19-18155935-G-A

Position:

chr19-18155935-G-A

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBS1_SupportingBS2

The NM_005027.4(PIK3R2):c.56G>A(p.Arg19Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000172 in 1,570,076 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: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000018 ( 0 hom. )

Consequence

PIK3R2
NM_005027.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.12

Variant links:

Genes affected

PIK3R2 (HGNC:8980): (phosphoinositide-3-kinase regulatory subunit 2) Phosphatidylinositol 3-kinase (PI3K) is a lipid kinase that phosphorylates phosphatidylinositol and similar compounds, creating second messengers important in growth signaling pathways. PI3K functions as a heterodimer of a regulatory and a catalytic subunit. The protein encoded by this gene is a regulatory component of PI3K. Three transcript variants, one protein coding and the other two non-protein coding, have been found for this gene. [provided by RefSeq, Apr 2019]

PIK3R2 links:

ENSG00000268173 (HGNC:):

ENSG00000268173 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.015589118).

BS1

Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.0000176 (25/1417816) while in subpopulation MID AF= 0.00035 (2/5710). AF 95% confidence interval is 0.0000674. There are 0 homozygotes in gnomad4_exome. There are 14 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAdExome4 at 25 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PIK3R2	NM_005027.4 linkuse as main transcript	c.56G>A	p.Arg19Gln	missense_variant	2/16	ENST00000222254.13	NP_005018.2	O00459
PIK3R2	NR_073517.2 linkuse as main transcript	n.611G>A		non_coding_transcript_exon_variant	2/16
PIK3R2	NR_162071.1 linkuse as main transcript	n.611G>A		non_coding_transcript_exon_variant	2/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PIK3R2	ENST00000222254.13 linkuse as main transcript	c.56G>A	p.Arg19Gln	missense_variant	2/16	1	NM_005027.4	ENSP00000222254.6		O00459
ENSG00000268173	ENST00000593731.1 linkuse as main transcript	n.56G>A		non_coding_transcript_exon_variant	2/25	2		ENSP00000471914.1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152260

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.00

GnomAD3 exomes

AF:

0.0000401

AC:

AN:

174512

Hom.:

AF XY:

0.0000210

AC XY:

AN XY:

95072

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000218

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000409

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000176

AC:

AN:

1417816

Hom.:

Cov.:

AF XY:

0.0000200

AC XY:

AN XY:

701572

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000155

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000269

Gnomad4 SAS exome

AF:

0.0000247

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000119

Gnomad4 OTH exome

AF:

0.0000170

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152260

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74390

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

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:

0.00

Alfa

AF:

0.0000283

Hom.:

Bravo

AF:

0.0000340

ExAC

AF:

0.0000522

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 09, 2023

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt PIK3R2 protein function. ClinVar contains an entry for this variant (Variation ID: 1037102). This variant has not been reported in the literature in individuals affected with PIK3R2-related conditions. This variant is present in population databases (rs754693011, gnomAD 0.02%). This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 19 of the PIK3R2 protein (p.Arg19Gln). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.45

BayesDel_noAF

Benign

-0.60

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.24

T;T;T

Eigen

Benign

0.0084

Eigen_PC

Benign

0.17

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.84

.;T;.

M_CAP

Benign

0.012

MetaRNN

Benign

0.016

T;T;T

MetaSVM

Benign

-0.99

MutationAssessor

Benign

-0.030

N;.;N

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-0.81

N;.;.

REVEL

Benign

0.046

Sift

Benign

0.094

T;.;.

Sift4G

Benign

0.15

T;T;T

Polyphen

0.25

B;.;B

Vest4

0.11

MutPred

0.28

Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);

MVP

0.33

MPC

0.36

ClinPred

0.13

GERP RS

4.5

Varity_R

0.64

gMVP

0.30

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