21-37065607-G-A

Position:

chr21-37065607-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_153682.3(PIGP):c.380C>T(p.Ala127Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000211 in 1,612,950 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000096 ( 0 hom. )

Consequence

PIGP
NM_153682.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.472

Variant links:

Genes affected

PIGP (HGNC:3046): (phosphatidylinositol glycan anchor biosynthesis class P) This gene encodes an enzyme involved in the first step of glycosylphosphatidylinositol (GPI)-anchor biosynthesis. The GPI-anchor is a glycolipid found on many blood cells that serves to anchor proteins to the cell surface. The encoded protein is a component of the GPI-N-acetylglucosaminyltransferase complex that catalyzes the transfer of N-acetylglucosamine (GlcNAc) from UDP-GlcNAc to phosphatidylinositol (PI). This gene is located in the Down Syndrome critical region on chromosome 21 and is a candidate for the pathogenesis of Down syndrome. This gene has multiple pseudogenes and is a member of the phosphatidylinositol glycan anchor biosynthesis gene family. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Feb 2016]

PIGP links:

PIGP (HGNC:):

PIGP links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.047371864).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PIGP	NM_153682.3 linkuse as main transcript	c.380C>T	p.Ala127Val	missense_variant	5/5	ENST00000360525.9	NP_710149.1	P57054-2
PIGP	NM_153681.2 linkuse as main transcript	c.452C>T	p.Ala151Val	missense_variant	4/4		NP_710148.1	P57054-1
PIGP	NM_001320480.2 linkuse as main transcript	c.380C>T	p.Ala127Val	missense_variant	5/5		NP_001307409.1	P57054-2
PIGP	NM_016430.4 linkuse as main transcript	c.302C>T	p.Ala101Val	missense_variant	6/6		NP_057514.2	P57054-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PIGP	ENST00000360525.9 linkuse as main transcript	c.380C>T	p.Ala127Val	missense_variant	5/5	1	NM_153682.3	ENSP00000353719.3		P57054-2

Frequencies

GnomAD3 genomes

AF:

0.000132

AC:

AN:

152078

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000160

AC:

AN:

249500

Hom.:

AF XY:

0.0000148

AC XY:

AN XY:

135082

show subpopulations

Gnomad AFR exome

AF:

0.000247

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000958

AC:

AN:

1460754

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

726662

show subpopulations

Gnomad4 AFR exome

AF:

0.000389

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:

9.00e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.000131

AC:

AN:

152196

Hom.:

Cov.:

AF XY:

0.0000806

AC XY:

AN XY:

74424

show subpopulations

Gnomad4 AFR

AF:

0.000481

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000389

Hom.:

Bravo

AF:

0.000140

ESP6500AA

AF:

0.000908

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000412

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 27, 2023

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 151 of the PIGP protein (p.Ala151Val). This variant is present in population databases (rs139467537, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with PIGP-related conditions. ClinVar contains an entry for this variant (Variation ID: 1431817). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.55

CADD

Benign

DANN

Benign

0.86

DEOGEN2

Benign

0.012

.;T;.;.;.

Eigen

Benign

-0.69

Eigen_PC

Benign

-0.63

FATHMM_MKL

Benign

0.29

LIST_S2

Benign

0.56

.;T;.;T;T

M_CAP

Benign

0.0089

MetaRNN

Benign

0.047

T;T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.8

.;L;.;.;.

PrimateAI

Benign

0.23

PROVEAN

Benign

-0.87

N;N;N;N;N

REVEL

Benign

0.027

Sift

Benign

0.26

T;T;T;T;T

Sift4G

Benign

0.20

T;T;T;T;T

Polyphen

0.047

.;B;.;.;.

Vest4

0.094

MVP

0.19

MPC

0.010

ClinPred

0.026

GERP RS

3.7

Varity_R

0.026

gMVP

0.45

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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