1-26794383-A-G

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBS1_SupportingBS2

The NM_017837.4(PIGV):c.349A>G(p.Ile117Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00163 in 1,614,180 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar.

Frequency

Genomes: 𝑓 0.00094 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0017 ( 4 hom. )

Consequence

PIGV
NM_017837.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:2

Conservation

PhyloP100: 0.325

Publications

5 publications found

Variant links:

Genes affected

PIGV (HGNC:26031): (phosphatidylinositol glycan anchor biosynthesis class V) This gene encodes a mannosyltransferase enzyme involved in the biosynthesis of glycosylphosphatidylinositol (GPI). GPI is a complex glycolipid that functions as a membrane anchor for many proteins and plays a role in multiple cellular processes including protein sorting and signal transduction. The encoded protein is localized to the endoplasmic reticulum and transfers the second mannose to the GPI backbone. Mutations in this gene are associated with hyperphosphatasia cognitive disability syndrome. Alternatively spliced transcript variants have been observed for this gene. [provided by RefSeq, Feb 2011]

PIGV Gene-Disease associations (from GenCC):

hyperphosphatasia with intellectual disability syndrome 1
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics, PanelApp Australia
hyperphosphatasia-intellectual disability syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

PIGV links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0114851).

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000939 (143/152288) while in subpopulation NFE AF = 0.00154 (105/68034). AF 95% confidence interval is 0.0013. There are 0 homozygotes in GnomAd4. There are 59 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PIGV	NM_017837.4 link	c.349A>G	p.Ile117Val	missense_variant	Exon 3 of 4	ENST00000674202.1	NP_060307.2	Q9NUD9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PIGV	ENST00000674202.1 link	c.349A>G	p.Ile117Val	missense_variant	Exon 3 of 4		NM_017837.4	ENSP00000501479.1		Q9NUD9

Frequencies

GnomAD3 genomes

AF:

0.000940

AC:

143

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000338

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000524

Gnomad ASJ

AF:

0.00374

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00154

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.00139

AC:

349

AN:

251466

AF XY:

0.00141

show subpopulations

Gnomad AFR exome

AF:

0.000369

Gnomad AMR exome

AF:

0.000896

Gnomad ASJ exome

AF:

0.00308

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.00229

Gnomad OTH exome

AF:

0.00212

GnomAD4 exome

AF:

0.00170

AC:

2482

AN:

1461892

Hom.:

Cov.:

AF XY:

0.00166

AC XY:

1209

AN XY:

727248

show subpopulations

African (AFR)

AF:

0.000299

AC:

AN:

33480

American (AMR)

AF:

0.000693

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00295

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.000187

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00260

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00202

AC:

2241

AN:

1112010

Other (OTH)

AF:

0.00146

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.476

Heterozygous variant carriers

142

284

425

567

709

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

156

234

312

390

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000939

AC:

143

AN:

152288

Hom.:

Cov.:

AF XY:

0.000792

AC XY:

AN XY:

74462

show subpopulations

African (AFR)

AF:

0.000337

AC:

AN:

41552

American (AMR)

AF:

0.000523

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00374

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.000414

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10598

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00154

AC:

105

AN:

68034

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00176

Hom.:

Bravo

AF:

0.00104

ExAC

AF:

0.00158

AC:

192

EpiCase

AF:

0.00196

EpiControl

AF:

0.00225

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Dec 31, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 19, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Oct 28, 2022

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Hyperphosphatasia with intellectual disability syndrome 1

Uncertain:2

Jun 18, 2020

New York Genome Center

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not specified

Uncertain:1

Mar 29, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: See c.348G>A. These two variants result in c.348_349delinsAG. (p.Ile117Val). Not reported. MAF 0.25%. Gene is associated with AR hyperphosphatasia with mental retardation syndrome. Severe end of the spectrum presents with multiple congenital anomalies, including Hirschsprung disease, vesicoureteral, and renal anomalies as well as anorectal malformations. Developmental delays, particular facial anomalies, brachytelephalangy, and hyperphosphatasia are consistently found. VUS3, but the gene may explain the patient's phenotype, so may report in IBA report. - OB 10/22/15: Decided to not include in the report, since it is a VUS3 in a recessive gene not well-associated with the patient's pehnotype, and the variant is heterozygous. -

PIGV-related disorder

Benign:1

Jun 22, 2022

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.085

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.37

CADD

Benign

9.2

(source)

DANN

Benign

0.37

DEOGEN2

Benign

0.30

T;.;T;.

Eigen

Benign

-0.61

Eigen_PC

Benign

-0.47

FATHMM_MKL

Benign

0.67

LIST_S2

Benign

0.64

.;T;T;T

M_CAP

Benign

0.075

MetaRNN

Benign

0.011

T;T;T;T

MetaSVM

Benign

-0.94

MutationAssessor

Benign

0.66

N;.;N;.

PhyloP100

0.33

PrimateAI

Benign

0.41

PROVEAN

Benign

-0.56

N;N;N;N

REVEL

Benign

0.20

Sift

Benign

0.59

T;T;T;T

Sift4G

Benign

0.67

T;T;T;T

Polyphen

0.0010

B;.;B;.

Vest4

0.080

MVP

0.74

MPC

0.12

ClinPred

0.0021

GERP RS

2.1

Varity_R

0.0095

gMVP

0.15

Mutation Taster

=92/8

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over