1-204429987-C-G

Position:

chr1-204429987-C-G

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_001377334.1(PIK3C2B):c.4332G>C(p.Glu1444Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000738 in 1,612,042 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 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. E1444K) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000077 ( 0 hom. )

Consequence

PIK3C2B
NM_001377334.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.526

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 -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.1613526).

BS2

High AC in GnomAd4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
PIK3C2B	NM_001377334.1 linkuse as main transcript	c.4332G>C	p.Glu1444Asp	missense_variant	29/33	ENST00000684373.1
PIK3C2B	NM_002646.4 linkuse as main transcript	c.4332G>C	p.Glu1444Asp	missense_variant	31/35
PIK3C2B	NM_001377335.1 linkuse as main transcript	c.4248G>C	p.Glu1416Asp	missense_variant	32/36

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PIK3C2B	ENST00000684373.1 linkuse as main transcript	c.4332G>C	p.Glu1444Asp	missense_variant	29/33		NM_001377334.1	P1
PPP1R15B-AS1	ENST00000443515.1 linkuse as main transcript	n.147-5350C>G		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152268

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000523

AC:

AN:

248778

Hom.:

AF XY:

0.0000668

AC XY:

AN XY:

134756

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000290

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:

0.000106

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000774

AC:

113

AN:

1459774

Hom.:

Cov.:

AF XY:

0.0000716

AC XY:

AN XY:

726256

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:

0.0000998

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152268

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74396

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000416

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.000178

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

Oct 06, 2021

The c.4332G>C (p.E1444D) alteration is located in exon 30 (coding exon 28) of the PIK3C2B gene. This alteration results from a G to C substitution at nucleotide position 4332, causing the glutamic acid (E) at amino acid position 1444 to be replaced by an aspartic acid (D). 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

0.12

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.55

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.083

T;.

Eigen

Benign

-0.54

Eigen_PC

Benign

-0.38

FATHMM_MKL

Benign

0.74

LIST_S2

Benign

0.70

T;T

M_CAP

Benign

0.012

MetaRNN

Benign

0.16

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.3

L;.

MutationTaster

Benign

0.83

N;N

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-1.4

N;N

REVEL

Benign

0.057

Sift

Benign

0.29

T;T

Sift4G

Benign

0.57

T;T

Polyphen

0.015

B;B

Vest4

0.32

MutPred

0.54

Loss of helix (P = 0.0041);.;

MVP

0.39

MPC

0.29

ClinPred

0.057

GERP RS

2.5

Varity_R

0.11

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