chr1-161543096-G-T

Position:

• chr1-161543096-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_000569.8(FCGR3A):​c.681C>A​(p.Phe227Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FCGR3A NM_000569.8 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.197

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]

ENSG00000273112 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a mutagenesis_site Decreases the association with either CD247 or FCER1G. Decreases cell surface expression; when associated with A-226 and A-228. (size 0) in uniprot entity FCG3A_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.28137004).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FCGR3A	NM_000569.8	c.681C>A	p.Phe227Leu	missense_variant	5/5	ENST00000443193.6	NP_000560.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FCGR3A	ENST00000443193.6	c.681C>A	p.Phe227Leu	missense_variant	5/5	1	NM_000569.8	ENSP00000392047.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

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

Nov 15, 2024

The c.789C>A (p.F263L) alteration is located in exon 5 (coding exon 5) of the FCGR3A gene. This alteration results from a C to A substitution at nucleotide position 789, causing the phenylalanine (F) at amino acid position 263 to be replaced by a leucine (L). 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	Pathogenic	0.63
BayesDel_addAF	Benign	-0.042	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	10
DANN	Uncertain	1.0
DEOGEN2	Benign	0.092	.;T;T;T;.;.
Eigen	Benign	-0.23
Eigen_PC	Benign	-0.29
FATHMM_MKL	Benign	0.16	N
LIST_S2	Benign	0.69	T;.;.;T;T;T
M_CAP	Benign	0.0049	T
MetaRNN	Benign	0.28	T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.1	.;M;M;M;.;.
PrimateAI	Benign	0.44	T
PROVEAN	Uncertain	-3.0	.;.;D;D;.;.
REVEL	Benign	0.19
Sift	Uncertain	0.0040	.;.;D;D;.;.
Sift4G	Uncertain	0.052	.;T;T;T;.;.
Polyphen		0.81	.;P;P;P;.;.
Vest4		0.13
MVP		0.13
MPC		0.31
ClinPred		0.96	D
GERP RS		2.4
Varity_R		0.45
gMVP		0.096

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: chr1-161512886;