4-530729-C-T

Position:

• chr4-530729-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001127178.3(PIGG):​c.2555C>T​(p.Ala852Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000688 in 1,454,444 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000069 (0 hom.)
• Consequence: PIGG NM_001127178.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.13

Genes affected

PIGG (HGNC:25985): (phosphatidylinositol glycan anchor biosynthesis class G (EMM blood group)) This gene encodes an enzyme involved in glycosylphosphatidylinositol-anchor biosynthesis. The encoded protein, which is localized to the endoplasmic reticulum, is involved in transferring ethanoloamine phosphate to mannose 2 of glycosylphosphatidylinositol species H7 to form species H8. Allelic variants of this gene have been associated with intellectual disability, hypotonia, and early-onset seizures. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PIGG	NM_001127178.3	c.2555C>T	p.Ala852Val	missense_variant	11/13	ENST00000453061.7	NP_001120650.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PIGG	ENST00000453061.7	c.2555C>T	p.Ala852Val	missense_variant	11/13	1	NM_001127178.3	ENSP00000415203.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000688 AC: 10 AN: 1454444 Hom.: 0 Cov.: 29 AF XY: 0.00000830 AC XY: 6 AN XY: 722904

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000253

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000814

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.45
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Benign	-0.090
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.013	.;T;T;.
Eigen	Pathogenic	0.72
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D;D;D
M_CAP	Benign	0.0090	T
MetaRNN	Uncertain	0.68	D;D;D;D
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.2	.;M;.;.
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-1.8	N;N;N;N
REVEL	Benign	0.18
Sift	Benign	0.20	T;T;T;T
Sift4G	Benign	0.78	T;T;T;T
Polyphen		1.0	D;D;.;D
Vest4		0.84
MutPred		0.42		.;Loss of helix (P = 0.0626);.;.;
MVP		0.43
MPC		0.69
ClinPred		0.89	D
GERP RS		5.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.23
gMVP		0.74

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs749071064; hg19: chr4-524518;