20-9362974-C-G

Variant names:

• chr20-9362974-C-G
• rs759189106
• NM_001377142.1:c.448C>G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_001377142.1(PLCB4):​c.448C>G​(p.His150Asp) variant causes a missense, splice region 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. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: PLCB4 NM_001377142.1 missense, splice_region
• Scores: Splicing: ADA: 0.9933
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.35

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the PLCB4 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 15 curated pathogenic missense variants (we use a threshold of 10). The gene has 18 curated benign missense variants. Gene score misZ: 3.5718 (above the threshold of 3.09). Trascript score misZ: 3.2758 (above the threshold of 3.09). GenCC associations: The gene is linked to auriculocondylar syndrome 1, auriculocondylar syndrome, auriculocondylar syndrome 2.
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PLCB4	NM_001377142.1	c.448C>G	p.His150Asp	missense_variant, splice_region_variant	Exon 8 of 40	ENST00000378473.9	NP_001364071.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PLCB4	ENST00000378473.9	c.448C>G	p.His150Asp	missense_variant, splice_region_variant	Exon 8 of 40	1	NM_001377142.1	ENSP00000367734.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Dec 02, 2016

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The H150D variant in the PLCB4 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The H150D variant was not observed in approximately 6500 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 H150D 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. While this substitution occurs at a position that is not conserved across species, in silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret H150D as a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.10
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.69	.;D;.;D;.
Eigen	Pathogenic	0.83
Eigen_PC	Pathogenic	0.83
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.91	D;D;.;.;D
M_CAP	Benign	0.040	D
MetaRNN	Pathogenic	0.87	D;D;D;D;D
MetaSVM	Benign	-0.68	T
MutationAssessor	Uncertain	2.3	M;M;M;M;M
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-6.6	D;D;.;D;D
REVEL	Uncertain	0.48
Sift	Benign	0.041	D;D;.;D;D
Sift4G	Benign	0.17	T;T;T;T;T
Polyphen		0.98, 1.0	.;D;.;D;D
Vest4		0.92
MutPred		0.50		Loss of MoRF binding (P = 0.048);Loss of MoRF binding (P = 0.048);Loss of MoRF binding (P = 0.048);Loss of MoRF binding (P = 0.048);Loss of MoRF binding (P = 0.048);
MVP		0.84
MPC		2.0
ClinPred		0.98	D
GERP RS		5.9
Varity_R		0.70
gMVP		0.83

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.99
dbscSNV1_RF	Pathogenic	0.87
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

LitVar

Other links and lift over

dbSNP: rs759189106; hg19: chr20-9343621; COSMIC: COSV53813175;