5-134199117-T-C

Position:

• chr5-134199117-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_002715.4(PPP2CA):​c.826A>G​(p.Met276Val) 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PPP2CA NM_002715.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.66

Genes affected

PPP2CA (HGNC:9299): (protein phosphatase 2 catalytic subunit alpha) This gene encodes the phosphatase 2A catalytic subunit. Protein phosphatase 2A is one of the four major Ser/Thr phosphatases, and it is implicated in the negative control of cell growth and division. It consists of a common heteromeric core enzyme, which is composed of a catalytic subunit and a constant regulatory subunit, that associates with a variety of regulatory subunits. This gene encodes an alpha isoform of the catalytic subunit. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PPP2CA. . Gene score misZ 4.1504 (greater than the threshold 3.09). Trascript score misZ 5.562 (greater than threshold 3.09). GenCC has associacion of gene with Houge-Janssens syndrome 3.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.768

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PPP2CA	NM_002715.4	c.826A>G	p.Met276Val	missense_variant	6/7	ENST00000481195.6
PPP2CA	NM_001355019.2	c.631A>G	p.Met211Val	missense_variant	6/7
PPP2CA	NR_149151.2	n.1081A>G		non_coding_transcript_exon_variant	6/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PPP2CA	ENST00000481195.6	c.826A>G	p.Met276Val	missense_variant	6/7	1	NM_002715.4	P4

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

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 25, 2021

This sequence change replaces methionine with valine at codon 276 of the PPP2CA protein (p.Met276Val). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and valine. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with PPP2CA-related conditions. This variant is not present in population databases (ExAC no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.73	D
Eigen	Uncertain	0.21
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.020	T
MetaRNN	Pathogenic	0.77	D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.3	M
MutationTaster	Benign	1.0	D
PROVEAN	Benign	-2.3	N
REVEL	Benign	0.27
Sift	Benign	0.046	D
Sift4G	Uncertain	0.042	D
Polyphen		0.047	B
Vest4		0.76
MutPred		0.62		Gain of sheet (P = 0.0827);
MVP		0.82
MPC		1.8
ClinPred		0.92	D
GERP RS		5.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.74
gMVP		0.89

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: chr5-133534808;