rs754818927

Positions:

• chr14-95115704-G-A
• chr14-95115704-G-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The ENST00000343455.8(DICER1):​c.1870C>T​(p.Arg624Ter) variant causes a stop gained 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 (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: DICER1 ENST00000343455.8 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 1.48

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 18 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 14-95115704-G-A is Pathogenic according to our data. Variant chr14-95115704-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 254297.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DICER1	NM_177438.3	c.1870C>T	p.Arg624Ter	stop_gained	11/27	ENST00000343455.8	NP_803187.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DICER1	ENST00000343455.8	c.1870C>T	p.Arg624Ter	stop_gained	11/27	1	NM_177438.3	ENSP00000343745	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251460 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135906

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

DICER1-related tumor predisposition Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 08, 2023	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 254297). This premature translational stop signal has been observed in individuals with pleuropulmonary blastoma and multinodular goiter (PMID: 26925222, 28323992). This variant is present in population databases (rs754818927, gnomAD 0.0009%). This sequence change creates a premature translational stop signal (p.Arg624*) 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	- -
Pathogenic, criteria provided, single submitter	curation	Foulkes Cancer Genetics LDI, Lady Davis Institute for Medical Research	Jul 01, 2019	ACMG criteria met: PVS1, PM2, PM7, PP4 -

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Oct 01, 2022	This nonsense variant causes the premature termination of DICER1 protein synthesis. The frequency of this variant in the general population, 0.000004 (1/251460 chromosomes, http://gnomad.broadinstitute.org), is consistent with pathogenicity. In the published literature, the variant has been reported in individuals affected with pleuropulmonary blastoma (PMID: 26925222 (2015)), ovarian embryonal rhabdomyosarcoma (PMID: 33484847 (2021)), and intracranial sarcoma (PMID: 29881993 (2018), 30989777 (2019), 34913555 (2022)). Based on the available information, this variant is classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	May 02, 2016	- -

Euthyroid goiter Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Dec 30, 2019

This variant was determined to be pathogenic according to ACMG Guidelines, 2015 [PMID:25741868]. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

May 03, 2023

The p.R624* pathogenic mutation (also known as c.1870C>T), located in coding exon 10 of the DICER1 gene, results from a C to T substitution at nucleotide position 1870. This changes the amino acid from an arginine to a stop codon within coding exon 10. This alteration has been reported in individuals diagnosed with pleuropulmonary blastoma, multinodular goiter and intracranial sarcoma with dual chondroid and spindle cell morphology, respectively (Brenneman M et al. F1000Res, 2015 Jul;4:214; Khan NE et al. J. Clin. Endocrinol. Metab., 2017 05;102:1614-1622; Das A et al. Pediatr Blood Cancer, 2019 07;66:e27744). 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. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). 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	0.44
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Benign	0.58	D
MutationTaster	Benign	1.0	A;A;A;A;A
Vest4		0.98
GERP RS		4.2

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: rs754818927; hg19: chr14-95582041; COSMIC: COSV105915817;