19-52190170-T-C

Variant names:

• chr19-52190170-T-C
• NM_014225.6:c.74T>C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM1 PM2 PP2 BP4

The NM_014225.6(PPP2R1A):​c.74T>C​(p.Val25Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts 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. V25F) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: PPP2R1A NM_014225.6 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.18

Genes affected

PPP2R1A (HGNC:9302): (protein phosphatase 2 scaffold subunit Aalpha) This gene encodes a constant regulatory subunit of protein phosphatase 2. Protein phosphatase 2 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. The constant regulatory subunit A serves as a scaffolding molecule to coordinate the assembly of the catalytic subunit and a variable regulatory B subunit. This gene encodes an alpha isoform of the constant regulatory subunit A. Alternatively spliced transcript variants have been described. [provided by RefSeq, Apr 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_014225.6
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the PPP2R1A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 15 curated pathogenic missense variants (we use a threshold of 10). The gene has 31 curated benign missense variants. Gene score misZ: 4.4565 (above the threshold of 3.09). Trascript score misZ: 5.4176 (above the threshold of 3.09). GenCC associations: The gene is linked to intellectual disability, autosomal dominant 40, Houge-Janssens syndrome 2, complex neurodevelopmental disorder.
• BP4: Computational evidence support a benign effect (MetaRNN=0.40920314).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PPP2R1A	NM_014225.6	c.74T>C	p.Val25Ala	missense_variant	Exon 1 of 15	ENST00000322088.11	NP_055040.2
PPP2R1A	NR_033500.2	n.119T>C		non_coding_transcript_exon_variant	Exon 1 of 14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PPP2R1A	ENST00000322088.11	c.74T>C	p.Val25Ala	missense_variant	Exon 1 of 15	1	NM_014225.6	ENSP00000324804.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Feb 13, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 25 of the PPP2R1A protein (p.Val25Ala). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with PPP2R1A-related conditions. 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 not expected to disrupt PPP2R1A protein function with a negative predictive value of 80%. 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. -

Jun 11, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.034	T
BayesDel_noAF	Benign	-0.19
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.76	D;.;T;.
Eigen	Benign	0.087
Eigen_PC	Benign	0.16
FATHMM_MKL	Benign	0.67	D
LIST_S2	Uncertain	0.97	D;D;D;D
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.41	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Pathogenic	3.0	M;.;.;.
PrimateAI	Pathogenic	0.95	D
PROVEAN	Uncertain	-3.5	D;D;.;.
REVEL	Benign	0.28
Sift	Uncertain	0.0020	D;D;.;.
Sift4G	Uncertain	0.044	D;D;D;D
Polyphen		0.018	B;.;.;.
Vest4		0.59
MutPred		0.41		Gain of disorder (P = 0.0666);Gain of disorder (P = 0.0666);Gain of disorder (P = 0.0666);Gain of disorder (P = 0.0666);
MVP		0.66
MPC		1.6
ClinPred		0.97	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.51
gMVP		0.84

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: chr19-52693423;