20-45416168-T-C

Variant names:

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_015937.6(PIGT):c.12T>C(p.Ala4Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000291 in 1,568,838 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0016 ( 3 hom., cov: 33)

Exomes 𝑓: 0.00015 ( 3 hom. )

Consequence

PIGT
NM_015937.6 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: -5.20

Variant links:

Genes affected

PIGT (HGNC:14938): (phosphatidylinositol glycan anchor biosynthesis class T) This gene encodes a protein 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 an essential component of the multisubunit enzyme, GPI transamidase. GPI transamidase mediates GPI anchoring in the endoplasmic reticulum, by catalyzing the transfer of fully assembled GPI units to proteins. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, May 2012]

PIGT links:

LOC107985405 (HGNC:):

LOC107985405 links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.78).

BP6

Variant 20-45416168-T-C is Benign according to our data. Variant chr20-45416168-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 741217.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-5.2 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00159 (242/152368) while in subpopulation AFR AF= 0.00563 (234/41600). AF 95% confidence interval is 0.00503. There are 3 homozygotes in gnomad4. There are 117 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PIGT	NM_015937.6 link	c.12T>C	p.Ala4Ala	synonymous_variant	Exon 1 of 12	ENST00000279036.12	NP_057021.2	Q969N2-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PIGT	ENST00000279036.12 link	c.12T>C	p.Ala4Ala	synonymous_variant	Exon 1 of 12	1	NM_015937.6	ENSP00000279036.6		Q969N2-1

Frequencies

GnomAD3 genomes

AF:

0.00160

AC:

243

AN:

152250

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00567

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

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:

0.0000147

Gnomad OTH

AF:

0.000956

GnomAD3 exomes

AF:

0.000317

AC:

AN:

176830

Hom.:

AF XY:

0.000301

AC XY:

AN XY:

96258

show subpopulations

Gnomad AFR exome

AF:

0.00509

Gnomad AMR exome

AF:

0.000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000402

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000214

GnomAD4 exome

AF:

0.000151

AC:

214

AN:

1416470

Hom.:

Cov.:

AF XY:

0.000130

AC XY:

AN XY:

701156

show subpopulations

Gnomad4 AFR exome

AF:

0.00494

Gnomad4 AMR exome

AF:

0.000417

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000123

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000550

Gnomad4 OTH exome

AF:

0.000529

GnomAD4 genome

AF:

0.00159

AC:

242

AN:

152368

Hom.:

Cov.:

AF XY:

0.00157

AC XY:

117

AN XY:

74510

show subpopulations

Gnomad4 AFR

AF:

0.00562

Gnomad4 AMR

AF:

0.000327

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000946

Alfa

AF:

0.000402

Hom.:

Bravo

AF:

0.00156

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

PIGT-related disorder

Benign:1

Sep 17, 2019

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Multiple congenital anomalies-hypotonia-seizures syndrome 3

Benign:1

Jan 25, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Benign:1

Jun 04, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.78

CADD

Benign

1.1

DANN

Benign

0.66

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over