3-179199737-C-G

Position:

• chr3-179199737-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_006218.4(PIK3CA):​c.400C>G​(p.Pro134Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. P134S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PIK3CA NM_006218.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.54

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 Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, PIK3CA
• BP4: Computational evidence support a benign effect (MetaRNN=0.22684687).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PIK3CA	NM_006218.4	c.400C>G	p.Pro134Ala	missense_variant	3/21	ENST00000263967.4
PIK3CA	XM_006713658.5	c.400C>G	p.Pro134Ala	missense_variant	3/21

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PIK3CA	ENST00000263967.4	c.400C>G	p.Pro134Ala	missense_variant	3/21	2	NM_006218.4	P1
PIK3CA	ENST00000643187.1	c.400C>G	p.Pro134Ala	missense_variant	3/22
PIK3CA	ENST00000675467.1	n.3207C>G		non_coding_transcript_exon_variant	2/20
PIK3CA	ENST00000675786.1	c.400C>G	p.Pro134Ala	missense_variant, NMD_transcript_variant	3/21

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 02, 2022

The p.P134A variant (also known as c.400C>G), located in coding exon 2 of the PIK3CA gene, results from a C to G substitution at nucleotide position 400. The proline at codon 134 is replaced by alanine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Benign	-0.092	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	19
DANN	Benign	0.97
DEOGEN2	Uncertain	0.72	D;.
Eigen	Benign	-0.070
Eigen_PC	Benign	0.11
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.23	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.67	T
PROVEAN	Uncertain	-2.9	D;.
REVEL	Benign	0.064
Sift	Benign	0.16	T;.
Sift4G	Benign	0.15	T;.
Polyphen		0.0050	B;.
Vest4		0.55
MutPred		0.39		Loss of methylation at K132 (P = 0.0548);Loss of methylation at K132 (P = 0.0548);
MVP		0.44
MPC		0.76
ClinPred		0.73	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.34
gMVP		0.50

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr3-178917525;