chr1-161548546-C-G

Position:

• chr1-161548546-C-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000569.8(FCGR3A):​c.194G>C​(p.Ser65Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000723 in 1,382,624 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S65N) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 35)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: FCGR3A NM_000569.8 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -3.24

Genes affected

FCGR3A (HGNC:3619): (Fc gamma receptor IIIa) This gene encodes a receptor for the Fc portion of immunoglobulin G, and it is involved in the removal of antigen-antibody complexes from the circulation, as well as other responses, including antibody dependent cellular mediated cytotoxicity and antibody dependent enhancement of virus infections. This gene (FCGR3A) is highly similar to another nearby gene (FCGR3B) located on chromosome 1. The receptor encoded by this gene is expressed on natural killer (NK) cells as an integral membrane glycoprotein anchored through a transmembrane peptide, whereas FCGR3B is expressed on polymorphonuclear neutrophils (PMN) where the receptor is anchored through a phosphatidylinositol (PI) linkage. Mutations in this gene are associated with immunodeficiency 20, and have been linked to susceptibility to recurrent viral infections, susceptibility to systemic lupus erythematosus, and alloimmune neonatal neutropenia. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2020]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.032966763).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FCGR3A	NM_000569.8	c.194G>C	p.Ser65Thr	missense_variant	3/5	ENST00000443193.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FCGR3A	ENST00000443193.6	c.194G>C	p.Ser65Thr	missense_variant	3/5	1	NM_000569.8	P4

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD4 exome AF: 7.23e-7 AC: 1 AN: 1382624 Hom.: 0 Cov.: 65 AF XY: 0.00 AC XY: 0 AN XY: 688158

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: 9.55e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 35

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.072
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.64
CADD	Benign	0.0070
DANN	Benign	0.088
DEOGEN2	Benign	0.017	.;T;T;T;.;.;.
Eigen	Benign	-2.0
Eigen_PC	Benign	-2.1
FATHMM_MKL	Benign	0.0038	N
LIST_S2	Benign	0.42	T;.;.;T;T;T;T
M_CAP	Benign	0.0031	T
MetaRNN	Benign	0.033	T;T;T;T;T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	-0.30	.;N;N;N;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.36	.;.;N;N;.;.;N
REVEL	Benign	0.019
Sift	Benign	1.0	.;.;T;T;.;.;T
Sift4G	Benign	0.99	.;T;T;T;.;.;.
Polyphen		0.0	.;B;B;B;.;.;.
Vest4		0.071
MVP		0.088
MPC		0.12
ClinPred		0.054	T
GERP RS		-8.9
Varity_R		0.14
gMVP		0.19

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs77144485; hg19: chr1-161518336;