2-44202008-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002706.6(PPM1B):c.809A>G(p.Asn270Ser) 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. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PPM1B NM_002706.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.57

Genes affected

PPM1B (HGNC:9276): (protein phosphatase, Mg2+/Mn2+ dependent 1B) The protein encoded by this gene is a member of the PP2C family of Ser/Thr protein phosphatases. PP2C family members are known to be negative regulators of cell stress response pathways. This phosphatase has been shown to dephosphorylate cyclin-dependent kinases (CDKs), and thus may be involved in cell cycle control. Overexpression of this phosphatase is reported to cause cell-growth arrest or cell death. Alternative splicing results in multiple transcript variants encoding different isoforms. Additional transcript variants have been described, but currently do not represent full-length sequences. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09649837).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PPM1B	NM_002706.6	c.809A>G	p.Asn270Ser	missense_variant	2/6	ENST00000282412.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PPM1B	ENST00000282412.9	c.809A>G	p.Asn270Ser	missense_variant	2/6	1	NM_002706.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 07, 2022

The c.809A>G (p.N270S) alteration is located in exon 2 (coding exon 1) of the PPM1B gene. This alteration results from a A to G substitution at nucleotide position 809, causing the asparagine (N) at amino acid position 270 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.063
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.73
Cadd	Benign	16
Dann	Benign	0.76
Eigen	Benign	-0.52
Eigen_PC	Benign	-0.23
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Uncertain	0.86	D;D;D;D
M_CAP	Benign	0.0040	T
MetaRNN	Benign	0.096	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	0.65	D;D;D;D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	0.37	N;N;N;N
REVEL	Benign	0.097
Sift	Benign	0.61	T;T;T;T
Sift4G	Benign	0.66	T;T;T;T
Polyphen		0.0	.;.;B;B
Vest4		0.067, 0.072, 0.062
MutPred		0.44		Gain of disorder (P = 0.0473);Gain of disorder (P = 0.0473);Gain of disorder (P = 0.0473);Gain of disorder (P = 0.0473);
MVP		0.52
MPC		0.11
ClinPred		0.62	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.16
gMVP		0.11

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs766283721; hg19: chr2-44429147; COSMIC: COSV56766182; COSMIC: COSV56766182;