chr3-46021223-T-C

Position:

• chr3-46021223-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001024644.2(XCR1):​c.725A>G​(p.Asn242Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000132 in 151,968 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.000013 (0 hom., cov: 32)
• Consequence: XCR1 NM_001024644.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.98

Genes affected

XCR1 (HGNC:1625): (X-C motif chemokine receptor 1) The protein encoded by this gene is a chemokine receptor belonging to the G protein-coupled receptor superfamily. The family members are characterized by the presence of 7 transmembrane domains. The encoded protein transduces a signal by increasing the intracellular calcium ion level. The viral macrophage inflammatory protein-II is an antagonist of this receptor and blocks signaling. Some studies have implicated a cluster of genes at 3p21.31, including this gene, as associated with COVID-19 risk. The encoded protein may also play a role in cell proliferation and migration in several types of cancer. [provided by RefSeq, Jan 2023]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.957

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
XCR1	NM_001024644.2	c.725A>G	p.Asn242Ser	missense_variant	2/2	ENST00000309285.4	NP_001019815.1
XCR1	NM_001381860.1	c.725A>G	p.Asn242Ser	missense_variant	4/4		NP_001368789.1
XCR1	NM_005283.3	c.725A>G	p.Asn242Ser	missense_variant	3/3		NP_005274.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
XCR1	ENST00000309285.4	c.725A>G	p.Asn242Ser	missense_variant	2/2	1	NM_001024644.2	ENSP00000310405.3
XCR1	ENST00000395946.3	c.725A>G	p.Asn242Ser	missense_variant	3/3	1		ENSP00000379277.3
XCR1	ENST00000683768.1	c.725A>G	p.Asn242Ser	missense_variant	6/6			ENSP00000507745.1

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 151968 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.000956

GnomAD4 exome Cov.: 30

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 151968 Hom.: 0 Cov.: 32 AF XY: 0.0000270 AC XY: 2 AN XY: 74202

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.000956

Bravo AF: 0.00000756

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

Aug 20, 2024

The c.725A>G (p.N242S) alteration is located in exon 3 (coding exon 1) of the XCR1 gene. This alteration results from a A to G substitution at nucleotide position 725, causing the asparagine (N) at amino acid position 242 to be replaced by a serine (S). 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	0.23
BayesDel_addAF	Benign	-0.077	T
BayesDel_noAF	Benign	-0.35
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.40	T
Eigen	Pathogenic	0.74
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.85	T
M_CAP	Benign	0.041	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Benign	-0.42	T
MutationAssessor	Pathogenic	3.1	M
PrimateAI	Uncertain	0.48	T
PROVEAN	Pathogenic	-4.8	D
REVEL	Uncertain	0.49
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.85
MutPred		0.75		Gain of sheet (P = 0.1945);
MVP		0.64
MPC		1.0
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.78
gMVP		0.54

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: rs1708137959; hg19: chr3-46062715;