16-81940000-T-A

Position:

• chr16-81940000-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The ENST00000564138.6(PLCG2):​c.3422T>A​(p.Met1141Lys) 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M1141I) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: PLCG2 ENST00000564138.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.67

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.838

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PLCG2	NM_002661.5	c.3422T>A	p.Met1141Lys	missense_variant	30/33	ENST00000564138.6	NP_002652.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PLCG2	ENST00000564138.6	c.3422T>A	p.Met1141Lys	missense_variant	30/33	1	NM_002661.5	ENSP00000482457	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial cold autoinflammatory syndrome 3 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 07, 2021

This sequence change replaces methionine with lysine at codon 1141 of the PLCG2 protein (p.Met1141Lys). The methionine residue is highly conserved and there is a moderate physicochemical difference between methionine and lysine. This variant is not present in population databases (ExAC no frequency). This variant has been observed in individual(s) with clinical features of PLCG2-associated conditions (PMID: 31853824). ClinVar contains an entry for this variant (Variation ID: 540103). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. 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	0.96
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.23
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.78	D;.
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.95	D;D
M_CAP	Benign	0.040	D
MetaRNN	Pathogenic	0.84	D;D
MetaSVM	Benign	-0.38	T
MutationAssessor	Benign	1.6	L;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.76	T
PROVEAN	Pathogenic	-5.1	.;D
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0010	.;D
Sift4G	Uncertain	0.0020	D;D
Polyphen		0.71	P;.
Vest4		0.84
MutPred		0.56		Gain of ubiquitination at M1141 (P = 0.0155);Gain of ubiquitination at M1141 (P = 0.0155);
MVP		0.91
MPC		0.95
ClinPred		0.98	D
GERP RS		5.8
Varity_R		0.94
gMVP		0.80

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: rs958943394; hg19: chr16-81973605; COSMIC: COSV63867640; COSMIC: COSV63867640;