20-8132664-C-G

Position:

• chr20-8132664-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_015192.4(PLCB1):​c.13C>G​(p.Gln5Glu) 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. Q5H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PLCB1 NM_015192.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.05

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 1 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), PLCB1. . Gene score misZ 3.8345 (greater than the threshold 3.09). Trascript score misZ 3.6982 (greater than threshold 3.09). GenCC has associacion of gene with developmental and epileptic encephalopathy, 12, malignant migrating partial seizures of infancy, developmental and epileptic encephalopathy, West syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.18194932).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PLCB1	NM_015192.4	c.13C>G	p.Gln5Glu	missense_variant	1/32	ENST00000338037.11
PLCB1	NM_182734.3	c.13C>G	p.Gln5Glu	missense_variant	1/33

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PLCB1	ENST00000338037.11	c.13C>G	p.Gln5Glu	missense_variant	1/32	1	NM_015192.4	P1

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

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 13, 2021

The c.13C>G (p.Q5E) alteration is located in exon 1 (coding exon 1) of the PLCB1 gene. This alteration results from a C to G substitution at nucleotide position 13, causing the glutamine (Q) at amino acid position 5 to be replaced by a glutamic acid (E). 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	0.22
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.21	.;T;.;.;.
Eigen	Benign	0.098
Eigen_PC	Benign	0.22
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.93	.;D;D;D;D
M_CAP	Uncertain	0.19	D
MetaRNN	Benign	0.18	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.3	L;L;.;.;L
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	-0.60	N;N;.;.;N
REVEL	Benign	0.085
Sift	Benign	0.035	D;D;.;.;D
Sift4G	Benign	0.50	T;T;T;T;T
Polyphen		0.77	P;B;.;.;P
Vest4		0.31
MutPred		0.18		Gain of relative solvent accessibility (P = 0.1894);Gain of relative solvent accessibility (P = 0.1894);Gain of relative solvent accessibility (P = 0.1894);Gain of relative solvent accessibility (P = 0.1894);Gain of relative solvent accessibility (P = 0.1894);
MVP		0.32
MPC		0.11
ClinPred		0.86	D
GERP RS		4.8
Varity_R		0.29
gMVP		0.19

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: chr20-8113311;