rs886037733

chr14-95126601-ATCTC-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1 PP5_Very_Strong

The NM_177438.3(DICER1):c.878_881del(p.Arg293IlefsTer4) variant causes a frameshift change. Variant has been reported in ClinVar as Pathogenic (★★★). Synonymous variant affecting the same amino acid position (i.e. R293R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: DICER1 NM_177438.3 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:4
• Conservation: PhyloP100: 7.15

Genes affected

DICER1 (HGNC:17098): (dicer 1, ribonuclease III) This gene encodes a protein possessing an RNA helicase motif containing a DEXH box in its amino terminus and an RNA motif in the carboxy terminus. The encoded protein functions as a ribonuclease and is required by the RNA interference and small temporal RNA (stRNA) pathways to produce the active small RNA component that represses gene expression. This protein also acts as a strong antiviral agent with activity against RNA viruses, including the Zika and SARS-CoV-2 viruses. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2021]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 14-95126601-ATCTC-A is Pathogenic according to our data. Variant chr14-95126601-ATCTC-A is described in ClinVar as [Pathogenic]. Clinvar id is 254355.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DICER1	NM_177438.3	c.878_881del	p.Arg293IlefsTer4	frameshift_variant	7/27	ENST00000343455.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DICER1	ENST00000343455.8	c.878_881del	p.Arg293IlefsTer4	frameshift_variant	7/27	1	NM_177438.3	P1

Frequencies

GnomAD3 genomes Cov.: 31

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: reviewed by expert panel

Submissions by phenotype

DICER1-related tumor predisposition Pathogenic:3

Pathogenic, criteria provided, single submitter	curation	Foulkes Cancer Genetics LDI, Lady Davis Institute for Medical Research	Jul 01, 2019	ACMG criteria met: PVS1, PM2, PP1, PP4 -
Pathogenic, criteria provided, single submitter	clinical testing	International Pleuropulmonary Blastoma Registry, Children's Hospitals and Clinics of Minnesota	Nov 10, 2014	- -
Pathogenic, reviewed by expert panel	curation	ClinGen DICER1 and miRNA-Processing Gene Variant Curation Expert Panel, ClinGen	May 18, 2022	The NM_177438.2:c.878_881del (p.Arg293fs) variant in DICER1 is a frameshift variant predicted to cause a premature stop codon in biologically-relevant-exon 7/27 leading to nonsense mediated decay in a gene in which loss-of-function is an established disease mechanism (PVS1). This variant received a total of 1 phenotype point across 1 proband meeting DICER1 VCEP phenotype specificity scoring criteria of 1-1.5 points (PS4_Supporting, PMID: 26925222). This individual was found to have a somatic second hit in a recognized DICER1 hotspot codon on tumor sequencing, which is highly specific for DICER1 syndrome (PP4, PMID: 26925222). This variant is absent from gnomAD v2.1.1 and v3.1.1 (non-cancer) (PM2_Supporting). In summary, this variant meets the criteria to be classified as PATHOGENIC for DICER1 syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen DICER1 VCEP: PVS1, PS4_Supporting, PP4, PM2_Supporting. (Bayesian Points: 11; VCEP specifications version 1; 02/11/2022) -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 09, 2012

This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

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: rs886037733; hg19: chr14-95592938;