8-55102717-T-G

Position:

• chr8-55102717-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_052898.2(XKR4):​c.229T>G​(p.Ser77Ala) 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. 14/21 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: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: XKR4 NM_052898.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.521

Genes affected

XKR4 (HGNC:29394): (XK related 4) Enables phospholipid scramblase activity. Involved in phosphatidylserine exposure on apoptotic cell surface. Predicted to be integral component of membrane. Predicted to be active in plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.109811276).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
XKR4	NM_052898.2	c.229T>G	p.Ser77Ala	missense_variant	1/3	ENST00000327381.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
XKR4	ENST00000327381.7	c.229T>G	p.Ser77Ala	missense_variant	1/3	1	NM_052898.2	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1008786 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 475828

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: 0.00

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

Jul 20, 2021

The c.229T>G (p.S77A) alteration is located in exon 1 (coding exon 1) of the XKR4 gene. This alteration results from a T to G substitution at nucleotide position 229, causing the serine (S) at amino acid position 77 to be replaced by an alanine (A). 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	0.067
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.47
CADD	Benign	13
DANN	Benign	0.34
DEOGEN2	Benign	0.022	T;T
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.010	N
LIST_S2	Benign	0.18	.;T
M_CAP	Pathogenic	0.85	D
MetaRNN	Benign	0.11	T;T
MetaSVM	Benign	-0.76	T
MutationAssessor	Benign	0.0	N;N
MutationTaster	Benign	1.0	N
PrimateAI	Pathogenic	0.88	D
PROVEAN	Benign	-0.19	N;.
REVEL	Benign	0.25
Sift	Benign	0.66	T;.
Sift4G	Benign	0.45	T;T
Polyphen		0.0	B;B
Vest4		0.18
MutPred		0.22		Loss of glycosylation at S77 (P = 0.0027);Loss of glycosylation at S77 (P = 0.0027);
MVP		0.12
MPC		0.53
ClinPred		0.039	T
GERP RS		-0.46
Varity_R		0.046
gMVP		0.073

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: chr8-56015277;