20-8132671-G-T

Variant names:

• chr20-8132671-G-T
• NM_015192.4:c.20G>T

Variant summary

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

The NM_015192.4(PLCB1):​c.20G>T​(p.Gly7Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,459,932 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PLCB1 NM_015192.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.48

Genes affected

PLCB1 (HGNC:15917): (phospholipase C beta 1) The protein encoded by this gene catalyzes the formation of inositol 1,4,5-trisphosphate and diacylglycerol from phosphatidylinositol 4,5-bisphosphate. This reaction uses calcium as a cofactor and plays an important role in the intracellular transduction of many extracellular signals. This gene is activated by two G-protein alpha subunits, alpha-q and alpha-11. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PLCB1	NM_015192.4	c.20G>T	p.Gly7Val	missense_variant	Exon 1 of 32	ENST00000338037.11	NP_056007.1
PLCB1	NM_182734.3	c.20G>T	p.Gly7Val	missense_variant	Exon 1 of 33		NP_877398.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PLCB1	ENST00000338037.11	c.20G>T	p.Gly7Val	missense_variant	Exon 1 of 32	1	NM_015192.4	ENSP00000338185.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459932 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 726344

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

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

Jun 23, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.20G>T (p.G7V) alteration is located in exon 1 (coding exon 1) of the PLCB1 gene. This alteration results from a G to T substitution at nucleotide position 20, causing the glycine (G) at amino acid position 7 to be replaced by a valine (V). 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	Pathogenic	0.87
BayesDel_addAF	Benign	-0.012	T
BayesDel_noAF	Benign	-0.25
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.56	.;D;.;.;.
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.95	.;D;D;D;D
M_CAP	Pathogenic	0.50	D
MetaRNN	Uncertain	0.62	D;D;D;D;D
MetaSVM	Benign	-0.57	T
MutationAssessor	Uncertain	2.5	M;M;.;.;M
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-3.0	D;D;.;.;D
REVEL	Benign	0.25
Sift	Uncertain	0.0090	D;D;.;.;D
Sift4G	Uncertain	0.023	D;D;D;D;D
Polyphen		1.0	D;D;.;.;D
Vest4		0.68
MutPred		0.39		Loss of disorder (P = 0.0448);Loss of disorder (P = 0.0448);Loss of disorder (P = 0.0448);Loss of disorder (P = 0.0448);Loss of disorder (P = 0.0448);
MVP		0.31
MPC		0.14
ClinPred		0.98	D
GERP RS		3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.56
gMVP		0.67

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: chr20-8113318;