rs771919381

Variant names:

• chr22-28800373-G-A
• rs771919381
• NM_001079539.2:c.152C>T

Your query was ambiguous. Multiple possible variants found:

• chr22-28800373-G-A
• chr22-28800373-G-T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001079539.2(XBP1):​c.152C>T​(p.Ala51Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000721 in 1,386,692 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A51E) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: XBP1 NM_001079539.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.892
• Publications: 0 publications found

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]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09658128).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001079539.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	XBP1	NM_001079539.2	MANE Select	c.152C>T	p.Ala51Val	missense	Exon 1 of 6	NP_001073007.1	P17861-2
	XBP1	NM_005080.4		c.152C>T	p.Ala51Val	missense	Exon 1 of 5	NP_005071.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	XBP1	ENST00000344347.6	TSL:5 MANE Select	c.152C>T	p.Ala51Val	missense	Exon 1 of 6	ENSP00000343155.5	P17861-2
	XBP1	ENST00000216037.10	TSL:1	c.152C>T	p.Ala51Val	missense	Exon 1 of 5	ENSP00000216037.6	P17861-1
	XBP1	ENST00000933819.1		c.152C>T	p.Ala51Val	missense	Exon 1 of 4	ENSP00000603878.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.21e-7 AC: 1 AN: 1386692 Hom.: 0 Cov.: 31 AF XY: 0.00000146 AC XY: 1 AN XY: 685340

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 28494

American (AMR) AF: 0.00 AC: 0 AN: 35776

Ashkenazi Jewish (ASJ) AF: 0.0000412 AC: 1 AN: 24276

East Asian (EAS) AF: 0.00 AC: 0 AN: 33346

South Asian (SAS) AF: 0.00 AC: 0 AN: 78276

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46348

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5146

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1077692

Other (OTH) AF: 0.00 AC: 0 AN: 57338

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	13
DANN	Uncertain	1.0
DEOGEN2	Benign	0.093	T
Eigen	Benign	-0.76
Eigen_PC	Benign	-0.73
FATHMM_MKL	Benign	0.26	N
LIST_S2	Benign	0.66	T
M_CAP	Pathogenic	0.31	D
MetaRNN	Benign	0.097	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.55	N
PhyloP100		0.89
PrimateAI	Pathogenic	0.87	D
PROVEAN	Benign	-0.74	N
REVEL	Benign	0.027
Sift	Benign	0.24	T
Sift4G	Benign	0.28	T
Polyphen		0.011	B
Vest4		0.030
MutPred		0.11		Loss of relative solvent accessibility (P = 0.0306)
MVP		0.22
MPC		0.30
ClinPred		0.11	T
GERP RS		3.0
PromoterAI		-0.0017	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.2
Varity_R		0.041
gMVP		0.37
Mutation Taster		=88/12	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs771919381; hg19: chr22-29196361; COSMIC: COSV53274680; COSMIC: COSV53274680;