1-77154594-C-T

Variant names:

• chr1-77154594-C-T
• rs776294990
• NM_005482.3:c.841G>A

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_005482.3(PIGK):​c.841G>A​(p.Val281Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000031 in 1,612,312 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V281L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: PIGK NM_005482.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.47
• Publications: 1 publications found

Genes affected

PIGK (HGNC:8965): (phosphatidylinositol glycan anchor biosynthesis class K) This gene encodes a member of the cysteine protease family C13 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 a member of the multisubunit enzyme, GPI transamidase and is thought to be its enzymatic component. GPI transamidase mediates GPI anchoring in the endoplasmic reticulum, by catalyzing the transfer of fully assembled GPI units to proteins. [provided by RefSeq, Jul 2008]

PIGK Gene-Disease associations (from GenCC):

• neurodevelopmental disorder with hypotonia and cerebellar atrophy, with or without seizures

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.33396).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005482.3. 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
	PIGK	NM_005482.3	MANE Select	c.841G>A	p.Val281Met	missense	Exon 9 of 11	NP_005473.1	Q92643-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIGK	ENST00000370812.8	TSL:1 MANE Select	c.841G>A	p.Val281Met	missense	Exon 9 of 11	ENSP00000359848.3	Q92643-1
	PIGK	ENST00000359130.1	TSL:1	c.841G>A	p.Val281Met	missense	Exon 9 of 9	ENSP00000352041.1	A6NEM5
	PIGK	ENST00000445065.5	TSL:1	c.559G>A	p.Val187Met	missense	Exon 6 of 8	ENSP00000388854.1	B1AK81

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152106 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000656

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: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000160 AC: 4 AN: 250134 AF XY: 0.0000148

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000117

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1460206 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 726450

African (AFR) AF: 0.00 AC: 0 AN: 33426

American (AMR) AF: 0.0000897 AC: 4 AN: 44582

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26108

East Asian (EAS) AF: 0.00 AC: 0 AN: 39646

South Asian (SAS) AF: 0.00 AC: 0 AN: 86128

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53390

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5748

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1110860

Other (OTH) AF: 0.00 AC: 0 AN: 60318

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152106 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74300

African (AFR) AF: 0.00 AC: 0 AN: 41430

American (AMR) AF: 0.0000656 AC: 1 AN: 15248

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5202

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10606

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68010

Other (OTH) AF: 0.00 AC: 0 AN: 2088

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.0000165 AC: 2

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.21
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0065	T
Eigen	Benign	-0.13
Eigen_PC	Benign	0.13
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.91	D
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.33	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	-0.26	N
PhyloP100		7.5
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	-0.57	N
REVEL	Benign	0.25
Sift	Benign	0.25	T
Sift4G	Benign	0.24	T
Polyphen		0.0060	B
Vest4		0.73
MutPred		0.37		Loss of sheet (P = 0.0817)
MVP		0.24
MPC		0.25
ClinPred		0.42	T
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.19
gMVP		0.58
Mutation Taster		=73/27	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs776294990; hg19: chr1-77620279;