rs181194055

Variant names:

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 1P and 8B. BA1PP2

This summary comes from the ClinGen Evidence Repository: The c.2198A>G (NM_006218.4) variant in PIK3CA is a missense variant predicted to cause substitution of (p.Lys733Arg). The highest population minor allele frequency in gnomAD v2.1.1 is 0.005643 in the East Asian population, which is higher than the ClinGen BMEP threshold ([>=0.00185]) for BA1, and therefore meets this criterion (BA1). PIK3CA, in which the variant was identified, is defined by the ClinGen Brain Malformations Expert Panel as a gene that has a low rate of benign missense variation and where pathogenic missense variants are a common mechanism of disease (PP2). In summary, this variant meets the criteria to be classified as Benign for mosaic autosomal dominant overgrowth with or without cerebral malformations due to abnormalities in MTOR-pathway genes based on the ACMG/AMP criteria applied, as specified by the ClinGen Brain Malformations Expert Panel: BA1, PP2; -7 points (VCEP specifications version 1; Approved: 1/31/2021) LINK:https://erepo.genome.network/evrepo/ui/classification/CA2710903/MONDO:0016054/018

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000083 ( 2 hom. )

Consequence

PIK3CA
NM_006218.4 missense

Scores

Clinical Significance

Benign reviewed by expert panel B:2

Conservation

PhyloP100: 4.06

Publications

11 publications found

Variant links:

Genes affected

PIK3CA (HGNC:8975): (phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha) Phosphatidylinositol 3-kinase is composed of an 85 kDa regulatory subunit and a 110 kDa catalytic subunit. The protein encoded by this gene represents the catalytic subunit, which uses ATP to phosphorylate PtdIns, PtdIns4P and PtdIns(4,5)P2. This gene has been found to be oncogenic and has been implicated in cervical cancers. A pseudogene of this gene has been defined on chromosome 22. [provided by RefSeq, Apr 2016]

PIK3CA Gene-Disease associations (from GenCC):

overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
megalencephaly-capillary malformation-polymicrogyria syndrome
Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
vascular malformation
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
Cowden disease
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Cowden syndrome 5
Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
familial ovarian cancer
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
hereditary breast carcinoma
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

PIK3CA links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

PP2

For more information check the summary or visit ClinGen Evidence Repository.

BA1

For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006218.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIK3CA	NM_006218.4	MANE Select	c.2198A>G	p.Lys733Arg	missense	Exon 15 of 21	NP_006209.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
PIK3CA	ENST00000263967.4	TSL:2 MANE Select	c.2198A>G	p.Lys733Arg	missense	Exon 15 of 21	ENSP00000263967.3
PIK3CA	ENST00000955190.1		c.2228A>G	p.Lys743Arg	missense	Exon 15 of 21	ENSP00000625249.1
PIK3CA	ENST00000876545.1		c.2198A>G	p.Lys733Arg	missense	Exon 16 of 22	ENSP00000546604.1

Frequencies

GnomAD3 genomes

AF:

0.000158

AC:

AN:

151932

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:

0.00463

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000442

AC:

110

AN:

248592

AF XY:

0.000356

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000582

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00574

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000166

GnomAD4 exome

AF:

0.0000828

AC:

119

AN:

1436926

Hom.:

Cov.:

AF XY:

0.0000671

AC XY:

AN XY:

715688

show subpopulations

African (AFR)

AF:

0.0000303

AC:

AN:

32952

American (AMR)

AF:

0.0000449

AC:

AN:

44574

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25890

East Asian (EAS)

AF:

0.00230

AC:

AN:

39484

South Asian (SAS)

AF:

0.0000585

AC:

AN:

85406

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53172

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5686

European-Non Finnish (NFE)

AF:

9.17e-7

AC:

AN:

1090328

Other (OTH)

AF:

0.000320

AC:

AN:

59434

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000158

AC:

AN:

152050

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74298

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41480

American (AMR)

AF:

0.00

AC:

AN:

15248

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00465

AC:

AN:

5166

South Asian (SAS)

AF:

0.00

AC:

AN:

4812

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10592

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67966

Other (OTH)

AF:

0.00

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000438

Hom.:

Bravo

AF:

0.000174

ExAC

AF:

0.000447

AC:

ClinVar

ClinVar submissions as Germline

Significance:Benign

Revision:reviewed by expert panel

View on ClinVar

Pathogenic

VUS

Benign

Condition

Cowden syndrome (1)

Overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.076

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.26

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.41

Eigen

Benign

0.068

Eigen_PC

Uncertain

0.26

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.93

M_CAP

Benign

0.016

MetaRNN

Benign

0.0094

MetaSVM

Benign

-0.44

MutationAssessor

Benign

1.7

PhyloP100

4.1

PrimateAI

Uncertain

0.76

PROVEAN

Benign

-1.1

REVEL

Benign

0.27

Sift

Benign

0.045

Sift4G

Benign

0.20

Polyphen

0.0020

Vest4

0.17

MVP

0.73

MPC

1.2

ClinPred

0.023

GERP RS

6.0

Varity_R

0.32

gMVP

0.37

Mutation Taster

=87/13

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over