NM_006218.4:c.1033A>C

Variant names:

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1PM2PM5PP2PP3

The NM_006218.4(PIK3CA):c.1033A>C(p.Asn345His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N345K) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 32)

Consequence

PIK3CA
NM_006218.4 missense

Scores

Clinical Significance

Likely pathogenic no assertion criteria provided P:10

Conservation

PhyloP100: 8.81

Publications

8 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:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

PM1

In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 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 chr3-179203765-T-A is described in ClinVar as Pathogenic. ClinVar VariationId is 376050.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP2

Missense variant in the PIK3CA gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 98 curated pathogenic missense variants (we use a threshold of 10). The gene has 13 curated benign missense variants. Gene score misZ: 5.5986 (above the threshold of 3.09). Trascript score misZ: 6.1406 (above the threshold of 3.09). GenCC associations: The gene is linked to megalencephaly-capillary malformation-polymicrogyria syndrome, vascular malformation, Cowden syndrome 5, overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes, Cowden disease, hereditary breast carcinoma, familial ovarian cancer.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.802

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PIK3CA	NM_006218.4 link	c.1033A>C	p.Asn345His	missense_variant	Exon 5 of 21	ENST00000263967.4	NP_006209.2	P42336Q4LE51
PIK3CA	XM_006713658.5 link	c.1033A>C	p.Asn345His	missense_variant	Exon 5 of 21		XP_006713721.1	P42336Q4LE51

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PIK3CA	ENST00000263967.4 link	c.1033A>C	p.Asn345His	missense_variant	Exon 5 of 21	2	NM_006218.4	ENSP00000263967.3		P42336

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:10

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

Glioblastoma

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Prostate adenocarcinoma

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Malignant neoplasm of body of uterus

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Gastric adenocarcinoma

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Breast neoplasm

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Lung adenocarcinoma

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Adenoid cystic carcinoma

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Uterine carcinosarcoma

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Squamous cell carcinoma of the head and neck

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Neoplasm of the large intestine

Pathogenic:1

May 31, 2016

Database of Curated Mutations (DoCM)

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.95

BayesDel_addAF

Uncertain

0.093

BayesDel_noAF

Benign

-0.10

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.79

D;.

Eigen

Pathogenic

0.79

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Uncertain

0.10

MetaRNN

Pathogenic

0.80

D;D

MetaSVM

Uncertain

0.043

MutationAssessor

Uncertain

2.6

M;.

PhyloP100

8.8

PrimateAI

Pathogenic

0.87

PROVEAN

Uncertain

-2.9

D;.

REVEL

Uncertain

0.62

Sift

Uncertain

0.011

D;.

Sift4G

Uncertain

0.011

D;.

Polyphen

1.0

D;.

Vest4

0.84

MutPred

0.53

Loss of MoRF binding (P = 0.1405);Loss of MoRF binding (P = 0.1405);

MVP

0.79

MPC

1.9

ClinPred

0.99

GERP RS

5.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.76

gMVP

0.84

Mutation Taster

=55/45

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over