rs147316771

Positions:

• chr9-35089199-A-G

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM2 BP4_Strong BP6 BS1

The NM_032634.4(PIGO):​c.3163T>C​(p.Phe1055Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00125 in 1,614,234 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00089 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0013 (1 hom.)
• Consequence: PIGO NM_032634.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:3
• Conservation: PhyloP100: 9.01

Genes affected

PIGO (HGNC:23215): (phosphatidylinositol glycan anchor biosynthesis class O) This gene encodes a protein that is involved in glycosylphosphatidylinositol (GPI)-anchor biosynthesis. The GPI-anchor is a glycolipid which contains three mannose molecules in its core backbone. The GPI-anchor is found on many blood cells and serves to anchor proteins to the cell surface. This protein is involved in the transfer of ethanolaminephosphate (EtNP) to the third mannose in GPI. At least three alternatively spliced transcripts encoding two distinct isoforms have been found for this gene. [provided by RefSeq, Jan 2011]

PIGO (HGNC:):

ACMG classification

Verdict is Benign. Variant got -7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.047749847).
• BP6: Variant 9-35089199-A-G is Benign according to our data. Variant chr9-35089199-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 378364.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=4}.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000886 (135/152344) while in subpopulation NFE AF= 0.0015 (102/68034). AF 95% confidence interval is 0.00126. There are 0 homozygotes in gnomad4. There are 50 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PIGO	NM_032634.4	c.3163T>C	p.Phe1055Leu	missense_variant	11/11	ENST00000378617.4	NP_116023.2
PIGO	NM_001201484.2	c.1912T>C	p.Phe638Leu	missense_variant	13/13		NP_001188413.1
PIGO	NM_152850.4	c.1912T>C	p.Phe638Leu	missense_variant	12/12		NP_690577.2
PIGO	XM_005251619.4	c.3163T>C	p.Phe1055Leu	missense_variant	11/11		XP_005251676.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PIGO	ENST00000378617.4	c.3163T>C	p.Phe1055Leu	missense_variant	11/11	1	NM_032634.4	ENSP00000367880.3

Frequencies

GnomAD3 genomes AF: 0.000887 AC: 135 AN: 152226 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00987

Gnomad AMR AF: 0.000981

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000941

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00150

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.000799 AC: 201 AN: 251450 Hom.: 1 AF XY: 0.000883 AC XY: 120 AN XY: 135910

Gnomad AFR exome AF: 0.000308

Gnomad AMR exome AF: 0.000665

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.000139

Gnomad NFE exome AF: 0.00141

Gnomad OTH exome AF: 0.00147

GnomAD4 exome AF: 0.00129 AC: 1881 AN: 1461890 Hom.: 1 Cov.: 34 AF XY: 0.00124 AC XY: 900 AN XY: 727246

Gnomad4 AFR exome AF: 0.000209

Gnomad4 AMR exome AF: 0.000872

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.000168

Gnomad4 NFE exome AF: 0.00156

Gnomad4 OTH exome AF: 0.00137

GnomAD4 genome AF: 0.000886 AC: 135 AN: 152344 Hom.: 0 Cov.: 33 AF XY: 0.000671 AC XY: 50 AN XY: 74488

Gnomad4 AFR AF: 0.000120

Gnomad4 AMR AF: 0.000980

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000941

Gnomad4 NFE AF: 0.00150

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00145 Hom.: 0

Bravo AF: 0.000937

TwinsUK AF: 0.00108 AC: 4

ALSPAC AF: 0.00156 AC: 6

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.00209 AC: 18

ExAC AF: 0.000684 AC: 83

EpiCase AF: 0.00136

EpiControl AF: 0.00154

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hyperphosphatasia with intellectual disability syndrome 2 Uncertain:2 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	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. -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 26, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -

not provided Uncertain:2 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jan 23, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden	Apr 23, 2019	PP3, BS2 -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jul 29, 2024	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Intellectual disability Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Centre de Biologie Pathologie Génétique, Centre Hospitalier Universitaire de Lille

Jan 01, 2019

- -

PIGO-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Oct 23, 2023

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	Pathogenic	0.96
BayesDel_addAF	Benign	-0.012	T
BayesDel_noAF	Pathogenic	0.18
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.077	.;.;T
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.88	.;D;D
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.048	T;T;T
MetaSVM	Benign	-0.88	T
MutationAssessor	Benign	2.0	.;.;M
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-2.5	D;D;D
REVEL	Uncertain	0.42
Sift	Benign	0.17	T;T;D
Sift4G	Benign	0.33	T;T;T
Polyphen		1.0	D;D;D
Vest4		0.74
MutPred		0.28		.;.;Loss of helix (P = 0.0795);
MVP		0.69
MPC		0.70
ClinPred		0.077	T
GERP RS		5.2
Varity_R		0.65
gMVP		0.50

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

Other links and lift over

dbSNP: rs147316771; hg19: chr9-35089196;