3-179218305-G-T

Variant summary

Our verdict is Pathogenic. Variant got 20 ACMG points: 20P and 0B. PS1 PM1 PM2 PM5 PP2 PP3 PP5_Very_Strong

The NM_006218.4(PIK3CA):c.1635G>T(p.Glu545Asp) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E545G) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PIK3CA NM_006218.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:29
• Conservation: PhyloP100: 4.04

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]

ACMG classification

Verdict is Pathogenic. Variant got 20 ACMG points.

• PS1: Transcript NM_006218.4 (PIK3CA) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 376245
• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_006218.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-179218303-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 13655.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant where missense usually causes diseases, PIK3CA
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.76
• PP5: Variant 3-179218305-G-T is Pathogenic according to our data. Variant chr3-179218305-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 217293.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PIK3CA	NM_006218.4	c.1635G>T	p.Glu545Asp	missense_variant	10/21	ENST00000263967.4
PIK3CA	XM_006713658.5	c.1635G>T	p.Glu545Asp	missense_variant	10/21

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PIK3CA	ENST00000263967.4	c.1635G>T	p.Glu545Asp	missense_variant	10/21	2	NM_006218.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:29

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Megalencephaly-capillary malformation-polymicrogyria syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	MGZ Medical Genetics Center	Jun 24, 2022	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	3billion	Oct 02, 2021	Same nucleotide change resulting in same amino acid change has been previously reported as pathogenic (ClinVar ID: VCV000217293.1, PMID:27631024, 32778138, PS1). The missense variant is located in a mutational hot spot and/or well-established functional domain in which established pathogenic variants have been reported (PM1). It is not observed in the gnomAD v2.1.1 dataset (PM2). A different missense change at the same codon (p.Glu545Lys) has been reported as pathogenic (VCV000013655.18 PM5). The variant was observed as assumed (i.e. paternity and maternity not confirmed) de novoo (3billion dataset, PM6). Patient’s phenotype is considered as compatible with Megalencephaly-capillary malformation-polymicrogyria syndrome (PP4_P).Therefore, this variant is classified as likley pathogenic according to the recommendation of ACMG/AMP guideline. -

Glioblastoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Prostate adenocarcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Carcinoma of esophagus Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Gastric adenocarcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Squamous cell lung carcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Breast neoplasm Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Cowden syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

May 21, 2022

Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 217293). This missense change has been observed in individual(s) with PIK3CA-related overgrowth spectrum (PMID: 27631024, 32778138). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with aspartic acid, which is acidic and polar, at codon 545 of the PIK3CA protein (p.Glu545Asp). -

Brainstem glioma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Nasopharyngeal neoplasm Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Neoplasm of brain Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Hepatocellular carcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Neoplasm of the large intestine Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Small cell lung carcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Papillary renal cell carcinoma, sporadic Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Capillary malformation Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Seattle Children's Hospital Molecular Genetics Laboratory, Seattle Children's Hospital

-

- -

Papillary renal cell carcinoma type 1 Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Ovarian serous cystadenocarcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Malignant melanoma of skin Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Uterine carcinosarcoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

PIK3CA related overgrowth syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Clinical Genomics Laboratory, Washington University in St. Louis

Oct 17, 2014

- -

Malignant neoplasm of body of uterus Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Pancreatic adenocarcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Gallbladder carcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Lung adenocarcinoma Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Transitional cell carcinoma of the bladder Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Neoplasm of uterine cervix Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Squamous cell carcinoma of the head and neck Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.87
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.070
Cadd	Benign	22
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.89	D;.
Eigen	Uncertain	0.29
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.043	D
MetaRNN	Pathogenic	0.76	D;D
MetaSVM	Benign	-0.76	T
MutationAssessor	Benign	1.6	L;.
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	-2.0	N;.
REVEL	Uncertain	0.36
Sift	Benign	0.043	D;.
Sift4G	Benign	0.13	T;.
Polyphen		1.0	D;.
Vest4		0.89
MutPred		0.77		Loss of ubiquitination at K548 (P = 0.1306);Loss of ubiquitination at K548 (P = 0.1306);
MVP		0.79
MPC		2.6
ClinPred		0.87	D
GERP RS		2.7
Varity_R		0.72
gMVP		0.80

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

Other links and lift over

dbSNP: rs121913275; hg19: chr3-178936093; COSMIC: COSV55874040; COSMIC: COSV55874040;