chr9-35091690-G-C

Variant names:

• chr9-35091690-G-C
• rs748093757
• NM_032634.4:c.2197C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_032634.4(PIGO):​c.2197C>G​(p.Arg733Gly) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,460,246 control chromosomes in the GnomAD database, with no homozygous occurrence. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R733W) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: PIGO NM_032634.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.55
• Publications: 1 publications found

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 Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hyperphosphatasia with intellectual disability syndrome 2

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Illumina, Labcorp Genetics (formerly Invitae), PanelApp Australia
• hyperphosphatasia-intellectual disability syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_032634.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIGO	NM_032634.4	MANE Select	c.2197C>G	p.Arg733Gly	missense	Exon 7 of 11	NP_116023.2
	PIGO	NM_001201484.2		c.1345-399C>G		intron	N/A	NP_001188413.1
	PIGO	NM_152850.4		c.1345-399C>G		intron	N/A	NP_690577.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIGO	ENST00000378617.4	TSL:1 MANE Select	c.2197C>G	p.Arg733Gly	missense	Exon 7 of 11	ENSP00000367880.3
	PIGO	ENST00000298004.9	TSL:1	c.1345-399C>G		intron	N/A	ENSP00000298004.5
	PIGO	ENST00000907113.1		c.2197C>G	p.Arg733Gly	missense	Exon 7 of 11	ENSP00000577172.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1460246 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726486

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51814

Middle Eastern (MID) AF: 0.000173 AC: 1 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111996

Other (OTH) AF: 0.0000331 AC: 2 AN: 60370

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Hyperphosphatasia with intellectual disability syndrome 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
BayesDel_addAF	Benign	-0.0082	T
BayesDel_noAF	Benign	-0.25
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.24	T
Eigen	Benign	-0.21
Eigen_PC	Benign	-0.092
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.80	T
M_CAP	Benign	0.033	D
MetaRNN	Uncertain	0.54	D
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.0	L
PhyloP100		5.5
PrimateAI	Benign	0.42	T
PROVEAN	Uncertain	-3.1	D
REVEL	Benign	0.18
Sift	Benign	0.19	T
Sift4G	Benign	0.28	T
Polyphen		0.53	P
Vest4		0.54
MutPred		0.44		Gain of catalytic residue at V734 (P = 0.0295)
MVP		0.60
MPC		0.24
ClinPred		0.77	D
GERP RS		4.6
Varity_R		0.23
gMVP		0.26
Mutation Taster		=92/8	polymorphism

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

Other links and lift over

dbSNP: rs748093757; hg19: chr9-35091687;