rs128621207

Variant names:

• chrX-101353329-G-T
• rs128621207
• NM_000061.3:c.1773C>A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_000061.3(BTK):​c.1773C>A​(p.Tyr591*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: BTK NM_000061.3 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 3.12

Genes affected

BTK (HGNC:1133): (Bruton tyrosine kinase) The protein encoded by this gene plays a crucial role in B-cell development. Mutations in this gene cause X-linked agammaglobulinemia type 1, which is an immunodeficiency characterized by the failure to produce mature B lymphocytes, and associated with a failure of Ig heavy chain rearrangement. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Dec 2013]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 11 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-101353329-G-T is Pathogenic according to our data. Variant chrX-101353329-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 11386.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-101353329-G-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BTK	NM_000061.3	c.1773C>A	p.Tyr591*	stop_gained	Exon 18 of 19	ENST00000308731.8	NP_000052.1
BTK	NM_001287344.2	c.1875C>A	p.Tyr625*	stop_gained	Exon 18 of 19		NP_001274273.1
BTK	NM_001287345.2	c.1245C>A	p.Tyr415*	stop_gained	Exon 16 of 17		NP_001274274.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BTK	ENST00000308731.8	c.1773C>A	p.Tyr591*	stop_gained	Exon 18 of 19	1	NM_000061.3	ENSP00000308176.8

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

X-linked agammaglobulinemia Pathogenic:2

Oct 01, 1994

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Jun 16, 2017

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The c.1773C>A (p.Tyr591*) variant in BTK gene is a nonsense change that results in the loss of the 69 amino acids of NBN (~10%). This change is predicted to cause loss of normal protein function through protein truncation or nonsense-mediated mRNA decay. The variant is absent from control datasets of ExAC or gnomAD. The variant has been reported in at least 1 affected individual with agammaglobulinemia with <1% peripheral B cells and is cited as Pathogenic cited by a reputable database/clinical laboratory. Taking together, the variant was classified as Likely Pathogenic. -

X-linked agammaglobulinemia with growth hormone deficiency Pathogenic:1

Dec 14, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Tyr591*) in the BTK gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in BTK are known to be pathogenic (PMID: 15661032, 16862044, 19419768). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with X-linked recessive agammaglobulinemia (PMID: 7849697). ClinVar contains an entry for this variant (Variation ID: 11386). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	36
DANN	Uncertain	1.0
FATHMM_MKL	Pathogenic	0.99	D
Vest4		0.94
GERP RS		3.8

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

Other links and lift over

dbSNP: rs128621207; hg19: chrX-100608317;