rs763801533

Positions:

• chr14-95130072-G-A
• chr14-95130072-G-C
• chr14-95130072-G-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_001395691.1(DICER1):​c.-9C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: DICER1 NM_001395691.1 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 3.55

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]

DICER1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: BayesDel_addAF computational evidence supports a deleterious effect, 0.625
• PP5: Variant 14-95130072-G-A is Pathogenic according to our data. Variant chr14-95130072-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 220676.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr14-95130072-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DICER1	NM_177438.3	c.559C>T	p.Arg187*	stop_gained	5/27	ENST00000343455.8	NP_803187.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DICER1	ENST00000343455.8	c.559C>T	p.Arg187*	stop_gained	5/27	1	NM_177438.3	ENSP00000343745.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

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, PP4 -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 22, 2023	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 220676). This premature translational stop signal has been observed in individual(s) with pleuropulmonary blastoma (PMID: 24909177, 26925222). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Arg187*) in the DICER1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in DICER1 are known to be pathogenic (PMID: 19556464, 21266384). -
Pathogenic, criteria provided, single submitter	clinical testing	International Pleuropulmonary Blastoma Registry, Children's Hospitals and Clinics of Minnesota	Nov 10, 2014	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Jun 06, 2024

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 33460435, 26925222, 34257391, 24909177) -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 30, 2023

The p.R187* pathogenic mutation (also known as c.559C>T), located in coding exon 4 of the DICER1 gene, results from a C to T substitution at nucleotide position 559. This changes the amino acid from an arginine to a stop codon within coding exon 4. This alteration has been identified in a child with a diagnosis of pleuropulmonary blastoma (Brenneman M et al. F1000Res, 2015 Jul;4:214). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). In addition to the clinical data presented in the literature, 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

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Pathogenic	0.83
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Uncertain	0.94	D
Vest4		0.97
GERP RS		4.8

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: rs763801533; hg19: chr14-95596409; COSMIC: COSV58628166; COSMIC: COSV58628166;