rs369486176

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 10P and 1B. PM2PP5_Very_StrongBP4

The NM_176787.5(PIGN):c.1434+5G>A variant causes a splice donor 5th base, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000107 in 1,595,682 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 Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

PIGN
NM_176787.5 splice_donor_5th_base, intron

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7

Conservation

PhyloP100: 3.19

Variant links:

Genes affected

PIGN (HGNC:8967): (phosphatidylinositol glycan anchor biosynthesis class N) This gene encodes a protein that is involved in glycosylphosphatidylinositol (GPI)-anchor biosynthesis. The GPI-anchor is a glycolipid found on many blood cells and serves to anchor proteins to the cell surface. This protein is expressed in the endoplasmic reticulum and transfers phosphoethanolamine (EtNP) to the first mannose of the GPI anchor. Two alternatively spliced variants, which encode an identical isoform, have been reported. [provided by RefSeq, Jul 2008]

PIGN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 18-62113129-C-T is Pathogenic according to our data. Variant chr18-62113129-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 264636.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr18-62113129-C-T is described in Lovd as [Likely_pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.22355253).. Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PIGN	NM_176787.5 linkuse as main transcript	c.1434+5G>A		splice_donor_5th_base_variant, intron_variant		ENST00000640252.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PIGN	ENST00000640252.2 linkuse as main transcript	c.1434+5G>A		splice_donor_5th_base_variant, intron_variant		1	NM_176787.5	P1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152114

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000177

AC:

AN:

226090

Hom.:

AF XY:

0.00

AC XY:

AN XY:

122118

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000353

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000298

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000111

AC:

AN:

1443568

Hom.:

Cov.:

AF XY:

0.0000112

AC XY:

AN XY:

716772

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000119

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000136

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152114

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74304

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000189

ESP6500AA

AF:

0.000268

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000249

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Multiple congenital anomalies-hypotonia-seizures syndrome 1

Pathogenic:4

Likely pathogenic, criteria provided, single submitter	clinical testing	Neuberg Centre For Genomic Medicine, NCGM	-	The splice region variant c.1434+5G>A in PIGN (NM_176787.5) has been reported previously in affected indivduals (Fleming L et al). The variant as been submitted to ClinVar as Likely Pathogenic. The c.1434+5G>A variant is observed in 1/28,292 (0.0035%) alleles from individuals of South Asian background in gnomAD Exomes and is novel (not in any individuals) in 1000 Genomes. The nucleotide c.1434+5G>A in PIGN is predicted conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Likely Pathogenic. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Sep 28, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jan 28, 2024	This sequence change falls in intron 16 of the PIGN gene. It does not directly change the encoded amino acid sequence of the PIGN protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs369486176, gnomAD 0.004%). This variant has been observed in individual(s) with PIGN-related conditions (PMID: 26394714, 34051595, 35179230). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 264636). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Institute for Genomic Statistics and Bioinformatics, University Hospital Bonn	-	The NM_176787:exon17:c.1434+5G>A splice site mutation is a known pathogenic variant that has been maternally inherited. -

not provided

Pathogenic:3

Likely pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Oct 01, 2019	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 29, 2021	In silico analysis, which includes splice predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Not observed at a significant frequency in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 31589614, 34051595, 27535533, 27038415, 26394714) -
Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.29

Cadd

Benign

7.0

Dann

Benign

0.82

FATHMM_MKL

Uncertain

0.87

MetaRNN

Benign

0.22

T;T;T

MutationTaster

Benign

1.0

A;A

GERP RS

4.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.76

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.76

Position offset: 5

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