rs1555517092

Variant names:

• chr16-81891546-G-A
• rs1555517092
• NM_002661.5:c.942G>A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_002661.5(PLCG2):​c.942G>A​(p.Met314Ile) 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 Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: PLCG2 NM_002661.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 10.0

Genes affected

PLCG2 (HGNC:9066): (phospholipase C gamma 2) The protein encoded by this gene is a transmembrane signaling enzyme that catalyzes the conversion of 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate to 1D-myo-inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG) using calcium as a cofactor. IP3 and DAG are second messenger molecules important for transmitting signals from growth factor receptors and immune system receptors across the cell membrane. Mutations in this gene have been found in autoinflammation, antibody deficiency, and immune dysregulation syndrome and familial cold autoinflammatory syndrome 3. [provided by RefSeq, Mar 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.91

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PLCG2	NM_002661.5	c.942G>A	p.Met314Ile	missense_variant	Exon 11 of 33	ENST00000564138.6	NP_002652.2
PLCG2	NM_001425749.1	c.942G>A	p.Met314Ile	missense_variant	Exon 12 of 34		NP_001412678.1
PLCG2	NM_001425750.1	c.942G>A	p.Met314Ile	missense_variant	Exon 11 of 33		NP_001412679.1
PLCG2	NM_001425751.1	c.942G>A	p.Met314Ile	missense_variant	Exon 12 of 34		NP_001412680.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PLCG2	ENST00000564138.6	c.942G>A	p.Met314Ile	missense_variant	Exon 11 of 33	1	NM_002661.5	ENSP00000482457.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial cold autoinflammatory syndrome 3;C3553961:Autoinflammation-PLCG2-associated antibody deficiency-immune dysregulation Uncertain:1

Jan 14, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Familial cold autoinflammatory syndrome 3 Uncertain:1

Nov 18, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces methionine with isoleucine at codon 314 of the PLCG2 protein (p.Met314Ile). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and isoleucine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with PLCG2-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.95	D;.
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.1
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D;D
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.91	D;D
MetaSVM	Uncertain	0.65	D
MutationAssessor	Pathogenic	4.5	H;.
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-3.5	.;D
REVEL	Pathogenic	0.72
Sift	Uncertain	0.0040	.;D
Sift4G	Uncertain	0.0070	D;D
Polyphen		1.0	D;.
Vest4		0.94
MutPred		0.74		Loss of helix (P = 0.028);Loss of helix (P = 0.028);
MVP		0.91
MPC		0.41
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.57
gMVP		0.93

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

LitVar

Other links and lift over

dbSNP: rs1555517092; hg19: chr16-81925151;