chr20-45416164-C-G

Variant names:

• chr20-45416164-C-G
• rs764788407
• NM_015937.6:c.8C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_015937.6(PIGT):​c.8C>G​(p.Ala3Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign 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. A3V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: PIGT NM_015937.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0630
• Publications: 0 publications found

Genes affected

PIGT (HGNC:14938): (phosphatidylinositol glycan anchor biosynthesis class T) 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 an essential component of the multisubunit enzyme, GPI transamidase. GPI transamidase mediates GPI anchoring in the endoplasmic reticulum, by catalyzing the transfer of fully assembled GPI units to proteins. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, May 2012]

PIGT Gene-Disease associations (from GenCC):

• multiple congenital anomalies-hypotonia-seizures syndrome 3

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), G2P

LOC107985405 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13674021).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015937.6. 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
	PIGT	NM_015937.6	MANE Select	c.8C>G	p.Ala3Gly	missense	Exon 1 of 12	NP_057021.2
	PIGT	NM_001184728.3		c.8C>G	p.Ala3Gly	missense	Exon 1 of 11	NP_001171657.1	Q969N2-5
	PIGT	NM_001184729.3		c.8C>G	p.Ala3Gly	missense	Exon 1 of 11	NP_001171658.1	Q969N2-6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIGT	ENST00000279036.12	TSL:1 MANE Select	c.8C>G	p.Ala3Gly	missense	Exon 1 of 12	ENSP00000279036.6	Q969N2-1
	PIGT	ENST00000372689.9	TSL:1	c.8C>G	p.Ala3Gly	missense	Exon 1 of 11	ENSP00000361774.4	Q969N2-6
	PIGT	ENST00000639382.1	TSL:1	c.8C>G	p.Ala3Gly	missense	Exon 1 of 9	ENSP00000491534.1	A0A1W2PPQ7

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.017	T
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.26
FATHMM_MKL	Benign	0.60	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.14	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.34	N
PhyloP100		0.063
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-0.96	N
REVEL	Benign	0.067
Sift	Benign	0.19	T
Sift4G	Benign	0.11	T
Polyphen		0.0010	B
Vest4		0.33
MutPred		0.27		Loss of helix (P = 0.0444)
MVP		0.47
MPC		0.12
ClinPred		0.64	D
GERP RS		2.5
PromoterAI		-0.46	Neutral
Varity_R		0.090
gMVP		0.59
Mutation Taster		=83/17	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs764788407; hg19: chr20-44044804;