rs201186795

Variant names:

• chr4-523706-C-T
• rs201186795
• NM_001127178.3:c.1862C>T

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_001127178.3(PIGG):​c.1862C>T​(p.Ala621Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000259 in 1,614,044 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. A621A) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000099 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00028 (0 hom.)
• Consequence: PIGG NM_001127178.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: -0.597
• Publications: 6 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: Ambry Genetics, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.06062296).

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.1862C>T	p.Ala621Val	missense	Exon 9 of 13	NP_001120650.1
	PIGG	NM_017733.5		c.1838C>T	p.Ala613Val	missense	Exon 9 of 13	NP_060203.3
	PIGG	NM_001289051.2		c.1595C>T	p.Ala532Val	missense	Exon 9 of 13	NP_001275980.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIGG	ENST00000453061.7	TSL:1 MANE Select	c.1862C>T	p.Ala621Val	missense	Exon 9 of 13	ENSP00000415203.2
	PIGG	ENST00000383028.8	TSL:1	c.1463C>T	p.Ala488Val	missense	Exon 7 of 11	ENSP00000372494.4
	PIGG	ENST00000310340.9	TSL:2	c.1838C>T	p.Ala613Val	missense	Exon 9 of 13	ENSP00000311750.5

Frequencies

GnomAD3 genomes AF: 0.0000986 AC: 15 AN: 152206 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000482

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

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: 0.000162

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000195 AC: 49 AN: 251144 AF XY: 0.000236

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000867

Gnomad ASJ exome AF: 0.0000993

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000388

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000276 AC: 403 AN: 1461838 Hom.: 0 Cov.: 33 AF XY: 0.000264 AC XY: 192 AN XY: 727226

African (AFR) AF: 0.0000597 AC: 2 AN: 33480

American (AMR) AF: 0.0000894 AC: 4 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.000115 AC: 3 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

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

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53382

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

European-Non Finnish (NFE) AF: 0.000339 AC: 377 AN: 1111996

Other (OTH) AF: 0.000265 AC: 16 AN: 60396

GnomAD4 genome AF: 0.0000986 AC: 15 AN: 152206 Hom.: 0 Cov.: 33 AF XY: 0.0000807 AC XY: 6 AN XY: 74366

African (AFR) AF: 0.0000482 AC: 2 AN: 41454

American (AMR) AF: 0.000131 AC: 2 AN: 15290

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

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

European-Non Finnish (NFE) AF: 0.000162 AC: 11 AN: 68038

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.000221 Hom.: 1

Bravo AF: 0.000128

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.000259 AC: 1

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.000255 AC: 31

EpiCase AF: 0.000436

EpiControl AF: 0.000356

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Inborn genetic diseases (1)
-	1	-	Intellectual disability, autosomal recessive 53 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.077
BayesDel_addAF	Benign	-0.56	T
BayesDel_noAF	Benign	-0.72
CADD	Benign	4.8
DANN	Benign	0.66
DEOGEN2	Benign	0.011	T
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.15	N
LIST_S2	Benign	0.58	T
M_CAP	Benign	0.0021	T
MetaRNN	Benign	0.061	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.4	L
PhyloP100		-0.60
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.77	N
REVEL	Benign	0.092
Sift	Benign	0.18	T
Sift4G	Benign	0.15	T
Polyphen		0.069	B
Vest4		0.14
MVP		0.42
MPC		0.17
ClinPred		0.023	T
GERP RS		-0.096
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.026
gMVP		0.24
Mutation Taster		=95/5	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: rs201186795; hg19: chr4-517495; COSMIC: COSV56321190; COSMIC: COSV56321190;