1-204409499-C-G

Position:

• chr1-204409499-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_032833.5(PPP1R15B):​c.1913G>C​(p.Arg638Thr) 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PPP1R15B NM_032833.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.79

Genes affected

PPP1R15B (HGNC:14951): (protein phosphatase 1 regulatory subunit 15B) This gene encodes a protein phosphatase I-interacting protein that promotes the dephosphorylation of eukaryotic translation initiation factor 2A to regulate translation under conditions of cellular stress. The transcribed messenger RNA contains two upstream open reading frames (ORFs) that repress translation of the main protein coding ORF under normal conditions, while the protein coding ORF is expressed at high levels in response to stress. Continual translation of the mRNA under conditions of eukaryotic translation initiation factor 2A inactivation is thought to create a feedback loop for reactivation of the gene during recovery from stress. In addition, it has been shown that this protein plays a role in membrane traffic that is independent of translation and that it is required for exocytosis from erythroleukemia cells. Allelic variants of this gene are associated with microcephaly, short stature, and impaired glucose metabolism. [provided by RefSeq, Feb 2016]

PPP1R15B-AS1 (HGNC:55838): (PPP1R15B and PIK3C2B antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.417455).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PPP1R15B	NM_032833.5	c.1913G>C	p.Arg638Thr	missense_variant	1/2	ENST00000367188.5
PPP1R15B	XM_005245551.6	c.1913G>C	p.Arg638Thr	missense_variant	1/3
PPP1R15B	XM_047432518.1	c.1913G>C	p.Arg638Thr	missense_variant	1/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PPP1R15B	ENST00000367188.5	c.1913G>C	p.Arg638Thr	missense_variant	1/2	1	NM_032833.5	P1
PPP1R15B-AS1	ENST00000443515.1	n.147-25838C>G		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

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

Mar 15, 2024

The c.1913G>C (p.R638T) alteration is located in exon 1 (coding exon 1) of the PPP1R15B gene. This alteration results from a G to C substitution at nucleotide position 1913, causing the arginine (R) at amino acid position 638 to be replaced by a threonine (T). 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	0.31
BayesDel_addAF	Uncertain	0.058	T
BayesDel_noAF	Benign	-0.16
CADD	Uncertain	25
DANN	Uncertain	0.98
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.42	T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	0.96	D
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-1.9	N
REVEL	Benign	0.15
Sift	Benign	0.041	D
Sift4G	Uncertain	0.0060	D
Vest4		0.49
MutPred		0.61		Loss of solvent accessibility (P = 0.0151);
MVP		0.72
MPC		0.28
ClinPred		0.79	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
gMVP		0.25

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: chr1-204378627;