22-16783744-C-T

Position:

• chr22-16783744-C-T

Variant summary

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

The NM_001386955.1(XKR3):​c.1255G>A​(p.Ala419Thr) 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. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: XKR3 NM_001386955.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.01

Genes affected

XKR3 (HGNC:28778): (XK related 3) XKRX (MIM 300684) and XKR3 are homologs of the Kell blood group precursor XK (MIM 314850), which is a putative membrane transporter and a component of the XK/Kell complex of the Kell blood group system (Calenda et al., 2006 [PubMed 16431037]).[supplied by OMIM, Mar 2008]

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=0.041200966).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
XKR3	NM_001386955.1	c.1255G>A	p.Ala419Thr	missense_variant	4/4	ENST00000684488.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
XKR3	ENST00000684488.1	c.1255G>A	p.Ala419Thr	missense_variant	4/4		NM_001386955.1	P1
XKR3	ENST00000331428.5	c.1255G>A	p.Ala419Thr	missense_variant	4/4	1		P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 70

GnomAD4 genome Cov.: 33

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

Mar 03, 2022

The c.1255G>A (p.A419T) alteration is located in exon 4 (coding exon 3) of the XKR3 gene. This alteration results from a G to A substitution at nucleotide position 1255, causing the alanine (A) at amino acid position 419 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	0.088
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.62
CADD	Benign	6.4
DANN	Benign	0.92
DEOGEN2	Benign	0.0031	T
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.037	N
LIST_S2	Benign	0.29	T
M_CAP	Benign	0.0097	T
MetaRNN	Benign	0.041	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.0	N
MutationTaster	Benign	1.0	N
PROVEAN	Benign	-0.29	N
REVEL	Benign	0.045
Sift	Uncertain	0.012	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.049	B
Vest4		0.053
MutPred		0.22		Gain of phosphorylation at A419 (P = 0.0228);
MVP		0.15
MPC		1.8
ClinPred		0.068	T
GERP RS		-1.5
Varity_R		0.038
gMVP		0.039

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: chr22-17264634;