X-101386057-C-T

Variant names:

• chrX-101386057-C-T
• rs1131691354
• NM_000061.3:c.-31+5G>A

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_000061.3(BTK):​c.-31+5G>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 23)
• Consequence: BTK NM_000061.3 splice_region, intron
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 2.08
• Publications: 0 publications found

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]

BTK Gene-Disease associations (from GenCC):

• Bruton-type agammaglobulinemia

  Inheritance: XL Classification: DEFINITIVE, SUPPORTIVE Submitted by: Myriad Women’s Health, Orphanet, ClinGen
• isolated growth hormone deficiency type III

  Inheritance: XL Classification: STRONG, NO_KNOWN Submitted by: ClinGen, Labcorp Genetics (formerly Invitae)
• short stature due to isolated growth hormone deficiency with X-linked hypogammaglobulinemia

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant X-101386057-C-T is Pathogenic according to our data. Variant chrX-101386057-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 11396.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BTK	NM_000061.3	c.-31+5G>A		splice_region_variant, intron_variant	Intron 1 of 18	ENST00000308731.8	NP_000052.1
BTK	NM_001287344.2	c.72+4421G>A		intron_variant	Intron 1 of 18		NP_001274273.1
BTK	NM_001287345.2	c.-196+5G>A		splice_region_variant, intron_variant	Intron 1 of 16		NP_001274274.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BTK	ENST00000308731.8	c.-31+5G>A		splice_region_variant, intron_variant	Intron 1 of 18	1	NM_000061.3	ENSP00000308176.8

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

X-linked agammaglobulinemia Pathogenic:1

Oct 01, 2001

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.35
CADD	Benign	22
DANN	Benign	0.91
PhyloP100		2.1
PromoterAI		-0.20	Neutral
Mutation Taster		=4/96	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.69		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.69		Position offset: -6
DS_DL_spliceai		0.44		Position offset: 5

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

Other links and lift over

dbSNP: rs1131691354; hg19: chrX-100641045;