20-41162979-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP2 BP4_Strong

The NM_002660.3(PLCG1):c.703G>A(p.Ala235Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,802 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: PLCG1 NM_002660.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.94

Genes affected

PLCG1 (HGNC:9065): (phospholipase C gamma 1) 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 receptor-mediated tyrosine kinase activators. For example, when activated by SRC, the encoded protein causes the Ras guanine nucleotide exchange factor RasGRP1 to translocate to the Golgi, where it activates Ras. Also, this protein has been shown to be a major substrate for heparin-binding growth factor 1 (acidic fibroblast growth factor)-activated tyrosine kinase. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PP2: Missense variant where missense usually causes diseases, PLCG1
• BP4: Computational evidence support a benign effect (MetaRNN=0.058297843).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PLCG1	NM_002660.3	c.703G>A	p.Ala235Thr	missense_variant	7/32	ENST00000685551.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PLCG1	ENST00000685551.1	c.703G>A	p.Ala235Thr	missense_variant	7/32		NM_002660.3	P3
PLCG1	ENST00000373271.5	c.703G>A	p.Ala235Thr	missense_variant	7/32	1		A1
PLCG1	ENST00000244007.7	c.703G>A	p.Ala235Thr	missense_variant	8/33	5		P3
PLCG1	ENST00000492148.5	n.18G>A		non_coding_transcript_exon_variant	1/4	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461802 Hom.: 0 Cov.: 31 AF XY: 0.0000110 AC XY: 8 AN XY: 727204

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000899

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 11, 2022

The c.703G>A (p.A235T) alteration is located in exon 7 (coding exon 7) of the PLCG1 gene. This alteration results from a G to A substitution at nucleotide position 703, causing the alanine (A) at amino acid position 235 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.064
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
Cadd	Benign	19
Dann	Benign	0.92
Eigen	Benign	-0.48
Eigen_PC	Benign	-0.33
FATHMM_MKL	Benign	0.51	D
LIST_S2	Benign	0.55	T;T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.058	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.76	N;N
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.44	T
PROVEAN	Benign	-0.34	N;N
REVEL	Benign	0.041
Sift	Benign	0.42	T;T
Sift4G	Benign	0.40	T;T
Polyphen		0.0	.;B
Vest4		0.034
MutPred		0.38		Gain of phosphorylation at A235 (P = 0.067);Gain of phosphorylation at A235 (P = 0.067);
MVP		0.29
ClinPred		0.036	T
GERP RS		1.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.018
gMVP		0.19

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: chr20-39791619;