16-81786050-G-C

Position:

• chr16-81786050-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_002661.5(PLCG2):​c.61G>C​(p.Ala21Pro) 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. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PLCG2 NM_002661.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.44

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]

PLCG2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.28273845).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PLCG2	NM_002661.5	c.61G>C	p.Ala21Pro	missense_variant	2/33	ENST00000564138.6	NP_002652.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PLCG2	ENST00000564138.6	c.61G>C	p.Ala21Pro	missense_variant	2/33	1	NM_002661.5	ENSP00000482457.1

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

Autoinflammation-PLCG2-associated antibody deficiency-immune dysregulation Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Neuberg Centre For Genomic Medicine, NCGM

May 20, 2023

The observed missense c.61G>C(p.Ala21Pro) variant in PLCG2 gene has not been reported previously as a pathogenic variant nor a benign variant, to our knowledge. The p.Ala21Pro variant is absent in gnomAD Exomes. This variant has not been submitted to the ClinVar database. Computational evidences (Polyphen - Benign, SIFT - Tolerated and MutationTaster - Disease causing) predict conflicting evidence on protein structure and function for this variant. The amino acid change p.Ala21Pro in PLCG2 is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. The amino acid Ala at position 21 is changed to a Pro changing protein sequence and it might alter its composition and physico-chemical properties. For these reasons, this variant has been classified as a Variant of Uncertain Significance (VUS). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Benign	-0.0027	T
BayesDel_noAF	Benign	-0.24
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.37	T;T;.
Eigen	Benign	-0.18
Eigen_PC	Benign	-0.019
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Benign	0.85	D;D;D
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.28	T;T;T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	1.4	.;L;.
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-1.0	N;.;N
REVEL	Benign	0.23
Sift	Benign	0.31	T;.;T
Sift4G	Benign	0.25	T;T;T
Polyphen		0.17	.;B;.
Vest4		0.47, 0.46
MutPred		0.55		Loss of helix (P = 0.0558);Loss of helix (P = 0.0558);Loss of helix (P = 0.0558);
MVP		0.72
MPC		0.11
ClinPred		0.51	D
GERP RS		2.9
Varity_R		0.27
gMVP		0.55

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: chr16-81819655;