chr19-18155938-C-T

Position:

chr19-18155938-C-T

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBS1_SupportingBS2

The NM_005027.4(PIK3R2):c.59C>T(p.Pro20Leu) variant causes a missense change. The variant allele was found at a frequency of 0.0000522 in 1,570,702 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 (★★). Synonymous variant affecting the same amino acid position (i.e. P20P) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000054 ( 0 hom. )

Consequence

PIK3R2
NM_005027.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:1

Conservation

PhyloP100: 6.88

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:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.17757562).

BS1

Variant frequency is greater than expected in population sas. gnomad4_exome allele frequency = 0.0000543 (77/1418464) while in subpopulation SAS AF= 0.000234 (19/81038). AF 95% confidence interval is 0.000153. There are 0 homozygotes in gnomad4_exome. There are 37 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 GnomAd4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
PIK3R2	NM_005027.4 linkuse as main transcript	c.59C>T	p.Pro20Leu	missense_variant	2/16	ENST00000222254.13
PIK3R2	NR_073517.2 linkuse as main transcript	n.614C>T		non_coding_transcript_exon_variant	2/16
PIK3R2	NR_162071.1 linkuse as main transcript	n.614C>T		non_coding_transcript_exon_variant	2/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
PIK3R2	ENST00000222254.13 linkuse as main transcript	c.59C>T	p.Pro20Leu	missense_variant	2/16	1	NM_005027.4	P1
PIK3R2	ENST00000617130.5 linkuse as main transcript	c.59C>T	p.Pro20Leu	missense_variant, NMD_transcript_variant	2/15	1
PIK3R2	ENST00000426902.5 linkuse as main transcript	c.59C>T	p.Pro20Leu	missense_variant, NMD_transcript_variant	1/15	2
PIK3R2	ENST00000617642.2 linkuse as main transcript	c.59C>T	p.Pro20Leu	missense_variant, NMD_transcript_variant	2/14	5

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152238

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000723

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000285

AC:

AN:

175414

Hom.:

AF XY:

0.0000209

AC XY:

AN XY:

95628

show subpopulations

Gnomad AFR exome

AF:

0.000115

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000123

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000141

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000543

AC:

AN:

1418464

Hom.:

Cov.:

AF XY:

0.0000527

AC XY:

AN XY:

701936

show subpopulations

Gnomad4 AFR exome

AF:

0.0000618

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000806

Gnomad4 SAS exome

AF:

0.000234

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000468

Gnomad4 OTH exome

AF:

0.0000341

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152238

Hom.:

Cov.:

AF XY:

0.0000672

AC XY:

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.0000723

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000227

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 31, 2022

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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on PIK3R2 protein function. ClinVar contains an entry for this variant (Variation ID: 1015086). This variant has not been reported in the literature in individuals affected with PIK3R2-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 20 of the PIK3R2 protein (p.Pro20Leu). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.50

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.27

T;T;T

Eigen

Uncertain

0.35

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Uncertain

0.93

M_CAP

Benign

0.023

MetaRNN

Benign

0.18

T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.5

L;.;L

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.55

PROVEAN

Benign

-1.7

N;.;.

REVEL

Benign

0.13

Sift

Uncertain

0.011

D;.;.

Sift4G

Uncertain

0.011

D;D;D

Polyphen

0.89

P;.;P

Vest4

0.21

MutPred

0.27

Loss of sheet (P = 0.0104);Loss of sheet (P = 0.0104);Loss of sheet (P = 0.0104);

MVP

0.31

MPC

0.36

ClinPred

0.26

GERP RS

3.3

Varity_R

0.30

gMVP

0.41

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