Genetic Variant PIGG:p.Val242Leu (chr4-507558-G-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001127178.3(PIGG):c.724G>T(p.Val242Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,644 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. 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. V242M) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

PIGG
NM_001127178.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.326

Publications

0 publications found

Variant links:

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)

PIGG links:

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ACMG classification

Classification was made for transcript

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=0.16991156).

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

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
PIGG	NM_001127178.3	MANE Select	c.724G>T	p.Val242Leu	missense	Exon 4 of 13	NP_001120650.1
PIGG	NM_001345988.2		c.-164G>T		5_prime_UTR_premature_start_codon_gain	Exon 4 of 12	NP_001332917.1
PIGG	NM_001345994.2		c.-489G>T		5_prime_UTR_premature_start_codon_gain	Exon 4 of 14	NP_001332923.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
PIGG	ENST00000453061.7	TSL:1 MANE Select	c.724G>T	p.Val242Leu	missense	Exon 4 of 13	ENSP00000415203.2
PIGG	ENST00000509768.1	TSL:1	c.457G>T	p.Val153Leu	missense	Exon 4 of 8	ENSP00000421550.1
PIGG	ENST00000506402.5	TSL:1	n.724G>T		non_coding_transcript_exon	Exon 4 of 9	ENSP00000424619.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461644

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727120

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33468

American (AMR)

AF:

0.00

AC:

AN:

44704

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86224

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53416

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5662

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111958

Other (OTH)

AF:

0.00

AC:

AN:

60378

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.48

CADD

Benign

8.7

(source)

DANN

Benign

0.94

DEOGEN2

Benign

0.027

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.20

LIST_S2

Uncertain

0.95

M_CAP

Benign

0.019

MetaRNN

Benign

0.17

MetaSVM

Benign

-0.89

MutationAssessor

Benign

2.0

PhyloP100

-0.33

PrimateAI

Benign

0.32

PROVEAN

Benign

-1.7

REVEL

Benign

0.075

Sift

Uncertain

0.014

Sift4G

Uncertain

0.030

Polyphen

0.12

Vest4

0.35

MutPred

0.63

Gain of ubiquitination at K245 (P = 0.0599)

MVP

0.18

MPC

0.47

ClinPred

0.42

GERP RS

-5.1

Varity_R

0.20

gMVP

0.65

Mutation Taster

=83/17

polymorphism

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over