20-9365464-G-T

Position:

• chr20-9365464-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP2 PP3_Moderate PP5_Moderate

The NM_001377142.1(PLCB4):​c.453G>T​(p.Trp151Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PLCB4 NM_001377142.1 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.40

Genes affected

PLCB4 (HGNC:9059): (phospholipase C beta 4) 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 in the retina. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2010]

PLCB4 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 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), PLCB4. . Gene score misZ 3.5718 (greater than the threshold 3.09). Trascript score misZ 3.2758 (greater than threshold 3.09). GenCC has associacion of gene with auriculocondylar syndrome 1, auriculocondylar syndrome, auriculocondylar syndrome 2.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.907
• PP5: Variant 20-9365464-G-T is Pathogenic according to our data. Variant chr20-9365464-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 382944.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PLCB4	NM_001377142.1	c.453G>T	p.Trp151Cys	missense_variant	9/40	ENST00000378473.9	NP_001364071.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PLCB4	ENST00000378473.9	c.453G>T	p.Trp151Cys	missense_variant	9/40	1	NM_001377142.1	ENSP00000367734.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Aug 03, 2016

The W151C variant in the PLCB4 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The W151C variant was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The W151C variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. The W151C variant is a strong candidate for a pathogenic variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Uncertain	0.13
CADD	Pathogenic	32
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.84	.;D;.;D;.
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D;D;.;.;D
M_CAP	Uncertain	0.094	D
MetaRNN	Pathogenic	0.91	D;D;D;D;D
MetaSVM	Benign	-0.49	T
MutationAssessor	Uncertain	2.4	M;M;M;M;M
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-11	D;D;.;D;D
REVEL	Uncertain	0.64
Sift	Uncertain	0.0040	D;D;.;D;D
Sift4G	Uncertain	0.0050	D;D;D;D;D
Polyphen		1.0, 1.0	.;D;.;D;D
Vest4		0.87
MutPred		0.74		Loss of MoRF binding (P = 0.0076);Loss of MoRF binding (P = 0.0076);Loss of MoRF binding (P = 0.0076);Loss of MoRF binding (P = 0.0076);Loss of MoRF binding (P = 0.0076);
MVP		0.65
MPC		2.1
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.80
gMVP		0.89

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.12		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: rs1057521489; hg19: chr20-9346111;