Variant rs121908687 details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_003560.4(PLA2G6):c.2239C>T(p.Arg747Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000178 in 1,402,052 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000018 ( 0 hom. )

Consequence

PLA2G6
NM_003560.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8

Conservation

PhyloP100: 2.01

Variant links:

Genes affected

PLA2G6 (HGNC:9039): (phospholipase A2 group VI) The protein encoded by this gene is an A2 phospholipase, a class of enzyme that catalyzes the release of fatty acids from phospholipids. The encoded protein may play a role in phospholipid remodelling, arachidonic acid release, leukotriene and prostaglandin synthesis, fas-mediated apoptosis, and transmembrane ion flux in glucose-stimulated B-cells. Several transcript variants encoding multiple isoforms have been described, but the full-length nature of only three of them have been determined to date. [provided by RefSeq, Dec 2010]

PLA2G6 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.984

PP5

Variant 22-38112541-G-A is Pathogenic according to our data. Variant chr22-38112541-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 6204.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr22-38112541-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PLA2G6	NM_003560.4 link	c.2239C>T	p.Arg747Trp	missense_variant	Exon 16 of 17	ENST00000332509.8	NP_003551.2	O60733-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PLA2G6	ENST00000332509.8 link	c.2239C>T	p.Arg747Trp	missense_variant	Exon 16 of 17	1	NM_003560.4	ENSP00000333142.3		O60733-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000258

AC:

AN:

155016

Hom.:

AF XY:

0.00

AC XY:

AN XY:

83066

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000118

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000129

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000178

AC:

AN:

1402052

Hom.:

Cov.:

AF XY:

0.0000173

AC XY:

AN XY:

692434

show subpopulations

Gnomad4 AFR exome

AF:

0.0000316

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.0000396

Gnomad4 EAS exome

AF:

0.0000279

Gnomad4 SAS exome

AF:

0.000125

Gnomad4 FIN exome

AF:

0.0000213

Gnomad4 NFE exome

AF:

0.00000832

Gnomad4 OTH exome

AF:

0.0000344

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000896

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.00000910

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Autosomal recessive Parkinson disease 14

Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München	Jun 04, 2021	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Feb 01, 2009	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Sep 11, 2014	This variant has been previously reported as disease-causing and was found once in our laboratory homozygous in a 24-year-old male with adult-onset progressive lower limb weakness/stiffness, spastic gait, hyperthyroidism, diffuse brain atrophy, simialrly affected brother (not tested). -
Pathogenic, criteria provided, single submitter	clinical testing	Lifecell International Pvt. Ltd	-	A Homozygote Missense variant c.2239C>T in Exon 16 of the PLA2G6 gene that results in the amino acid substitution p.Arg747Trp was identified. The observed variant has a minor allele frequency of 0.0003% in gnomAD exomes and genomes, respectively. The severity of the impact of this variant on the protein is medium, based on the effect of the protein and REVEL score. Rare Exome Variant Ensemble Learner (REVEL) is an ensembl method for predicting the pathogenicity of missense variants based on a combination of scores from 13 individual tools: MutPred, FATHMM v2.3, VEST 3.0, PolyPhen-2, SIFT, PROVEAN, MutationAssessor, MutationTaster, LRT, GERP++, SiPhy, phyloP, and phastCons. The REVEL score for an individual missense variant can range from 0 to 1, with higher scores reflecting greater likelihood that the variant is disease-causing. The variant has been reported to ClinVar as Pathogenic/Likely pathogenicwith a status of (2 stars) criteria provided, multiple submitters, no conflicts (Variation ID 6204 as of 2022-12-24). Mutations in the gene have been associated with alterations in PLA2G6 function produce the different disease phenotypes of NBIA/INAD and dystonia-parkinsonism. INAD/NBIA is caused by loss of the ability of PLA2G6 to catalyze fatty acid release from phospholipids (Paisan-Ruiz C et al., 2009; Engel LA et al., 2010). Based on the above evidence this variant has been classified as Pathogenic according to the ACMG guidelines. -

Infantile neuroaxonal dystrophy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 23, 2024

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 747 of the PLA2G6 protein (p.Arg747Trp). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individuals with PLA2G6-related conditions (PMID: 18570303, 27127721, 28295203). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 6204). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt PLA2G6 protein function with a positive predictive value of 80%. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on PLA2G6 function (PMID: 20886109, 26755131). This variant disrupts the p.Arg747 amino acid residue in PLA2G6. Other variant(s) that disrupt this residue have been observed in individuals with PLA2G6-related conditions (PMID: 35861376; internal data), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Oct 23, 2020

- -

PLA2G6-associated neurodegeneration

Pathogenic:1

Pathogenic, criteria provided, single submitter

curation

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Jan 24, 2023

The p.Arg747Trp variant in PLA2G6 has been reported at least 6 individuals with PLA2G6-associated neurodegeneration (PMID: 18570303, 27127721, 30868093, 28295203, 35152491, Park_2019), segregated with disease in 2 affected relatives from 2 families (PMID: 28295203, Park_2019), and has been identified in 0.01% (3/23206) of South Asian chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs751225193). Although this variant has been seen in the general population in a heterozygous state, its frequency is not high enough to rule out a pathogenic role. Of the 6 affected individuals, all were homozygotes, which increases the likelihood that the p.Arg747Trp variant is pathogenic (PMID: 18570303, 27127721, 30868093, 28295203, 35152491, Park_2019). This variant has also been reported in ClinVar (Variation ID#: 6204) and has been interpreted as pathogenic or likely pathogenic by Fulgent Genetics, Baylor Genetics, Institute of Medical Genetics and Applied Genomics (University Hospital T√ºbingen), and OMIM. In vitro functional studies provide some evidence that the p.Arg747Trp variant may impact protein function (PMID: 26001724, 26755131, 20886109). However, these types of assays may not accurately represent biological function. Animal models in mice have shown that this variant causes PLA2G6-associated neurodegeneration (PMID: 26755131). Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. The phenotype of individuals homozygous for this variant is highly specific for PLA2G6-associated neurodegeneration based on brain iron accumulation on MRI consistent with disease (PMID: 30868093, 28295203). In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive PLA2G6-associated neurodegeneration. ACMG/AMP Criteria applied: PM3, PP3, PS3, PP1, PP4 (Richards 2015). -

Infantile neuroaxonal dystrophy;C1857747:Neurodegeneration with brain iron accumulation 2B;C2751842:Autosomal recessive Parkinson disease 14

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.38

BayesDel_addAF

Pathogenic

0.35

BayesDel_noAF

Pathogenic

0.26

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.81

D;.;.

Eigen

Uncertain

0.50

Eigen_PC

Uncertain

0.41

FATHMM_MKL

Uncertain

0.86

LIST_S2

Pathogenic

0.99

D;D;.

M_CAP

Pathogenic

0.58

MetaRNN

Pathogenic

0.98

D;D;D

MetaSVM

Uncertain

0.46

MutationAssessor

Pathogenic

3.3

M;.;.

PrimateAI

Uncertain

0.76

PROVEAN

Pathogenic

-6.3

D;D;D

REVEL

Pathogenic

0.81

Sift

Pathogenic

0.0

D;D;D

Sift4G

Pathogenic

0.0010

D;D;D

Polyphen

1.0

D;D;D

Vest4

0.92

MutPred

0.94

Gain of helix (P = 0.0117);.;.;

MVP

0.94

MPC

0.90

ClinPred

0.90

GERP RS

4.5

Varity_R

0.51

gMVP

0.73

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