chr3-179234286-G-A
Position:
Variant summary
Our verdict is Pathogenic. Variant got 23 ACMG points: 23P and 0B. PS1_Very_StrongPM1PM2PM5PP2PP5_Very_Strong
The NM_006218.4(PIK3CA):c.3129G>A(p.Met1043Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Pathogenicin ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M1043L) has been classified as Likely pathogenic.
Frequency
Genomes: not found (cov: 32)
Consequence
PIK3CA
NM_006218.4 missense
NM_006218.4 missense
Scores
5
5
9
Clinical Significance
Conservation
PhyloP100: 9.49
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]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 23 ACMG points.
PS1
Transcript NM_006218.4 (PIK3CA) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 217292
PM1
In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 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 chr3-179234284-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1333708.Status of the report is criteria_provided_single_submitter, 1 stars.
PP2
Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PIK3CA. . Gene score misZ 5.5986 (greater than the threshold 3.09). Trascript score misZ 6.1406 (greater than threshold 3.09). GenCC has associacion of gene with hereditary breast carcinoma, vascular malformation, Cowden disease, Cowden syndrome 5, CLOVES syndrome, familial ovarian cancer, megalencephaly-capillary malformation-polymicrogyria syndrome, overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes.
PP5
Variant 3-179234286-G-A is Pathogenic according to our data. Variant chr3-179234286-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 179173.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.3129G>A | p.Met1043Ile | missense_variant | 21/21 | ENST00000263967.4 | |
| PIK3CA | XM_006713658.5 | c.3129G>A | p.Met1043Ile | missense_variant | 21/21 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|
| PIK3CA | ENST00000263967.4 | c.3129G>A | p.Met1043Ile | missense_variant | 21/21 | 2 | NM_006218.4 | P1 |
Frequencies
GnomAD3 genomes
GnomAD3 genomes
Cov.:
32
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:16
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Glioblastoma 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 | - - |
Breast neoplasm Pathogenic:1
| Likely pathogenic, no assertion criteria provided | literature only | Database of Curated Mutations (DoCM) | May 31, 2016 | - - |
not provided Pathogenic:1
| Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Oct 20, 2022 | Identified in patients with features of PIK3CA-related overgrowth and brain malformations spectrum disorder referred for genetic testing at GeneDx and in the published literature (Kuentz et al., 2017); In silico analysis supports that this missense variant does not alter protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 33745098, 31831300, 22120714, 15930273, 26627007, 28151489) - |
Cowden syndrome Pathogenic:1
| Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jul 05, 2022 | For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change affects PIK3CA function (PMID: 15930273, 17376864, 22120714). 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) performed at Invitae indicates that this missense variant is expected to disrupt PIK3CA protein function. ClinVar contains an entry for this variant (Variation ID: 179173). This missense change has been observed in individual(s) with hemimegalencephaly (PMID: 28151489). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces methionine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 1043 of the PIK3CA protein (p.Met1043Ile). - |
Megalencephaly-capillary malformation-polymicrogyria syndrome Pathogenic:1
| Pathogenic, criteria provided, single submitter | research | Equipe Genetique des Anomalies du Developpement, Université de Bourgogne | - | - - |
PIK3CA related overgrowth syndrome Pathogenic:1
| Pathogenic, no assertion criteria provided | clinical testing | Clinical Genomics Laboratory, Washington University in St. Louis | Jan 20, 2015 | - - |
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 | - - |
Neoplasm of brain Pathogenic:1
| Likely pathogenic, no assertion criteria provided | literature only | Database of Curated Mutations (DoCM) | May 31, 2016 | - - |
Non-small cell lung carcinoma Pathogenic:1
| Likely pathogenic, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Jul 19, 2013 | The Met1043Ile variant has been identified as a somatic change in tumors from mulitple tissues, including endometrium, lung, cervix, urinary tract and large intestine (COSMIC). - |
Transitional cell carcinoma of the bladder Pathogenic:1
| Likely pathogenic, no assertion criteria provided | literature only | Database of Curated Mutations (DoCM) | May 31, 2016 | - - |
Adenoid cystic carcinoma 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 | - - |
Neoplasm of the large intestine Pathogenic:1
| Likely pathogenic, no assertion criteria provided | literature only | Database of Curated Mutations (DoCM) | May 31, 2016 | - - |
Thyroid tumor Pathogenic:1
| Likely pathogenic, no assertion criteria provided | literature only | Database of Curated Mutations (DoCM) | May 31, 2016 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Uncertain
DANN
Uncertain
DEOGEN2
Benign
T
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Uncertain
D
LIST_S2
Pathogenic
D
M_CAP
Benign
D
MetaRNN
Uncertain
D
MetaSVM
Benign
T
MutationAssessor
Benign
N
MutationTaster
Benign
D
PrimateAI
Pathogenic
D
PROVEAN
Benign
N
REVEL
Uncertain
Sift
Uncertain
D
Sift4G
Benign
T
Polyphen
B
Vest4
MutPred
Loss of ubiquitination at K1041 (P = 0.0502);
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at