPX4	NM_001367832.1 linkuse as main transcript	c.4-408G>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GPX4	ENST00000354171.13 linkuse as main transcript	c.85-408G>C		intron_variant		1	NM_002085.5	P3	P36969-1

Frequencies

GnomAD3 genomes

AF:

0.000344

AC:

AN:

151258

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000194

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00204

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00318

Gnomad NFE

AF:

0.000103

Gnomad OTH

AF:

0.00240

GnomAD4 exome

AF:

0.0000836

AC:

AN:

837552

Hom.:

Cov.:

AF XY:

0.0000852

AC XY:

AN XY:

387188

show subpopulations

Gnomad4 AFR exome

AF:

0.000126

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:

0.0000786

Gnomad4 OTH exome

AF:

0.000292

GnomAD4 genome

AF:

0.000344

AC:

AN:

151366

Hom.:

Cov.:

AF XY:

0.000298

AC XY:

AN XY:

73944

show subpopulations

Gnomad4 AFR

AF:

0.000193

Gnomad4 AMR

AF:

0.00204

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000103

Gnomad4 OTH

AF:

0.00238

Bravo

AF:

0.000518

ExAC

AF:

0.000118

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 16, 2022

The c.44G>C (p.R15P) 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 44, causing the arginine (R) at amino acid position 15 to be replaced by a proline (P). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 06, 2022

This sequence change replaces arginine, which is basic and polar, with proline, which is neutral and non-polar, at codon 15 of the GPX4 protein (p.Arg15Pro). This variant is present in population databases (rs755894874, gnomAD 0.3%). This variant has not been reported in the literature in individuals affected with GPX4-related conditions. ClinVar contains an entry for this variant (Variation ID: 1523088). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.11

BayesDel_noAF

Benign

-0.39

Cadd

Benign

Dann

Benign

0.62

FATHMM_MKL

Benign

0.37

MetaRNN

Benign

0.17

T;T;T

MutationTaster

Benign

1.0

D;D

PrimateAI

Pathogenic

0.90

Sift4G

Pathogenic

0.0

D;D;D

Vest4

0.38

MVP

0.71

GERP RS

1.6

RBP_binding_hub_radar

1.1

RBP_regulation_power_radar

3.4

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

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