1-204431759-T-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_001377334.1(PIK3C2B):c.4190A>G(p.His1397Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000137 in 1,461,880 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H1397Q) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

PIK3C2B
NM_001377334.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.47

Variant links:

Genes affected

PIK3C2B (HGNC:8972): (phosphatidylinositol-4-phosphate 3-kinase catalytic subunit type 2 beta) The protein encoded by this gene belongs to the phosphoinositide 3-kinase (PI3K) family. PI3-kinases play roles in signaling pathways involved in cell proliferation, oncogenic transformation, cell survival, cell migration, and intracellular protein trafficking. This protein contains a lipid kinase catalytic domain as well as a C-terminal C2 domain, a characteristic of class II PI3-kinases. C2 domains act as calcium-dependent phospholipid binding motifs that mediate translocation of proteins to membranes, and may also mediate protein-protein interactions. The PI3-kinase activity of this protein is sensitive to low nanomolar levels of the inhibitor wortmanin. The C2 domain of this protein was shown to bind phospholipids but not Ca2+, which suggests that this enzyme may function in a calcium-independent manner. [provided by RefSeq, Jul 2008]

PIK3C2B links:

PPP1R15B-AS1 (HGNC:55838): (PPP1R15B and PIK3C2B antisense RNA 1)

PPP1R15B-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.099122554).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
PIK3C2B	NM_001377334.1 linkuse as main transcript	c.4190A>G	p.His1397Arg	missense_variant	28/33	ENST00000684373.1
PIK3C2B	NM_002646.4 linkuse as main transcript	c.4190A>G	p.His1397Arg	missense_variant	30/35
PIK3C2B	NM_001377335.1 linkuse as main transcript	c.4106A>G	p.His1369Arg	missense_variant	31/36

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PIK3C2B	ENST00000684373.1 linkuse as main transcript	c.4190A>G	p.His1397Arg	missense_variant	28/33		NM_001377334.1	P1
PPP1R15B-AS1	ENST00000443515.1 linkuse as main transcript	n.147-3578T>C		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251494

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135922

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000137

AC:

AN:

1461880

Hom.:

Cov.:

AF XY:

0.0000179

AC XY:

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000171

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

Alfa

AF:

0.000111

Hom.:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 08, 2022

The c.4190A>G (p.H1397R) alteration is located in exon 29 (coding exon 27) of the PIK3C2B gene. This alteration results from a A to G substitution at nucleotide position 4190, causing the histidine (H) at amino acid position 1397 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.059

BayesDel_addAF

Benign

-0.27

BayesDel_noAF

Benign

-0.54

Cadd

Benign

Dann

Benign

0.86

DEOGEN2

Benign

0.038

T;.

Eigen

Benign

-0.71

Eigen_PC

Benign

-0.49

FATHMM_MKL

Benign

0.37

LIST_S2

Benign

0.59

T;T

M_CAP

Benign

0.0064

MetaRNN

Benign

0.099

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.20

N;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.43

PROVEAN

Benign

-0.32

N;N

REVEL

Benign

0.13

Sift

Benign

0.53

T;T

Sift4G

Benign

0.52

T;T

Polyphen

0.0010

B;B

Vest4

0.24

MutPred

0.46

Gain of MoRF binding (P = 0.0183);.;

MVP

0.33

MPC

0.37

ClinPred

0.029

GERP RS

4.7

Varity_R

0.039

gMVP

0.15

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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