21-44888885-C-A

Variant names:

• chr21-44888885-C-A
• rs2230531
• NM_000211.5:c.1888G>T

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000211.5(ITGB2):​c.1888G>T​(p.Glu630*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000688 in 1,453,020 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: ITGB2 NM_000211.5 stop_gained
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.85
• Publications: 0 publications found

Genes affected

ITGB2 (HGNC:6155): (integrin subunit beta 2) This gene encodes an integrin beta chain, which combines with multiple different alpha chains to form different integrin heterodimers. Integrins are integral cell-surface proteins that participate in cell adhesion as well as cell-surface mediated signalling. The encoded protein plays an important role in immune response and defects in this gene cause leukocyte adhesion deficiency. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

ITGB2 Gene-Disease associations (from GenCC):

• leukocyte adhesion deficiency 1

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 21-44888885-C-A is Pathogenic according to our data. Variant chr21-44888885-C-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3362371.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ITGB2	NM_000211.5	c.1888G>T	p.Glu630*	stop_gained	Exon 14 of 16	ENST00000652462.1	NP_000202.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ITGB2	ENST00000652462.1	c.1888G>T	p.Glu630*	stop_gained	Exon 14 of 16		NM_000211.5	ENSP00000498780.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.88e-7 AC: 1 AN: 1453020 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 723150

African (AFR) AF: 0.00 AC: 0 AN: 33470

American (AMR) AF: 0.00 AC: 0 AN: 44712

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26114

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86232

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 44898

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5756

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111824

Other (OTH) AF: 0.00 AC: 0 AN: 60322

GnomAD4 genome Cov.: 34

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leukocyte adhesion deficiency 1 Pathogenic:1

May 20, 2023

Neuberg Centre For Genomic Medicine, NCGM

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The stop gained variant c.1888G>T(p.Glu630Ter) in the ITGB2 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The variant is absent in the gnomAD Exomes. This variant is predicted to cause loss of normal protein function through protein truncation. Loss of function variants has been previously reported to be disease-causing (van de Vijver et al., 2012). For these reasons, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.53
CADD	Pathogenic	39
DANN	Uncertain	1.0
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Benign	0.53	D
PhyloP100		1.9
Vest4		0.70
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Mutation Taster		=0/200	disease causing (fs/PTC)

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: rs2230531; hg19: chr21-46308800;