20-37840168-TG-T

Position:

• chr20-37840168-TG-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_030877.5(CTNNBL1):​c.1281del​(p.Asn428IlefsTer14) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CTNNBL1 NM_030877.5 frameshift
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.58

Genes affected

CTNNBL1 (HGNC:15879): (catenin beta like 1) The protein encoded by this gene is a component of the pre-mRNA-processing factor 19-cell division cycle 5-like (PRP19-CDC5L) protein complex, which activates pre-mRNA splicing and is an integral part of the spliceosome. The encoded protein is also a nuclear localization sequence binding protein, and binds to activation-induced deaminase and is important for antibody diversification. This gene may also be associated with the development of obesity. Alternative splicing results in multiple transcript variants. A pseudogene of this gene has been defined on the X chromosome. [provided by RefSeq, Jul 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CTNNBL1	NM_030877.5	c.1281del	p.Asn428IlefsTer14	frameshift_variant	12/16	ENST00000361383.11
CTNNBL1	NM_001281495.2	c.1200del	p.Asn401IlefsTer14	frameshift_variant	13/17
CTNNBL1	XM_024451947.2	c.1200del	p.Asn401IlefsTer14	frameshift_variant	13/17
CTNNBL1	XM_011528917.3	c.951del	p.Asn318IlefsTer14	frameshift_variant	10/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CTNNBL1	ENST00000361383.11	c.1281del	p.Asn428IlefsTer14	frameshift_variant	12/16	1	NM_030877.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Feb 29, 2024

Variant summary: CTNNBL1 c.1281delG (p.Asn428IlefsX14) results in a premature termination codon, predicted to cause absence of the protein due to nonsense mediated decay, however the molecular mechanism of disease attributed to CTNNBL1 is currently unknown. The variant was absent in 250670 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.1281delG in individuals affected with Immunodeficiency 99 With Hypogammaglobulinemia And Autoimmune Cytopenias and no experimental evidence demonstrating its impact on protein function have been reported. No submitters have cited clinical-significance assessments for this variant to ClinVar. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-36468570;