17-50346202-C-T

Position:

chr17-50346202-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_022167.4(XYLT2):c.62C>T(p.Ala21Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000773 in 1,293,098 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000061 ( 0 hom. )

Consequence

XYLT2
NM_022167.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.51

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 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.39371097).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
XYLT2	NM_022167.4 linkuse as main transcript	c.62C>T	p.Ala21Val	missense_variant	1/11	ENST00000017003.7
XYLT2	NR_110010.2 linkuse as main transcript	n.77C>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.62C>T	p.Ala21Val	missense_variant	1/11	1	NM_022167.4	P1	Q9H1B5-1
XYLT2	ENST00000376550.7 linkuse as main transcript	c.62C>T	p.Ala21Val	missense_variant, NMD_transcript_variant	1/10	1
XYLT2	ENST00000507602.5 linkuse as main transcript	c.62C>T	p.Ala21Val	missense_variant	1/10	2
XYLT2	ENST00000509778.1 linkuse as main transcript	c.62C>T	p.Ala21Val	missense_variant	1/2	3

Frequencies

GnomAD3 genomes

AF:

0.0000203

AC:

AN:

148020

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:

0.0000452

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000611

AC:

AN:

1145078

Hom.:

Cov.:

AF XY:

0.00000709

AC XY:

AN XY:

564482

show subpopulations

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:

0.00000647

Gnomad4 OTH exome

AF:

0.0000239

GnomAD4 genome

AF:

0.0000203

AC:

AN:

148020

Hom.:

Cov.:

AF XY:

0.0000139

AC XY:

AN XY:

72072

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:

0.0000452

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 06, 2022

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 21 of the XYLT2 protein (p.Ala21Val). This variant is present in population databases (no rsID available, gnomAD 0.002%). This variant has not been reported in the literature in individuals affected with XYLT2-related conditions. ClinVar contains an entry for this variant (Variation ID: 1389133). 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: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.32

BayesDel_addAF

Uncertain

0.028

BayesDel_noAF

Benign

-0.20

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.11

T;.;.

Eigen

Uncertain

0.25

Eigen_PC

Benign

0.20

FATHMM_MKL

Uncertain

0.91

LIST_S2

Uncertain

0.92

D;D;D

M_CAP

Pathogenic

0.82

MetaRNN

Benign

0.39

T;T;T

MetaSVM

Benign

-0.71

MutationAssessor

Uncertain

2.2

M;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Pathogenic

0.93

PROVEAN

Benign

-1.3

N;D;N

REVEL

Benign

0.17

Sift

Uncertain

0.0030

D;D;D

Sift4G

Uncertain

0.0070

D;D;D

Polyphen

1.0

D;.;.

Vest4

0.38

MutPred

0.34

Gain of MoRF binding (P = 0.1054);Gain of MoRF binding (P = 0.1054);Gain of MoRF binding (P = 0.1054);

MVP

0.39

MPC

1.2

ClinPred

0.95

GERP RS

3.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.29

gMVP

0.73

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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