rs766492523

Positions:

• chr14-95115779-T-C

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 1P and 9B. PP2 BP4_Strong BP6 BS2

The NM_177438.3(DICER1):​c.1795A>G​(p.Thr599Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000752 in 1,461,848 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. T599T) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: DICER1 NM_177438.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4 B:2
• Conservation: PhyloP100: 0.811

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 Benign. Variant got -8 ACMG points.

• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), DICER1. . Gene score misZ 4.2261 (greater than the threshold 3.09). Trascript score misZ 6.1353 (greater than threshold 3.09). GenCC has associacion of gene with goiter, multinodular 1, with or without Sertoli-Leydig cell tumors, global developmental delay - lung cysts - overgrowth - Wilms tumor syndrome, DICER1-related tumor predisposition, DICER1 syndrome, pleuropulmonary blastoma.
• BP4: Computational evidence support a benign effect (MetaRNN=0.040598184).
• BP6: Variant 14-95115779-T-C is Benign according to our data. Variant chr14-95115779-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 543564.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=4, Likely_benign=2}.
• BS2: High AC in GnomAdExome4 at 11 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DICER1	NM_177438.3	c.1795A>G	p.Thr599Ala	missense_variant	11/27	ENST00000343455.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DICER1	ENST00000343455.8	c.1795A>G	p.Thr599Ala	missense_variant	11/27	1	NM_177438.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000318 AC: 8 AN: 251478 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135912

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000202

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 AF: 0.00000752 AC: 11 AN: 1461848 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 727234

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000134

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

ExAC AF: 0.0000247 AC: 3

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Feb 16, 2023	The frequency of this variant in the general population, 0.0002 (7/34588 chromosomes, http://gnomad.broadinstitute.org), is uninformative in assessment of its pathogenicity. In the published literature, the variant has been reported in an individual with pleuropulmonary blastoma (PMID: 33718253 (2021)). Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is benign. Based on the available information, we are unable to determine the clinical significance of this variant. -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jan 10, 2023	In silico analysis supports that this missense variant does not alter protein structure/function; Observed in an individual with thyroid cancer (Canberk et al., 2021); This variant is associated with the following publications: (PMID: 33718253) -

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	curation	Sema4, Sema4	Mar 08, 2022	- -
Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Oct 23, 2018	This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

DICER1-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Jan 30, 2023

The DICER1 c.1795A>G variant is predicted to result in the amino acid substitution p.Thr599Ala. This variant has been reported as a germline variant in an individual with papillary thyroid carcinoma (Canberk et al. 2021. PubMed ID: 33718253). This variant is reported in 0.020% of alleles in individuals of Latino descent in gnomAD (http://gnomad.broadinstitute.org/variant/14-95582116-T-C) and in ClinVar this variant has conflicting interpretations of likely benign and uncertain (https://www.ncbi.nlm.nih.gov/clinvar/variation/543564/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

DICER1-related tumor predisposition Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 29, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.061
BayesDel_addAF	Benign	-0.49	T
BayesDel_noAF	Benign	-0.66
CADD	Benign	9.6
DANN	Benign	0.22
DEOGEN2	Benign	0.27	T;T;T;T;.
Eigen	Benign	-1.1
Eigen_PC	Benign	-0.97
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.30	.;.;T;.;T
M_CAP	Benign	0.0076	T
MetaRNN	Benign	0.041	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-1.0	N;N;N;N;N
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-0.35	N;N;N;N;N
REVEL	Benign	0.034
Sift	Benign	0.72	T;T;T;T;T
Sift4G	Benign	0.86	T;T;T;T;T
Polyphen		0.0	B;B;B;B;.
Vest4		0.15
MutPred		0.25		Loss of phosphorylation at T599 (P = 0.0302);Loss of phosphorylation at T599 (P = 0.0302);Loss of phosphorylation at T599 (P = 0.0302);Loss of phosphorylation at T599 (P = 0.0302);Loss of phosphorylation at T599 (P = 0.0302);
MVP		0.36
MPC		0.48
ClinPred		0.0067	T
GERP RS		-0.20
Varity_R		0.019
gMVP		0.36

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: rs766492523; hg19: chr14-95582116;