chr22-28796071-G-A

Position:

chr22-28796071-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_005080.4(XBP1):c.575C>T(p.Ala192Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000421 in 1,614,114 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000099 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000036 ( 0 hom. )

Consequence

XBP1
NM_005080.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.730

Variant links:

Genes affected

XBP1 (HGNC:12801): (X-box binding protein 1) This gene encodes a transcription factor that regulates MHC class II genes by binding to a promoter element referred to as an X box. This gene product is a bZIP protein, which was also identified as a cellular transcription factor that binds to an enhancer in the promoter of the T cell leukemia virus type 1 promoter. It may increase expression of viral proteins by acting as the DNA binding partner of a viral transactivator. It has been found that upon accumulation of unfolded proteins in the endoplasmic reticulum (ER), the mRNA of this gene is processed to an active form by an unconventional splicing mechanism that is mediated by the endonuclease inositol-requiring enzyme 1 (IRE1). The resulting loss of 26 nt from the spliced mRNA causes a frame-shift and an isoform XBP1(S), which is the functionally active transcription factor. The isoform encoded by the unspliced mRNA, XBP1(U), is constitutively expressed, and thought to function as a negative feedback regulator of XBP1(S), which shuts off transcription of target genes during the recovery phase of ER stress. A pseudogene of XBP1 has been identified and localized to chromosome 5. [provided by RefSeq, Jul 2008]

XBP1 links:

XBP1 (HGNC:):

XBP1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.021713734).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	Protein	UniProt
XBP1	NM_005080.4 linkuse as main transcript	c.575C>T	p.Ala192Val	missense_variant	4/5	NP_005071.2	P17861-1A0A024R1F0
XBP1	NM_001394000.1 linkuse as main transcript	c.425C>T	p.Ala142Val	missense_variant	4/5	NP_001380929.1
XBP1	NM_001079539.2 linkuse as main transcript	c.549C>T	p.Gly183Gly	synonymous_variant	5/6	NP_001073007.1	P17861-2
XBP1	NM_001393999.1 linkuse as main transcript	c.399C>T	p.Gly133Gly	synonymous_variant	5/6	NP_001380928.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
XBP1	ENST00000344347.6 linkuse as main transcript	c.549C>T	p.Gly183Gly	synonymous_variant	5/6	5		ENSP00000343155.5		P17861-2

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152152

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000829

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000716

AC:

AN:

251416

Hom.:

AF XY:

0.0000883

AC XY:

AN XY:

135894

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.000392

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000363

AC:

AN:

1461844

Hom.:

Cov.:

AF XY:

0.0000481

AC XY:

AN XY:

727226

show subpopulations

Gnomad4 AFR exome

AF:

0.000149

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000267

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000144

Gnomad4 OTH exome

AF:

0.000132

GnomAD4 genome

AF:

0.0000985

AC:

AN:

152270

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74460

show subpopulations

Gnomad4 AFR

AF:

0.000169

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000830

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000178

Hom.:

Bravo

AF:

0.0000793

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000824

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 28, 2023

The c.575C>T (p.A192V) alteration is located in exon 4 (coding exon 4) of the XBP1 gene. This alteration results from a C to T substitution at nucleotide position 575, causing the alanine (A) at amino acid position 192 to be replaced by a valine (V). 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

0.083

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.26

CADD

Benign

9.0

DANN

Benign

0.81

DEOGEN2

Benign

0.11

T;T;T

Eigen

Benign

-0.88

Eigen_PC

Benign

-0.84

FATHMM_MKL

Benign

0.35

LIST_S2

Benign

0.77

T;T;T

M_CAP

Benign

0.0037

MetaRNN

Benign

0.022

T;T;T

MetaSVM

Benign

-1.1

PrimateAI

Benign

0.23

PROVEAN

Benign

-0.59

N;N;N

REVEL

Benign

0.016

Sift

Benign

0.52

T;T;T

Sift4G

Benign

0.43

T;T;T

Polyphen

0.021

.;.;B

Vest4

0.37

MVP

0.15

MPC

0.30

ClinPred

0.0016

GERP RS

1.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.035

gMVP

0.16

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