17-50346174-C-T

Position:

chr17-50346174-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4BS1_Supporting

The NM_022167.4(XYLT2):c.34C>T(p.Arg12Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000284 in 1,285,680 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00031 ( 1 hom. )

Consequence

XYLT2
NM_022167.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 2.64

Variant links:

Genes affected

XYLT2 (HGNC:15517): (xylosyltransferase 2) The protein encoded by this gene is an isoform of xylosyltransferase, which belongs to a family of glycosyltransferases. This enzyme transfers xylose from UDP-xylose to specific serine residues of the core protein and initiates the biosynthesis of glycosaminoglycan chains in proteoglycans including chondroitin sulfate, heparan sulfate, heparin and dermatan sulfate. The enzyme activity, which is increased in scleroderma patients, is a diagnostic marker for the determination of sclerotic activity in systemic sclerosis. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Dec 2013]

XYLT2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.36619794).

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.000306 (348/1137716) while in subpopulation NFE AF= 0.000369 (341/924608). AF 95% confidence interval is 0.000336. There are 1 homozygotes in gnomad4_exome. There are 154 alleles in male gnomad4_exome subpopulation. Median coverage is 30. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
XYLT2	NM_022167.4 linkuse as main transcript	c.34C>T	p.Arg12Trp	missense_variant	1/11	ENST00000017003.7
XYLT2	NR_110010.2 linkuse as main transcript	n.49C>T		non_coding_transcript_exon_variant	1/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
XYLT2	ENST00000017003.7 linkuse as main transcript	c.34C>T	p.Arg12Trp	missense_variant	1/11	1	NM_022167.4	P1	Q9H1B5-1
XYLT2	ENST00000376550.7 linkuse as main transcript	c.34C>T	p.Arg12Trp	missense_variant, NMD_transcript_variant	1/10	1
XYLT2	ENST00000507602.5 linkuse as main transcript	c.34C>T	p.Arg12Trp	missense_variant	1/10	2
XYLT2	ENST00000509778.1 linkuse as main transcript	c.34C>T	p.Arg12Trp	missense_variant	1/2	3

Frequencies

GnomAD3 genomes

AF:

0.000115

AC:

AN:

147964

Hom.:

Cov.:

show subpopulations

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:

0.000241

Gnomad OTH

AF:

0.000490

GnomAD3 exomes

AF:

0.000168

AC:

AN:

83260

Hom.:

AF XY:

0.000235

AC XY:

AN XY:

46900

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000468

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000306

AC:

348

AN:

1137716

Hom.:

Cov.:

AF XY:

0.000275

AC XY:

154

AN XY:

560524

show subpopulations

Gnomad4 AFR exome

AF:

0.0000912

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:

0.000369

Gnomad4 OTH exome

AF:

0.000121

GnomAD4 genome

AF:

0.000115

AC:

AN:

147964

Hom.:

Cov.:

AF XY:

0.000153

AC XY:

AN XY:

72026

show subpopulations

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:

0.000241

Gnomad4 OTH

AF:

0.000490

Alfa

AF:

0.0000584

Hom.:

Bravo

AF:

0.000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 30, 2021	This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 12 of the XYLT2 protein (p.Arg12Trp). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with XYLT2-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 04, 2023

The c.34C>T (p.R12W) alteration is located in exon 1 (coding exon 1) of the XYLT2 gene. This alteration results from a C to T substitution at nucleotide position 34, causing the arginine (R) at amino acid position 12 to be replaced by a tryptophan (W). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

XYLT2-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 09, 2024

The XYLT2 c.34C>T variant is predicted to result in the amino acid substitution p.Arg12Trp. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.037% of alleles in individuals of European (Non-Finnish) descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

-0.020

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.17

T;.;.

Eigen

Benign

0.18

Eigen_PC

Benign

0.11

FATHMM_MKL

Uncertain

0.85

LIST_S2

Uncertain

0.94

D;D;D

M_CAP

Pathogenic

0.93

MetaRNN

Benign

0.37

T;T;T

MetaSVM

Benign

-0.51

MutationAssessor

Uncertain

2.3

M;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Pathogenic

0.96

PROVEAN

Uncertain

-3.2

D;D;D

REVEL

Uncertain

0.39

Sift

Uncertain

0.0060

D;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

1.0

D;.;.

Vest4

0.36

MVP

0.41

MPC

1.3

ClinPred

0.64

GERP RS

2.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.50

gMVP

0.66

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over