chr4-151014626-T-TTGTCTTCGCTAGC

Variant names:

• chr4-151014626-T-TTGTCTTCGCTAGC
• rs1554020278
• NM_001364905.1:c.4_16dupGCTAGCGAAGACA

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PP5_Moderate

The NM_001364905.1(LRBA):​c.4_16dupGCTAGCGAAGACA​(p.Asn6SerfsTer2) variant causes a frameshift, stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: LRBA NM_001364905.1 frameshift, stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 2.17
• Publications: 0 publications found

Genes affected

LRBA (HGNC:1742): (LPS responsive beige-like anchor protein) The protein encoded by this gene is a member of the WDL-BEACH-WD (WBW) gene family. Its expression is induced in B cells and macrophages by bacterial lipopolysaccharides (LPS). The encoded protein associates with protein kinase A and may be involved in leading intracellular vesicles to activated receptor complexes, which aids in the secretion and/or membrane deposition of immune effector molecules. Defects in this gene are associated with the disorder common variable immunodeficiency-8 with autoimmunity. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2012]

LRBA Gene-Disease associations (from GenCC):

• combined immunodeficiency due to LRBA deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, ClinGen, Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 129 pathogenic variants in the truncated region.
• PP5: Variant 4-151014626-T-TTGTCTTCGCTAGC is Pathogenic according to our data. Variant chr4-151014626-T-TTGTCTTCGCTAGC is described in ClinVar as Pathogenic. ClinVar VariationId is 540378.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LRBA	NM_001364905.1	c.4_16dupGCTAGCGAAGACA	p.Asn6SerfsTer2	frameshift_variant, stop_gained	Exon 2 of 57	ENST00000651943.2	NP_001351834.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LRBA	ENST00000651943.2	c.4_16dupGCTAGCGAAGACA	p.Asn6SerfsTer2	frameshift_variant, stop_gained	Exon 2 of 57		NM_001364905.1	ENSP00000498582.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Combined immunodeficiency due to LRBA deficiency Pathogenic:1

Mar 06, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals with LRBA-related disease. Loss-of-function variants in LRBA are known to be pathogenic (PMID: 26206937, 26768763). For these reasons, this variant has been classified as Pathogenic. This sequence change creates a premature translational stop signal (p.Asn6Serfs*2) in the LRBA gene. It is expected to result in an absent or disrupted protein product. This variant is not present in population databases (ExAC no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.2
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs1554020278; hg19: chr4-151935778;