3-179229425-C-G

Variant names:

• chr3-179229425-C-G
• rs199826066
• NM_006218.4:c.2649C>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 5P and 2B. PM1 PM2 PP2 BP4_Moderate

The NM_006218.4(PIK3CA):​c.2649C>G​(p.Asp883Glu) 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. 16/22 in silico tools predict a benign 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. D883N) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PIK3CA NM_006218.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.98
• Publications: 0 publications found

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM1: In a domain PI3K/PI4K catalytic (size 286) in uniprot entity PK3CA_HUMAN there are 26 pathogenic changes around while only 1 benign (96%) in NM_006218.4
• PM2: Very rare variant in population databases, with high coverage
• 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.
• BP4: Computational evidence support a benign effect (MetaRNN=0.12068853).

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.2649C>G	p.Asp883Glu	missense	Exon 18 of 21	NP_006209.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIK3CA	ENST00000263967.4	TSL:2 MANE Select	c.2649C>G	p.Asp883Glu	missense	Exon 18 of 21	ENSP00000263967.3
	PIK3CA	ENST00000643187.1		c.2649C>G	p.Asp883Glu	missense	Exon 18 of 22	ENSP00000493507.1
	PIK3CA	ENST00000462255.2	TSL:3	n.1111C>G		non_coding_transcript_exon	Exon 9 of 11

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.099
BayesDel_addAF	Benign	-0.0045	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	17
DANN	Benign	0.77
DEOGEN2	Benign	0.35	T
Eigen	Benign	-0.49
Eigen_PC	Benign	-0.26
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.80	T
M_CAP	Benign	0.039	D
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-0.92	T
MutationAssessor	Benign	-0.20	N
PhyloP100		2.0
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-0.95	N
REVEL	Benign	0.28
Sift	Benign	1.0	T
Sift4G	Benign	0.59	T
Polyphen		0.16	B
Vest4		0.51
MutPred		0.37		Gain of methylation at K882 (P = 0.0691)
MVP		0.66
MPC		1.5
ClinPred		0.62	D
GERP RS		4.7
Varity_R		0.17
gMVP		0.73
Mutation Taster		=68/32	polymorphism

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

Other links and lift over

dbSNP: rs199826066; hg19: chr3-178947213;