rs886044220

Positions:

• chr20-10649058-T-C
• chr20-10649058-T-G

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2 PP3 PP5_Very_Strong

The NM_000214.3(JAG1):​c.1395+3A>G variant causes a splice donor 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. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: JAG1 NM_000214.3 splice_donor_region, intron
• Scores: Splicing: ADA: 0.9991
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 3.47

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 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. Scorers claiming Uncertain: max_spliceai. No scorers claiming Benign.
• PP5: Variant 20-10649058-T-C is Pathogenic according to our data. Variant chr20-10649058-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 289599.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr20-10649058-T-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
JAG1	NM_000214.3	c.1395+3A>G		splice_donor_region_variant, intron_variant		ENST00000254958.10	NP_000205.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
JAG1	ENST00000254958.10	c.1395+3A>G		splice_donor_region_variant, intron_variant		1	NM_000214.3	ENSP00000254958	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Alagille syndrome due to a JAG1 point mutation Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 07, 2023	This sequence change falls in intron 11 of the JAG1 gene. It does not directly change the encoded amino acid sequence of the JAG1 protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or disrupted protein product. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with Alagille syndrome (PMID: 10220506, 11058898, 24748328). In at least one individual the variant was observed to be de novo. It has also been observed to segregate with disease in related individuals. This variant is also known as c.1808+3A>G. ClinVar contains an entry for this variant (Variation ID: 289599). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant results in aberrant splicing of exon 11 and introduces a premature termination codon (PMID: 11058898). The resulting mRNA is expected to undergo nonsense-mediated decay. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, no assertion criteria provided	research	Genomics And Bioinformatics Analysis Resource, Columbia University	-	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jul 18, 2016

- -

Tetralogy of Fallot Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Nov 02, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.39
CADD	Uncertain	24
DANN	Benign	0.95
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.97
SpliceAI score (max)		0.26		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.26		Position offset: 3

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

Publications

LitVar

Other links and lift over

dbSNP: rs886044220; hg19: chr20-10629706;