17-36537747-C-G

Variant names:

• chr17-36537747-C-G
• rs147622852
• NM_001346754.2:c.646C>G

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001346754.2(PIGW):​c.646C>G​(p.Arg216Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,844 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R216Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PIGW NM_001346754.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.814
• Publications: 0 publications found

Genes affected

PIGW (HGNC:23213): (phosphatidylinositol glycan anchor biosynthesis class W) The protein encoded by this gene is an inositol acyltransferase that acylates the inositol ring of phosphatidylinositol. This occurs in the endoplasmic reticulum and is a step in the biosynthesis of glycosylphosphatidylinositol (GPI), which anchors many cell surface proteins to the membrane. Defects in this gene are a cause of the age-dependent epileptic encephalopathy West syndrome as well as a syndrome exhibiting hyperphosphatasia and cognitive disability (HPMRS5). [provided by RefSeq, Jul 2017]

MYO19 (HGNC:26234): (myosin XIX) Enables actin binding activity. Involved in regulation of cytokinesis and regulation of mitochondrial fission. Acts upstream of or within mitochondrion migration along actin filament. Located in cytosol and mitochondrial outer membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.964

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001346754.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIGW	NM_001346754.2	MANE Select	c.646C>G	p.Arg216Gly	missense	Exon 2 of 2	NP_001333683.1	Q7Z7B1
	PIGW	NM_001346755.2		c.646C>G	p.Arg216Gly	missense	Exon 2 of 2	NP_001333684.1	Q7Z7B1
	PIGW	NM_178517.5		c.646C>G	p.Arg216Gly	missense	Exon 2 of 2	NP_848612.2	Q7Z7B1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIGW	ENST00000614443.2	TSL:1 MANE Select	c.646C>G	p.Arg216Gly	missense	Exon 2 of 2	ENSP00000482202.1	Q7Z7B1
	PIGW	ENST00000619326.1	TSL:1	c.646C>G	p.Arg216Gly	missense	Exon 2 of 2	ENSP00000480475.1	A0A087WWS9
	PIGW	ENST00000620233.1	TSL:2	c.646C>G	p.Arg216Gly	missense	Exon 2 of 2	ENSP00000480021.1	Q7Z7B1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461844 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727212

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: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53404

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111988

Other (OTH) AF: 0.0000166 AC: 1 AN: 60394

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.87
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.52	D
Eigen	Uncertain	0.44
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.74	T
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Uncertain	-0.049	T
MutationAssessor	Pathogenic	4.0	H
PhyloP100		0.81
PrimateAI	Uncertain	0.50	T
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.97
MutPred		0.92		Loss of methylation at R216 (P = 0.0585)
MVP		0.49
ClinPred		0.98	D
GERP RS		2.3
Varity_R		0.35
gMVP		0.94
Mutation Taster		=85/15	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: rs147622852; hg19: chr17-34893596;