4-530673-G-C

Variant names:

• chr4-530673-G-C
• rs1056486559
• NM_001127178.3:c.2499G>C

Variant summary

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

The NM_001127178.3(PIGG):​c.2499G>C​(p.Lys833Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,444 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 (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: PIGG NM_001127178.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 2.83
• Publications: 0 publications found

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]

PIGG Gene-Disease associations (from GenCC):

• intellectual disability, autosomal recessive 53

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

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=0.18715855).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001127178.3. 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
	PIGG	NM_001127178.3	MANE Select	c.2499G>C	p.Lys833Asn	missense	Exon 11 of 13	NP_001120650.1	Q5H8A4-1
	PIGG	NM_017733.5		c.2475G>C	p.Lys825Asn	missense	Exon 11 of 13	NP_060203.3
	PIGG	NM_001289051.2		c.2232G>C	p.Lys744Asn	missense	Exon 11 of 13	NP_001275980.1	E7EWV1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIGG	ENST00000453061.7	TSL:1 MANE Select	c.2499G>C	p.Lys833Asn	missense	Exon 11 of 13	ENSP00000415203.2	Q5H8A4-1
	PIGG	ENST00000383028.8	TSL:1	c.2100G>C	p.Lys700Asn	missense	Exon 9 of 11	ENSP00000372494.4	Q5H8A4-3
	PIGG	ENST00000310340.9	TSL:2	c.2475G>C	p.Lys825Asn	missense	Exon 11 of 13	ENSP00000311750.5	Q5H8A4-2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000119 AC: 3 AN: 251472 AF XY: 0.00000736

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461444 Hom.: 0 Cov.: 30 AF XY: 0.00000688 AC XY: 5 AN XY: 727076

African (AFR) AF: 0.00 AC: 0 AN: 33468

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

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39692

South Asian (SAS) AF: 0.0000696 AC: 6 AN: 86248

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

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

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111620

Other (OTH) AF: 0.0000331 AC: 2 AN: 60376

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Intellectual disability, autosomal recessive 53 (2)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.42
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	19
DANN	Uncertain	1.0
DEOGEN2	Benign	0.0086	T
Eigen	Benign	-0.090
Eigen_PC	Benign	0.13
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.77	T
M_CAP	Benign	0.0030	T
MetaRNN	Benign	0.19	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.1	M
PhyloP100		2.8
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.7	N
REVEL	Benign	0.060
Sift	Benign	0.067	T
Sift4G	Benign	0.64	T
Polyphen		0.0010	B
Vest4		0.34
MutPred		0.45		Loss of methylation at K833 (P = 0.0103)
MVP		0.20
MPC		0.21
ClinPred		0.26	T
GERP RS		5.9
Varity_R		0.19
gMVP		0.72
Mutation Taster		=57/43	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: rs1056486559; hg19: chr4-524462;