chr20-10641535-CT-C

Position:

• chr20-10641535-CT-C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000214.3(JAG1):​c.2840del​(p.Lys947SerfsTer23) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: JAG1 NM_000214.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.79

Genes affected

JAG1 (HGNC:6188): (jagged canonical Notch ligand 1) The jagged 1 protein encoded by JAG1 is the human homolog of the Drosophilia jagged protein. Human jagged 1 is the ligand for the receptor notch 1, the latter is involved in signaling processes. Mutations that alter the jagged 1 protein cause Alagille syndrome. Jagged 1 signalling through notch 1 has also been shown to play a role in hematopoiesis. [provided by RefSeq, Nov 2019]

ACMG classification

Verdict is Pathogenic. Variant got 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 20-10641535-CT-C is Pathogenic according to our data. Variant chr20-10641535-CT-C is described in ClinVar as [Pathogenic]. Clinvar id is 406870.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
JAG1	NM_000214.3	c.2840del	p.Lys947SerfsTer23	frameshift_variant	23/26	ENST00000254958.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
JAG1	ENST00000254958.10	c.2840del	p.Lys947SerfsTer23	frameshift_variant	23/26	1	NM_000214.3	P1
JAG1	ENST00000423891.6	n.2706del		non_coding_transcript_exon_variant	21/25	2
JAG1	ENST00000617965.2			downstream_gene_variant		5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Alagille syndrome due to a JAG1 point mutation Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 13, 2016

While this particular variant has not been reported in the literature, loss-of-function variants in JAG1 are known to be pathogenic (PMID: 11180599, 12497640). For these reasons, this variant has been classified as Pathogenic. This sequence change deletes 1 nucleotide from exon 23 of the JAG1 mRNA (c.2840delA), causing a frameshift at codon 947. This creates a premature translational stop signal (p.Lys947Serfs*23) and is expected to result in an absent or disrupted protein product. -

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

LitVar

Other links and lift over

dbSNP: rs1060501349; hg19: chr20-10622183;