rs746164022

chr14-95096654-C-Achr14-95096654-C-Gchr14-95096654-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 3P and 5B. PM2 PP2 BP4_Strong BP6

The NM_177438.3(DICER1):c.4266G>T(p.Glu1422Asp) variant causes a missense 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. 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). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E1422A) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: DICER1 NM_177438.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: -3.17

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, DICER1
• BP4: Computational evidence support a benign effect (MetaRNN=0.061186373).
• BP6: Variant 14-95096654-C-A is Benign according to our data. Variant chr14-95096654-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 477197.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DICER1	NM_177438.3	c.4266G>T	p.Glu1422Asp	missense_variant	23/27	ENST00000343455.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DICER1	ENST00000343455.8	c.4266G>T	p.Glu1422Asp	missense_variant	23/27	1	NM_177438.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000405 AC: 1 AN: 246644 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 133566

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: 0.00000907

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

DICER1-related tumor predisposition Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 18, 2023

This sequence change replaces glutamic acid, which is acidic and polar, with aspartic acid, which is acidic and polar, at codon 1422 of the DICER1 protein (p.Glu1422Asp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DICER1-related conditions. ClinVar contains an entry for this variant (Variation ID: 477197). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The aspartic acid amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Hereditary cancer-predisposing syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 31, 2024

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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.068
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.38
Cadd	Benign	0.052
Dann	Benign	0.96
DEOGEN2	Benign	0.23	T;T;T;T;.;.
Eigen	Benign	-0.97
Eigen_PC	Benign	-0.93
FATHMM_MKL	Benign	0.17	N
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.061	T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.76	N;N;N;N;.;N
MutationTaster	Benign	0.97	D;D;D;D;D;D
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.20	N;N;N;N;N;N
REVEL	Benign	0.067
Sift	Benign	0.31	T;T;T;T;T;T
Sift4G	Benign	0.50	T;T;T;T;T;T
Polyphen		0.0	B;B;B;B;.;.
Vest4		0.12
MutPred		0.42		Gain of glycosylation at S1426 (P = 0.2369);Gain of glycosylation at S1426 (P = 0.2369);Gain of glycosylation at S1426 (P = 0.2369);Gain of glycosylation at S1426 (P = 0.2369);.;Gain of glycosylation at S1426 (P = 0.2369);
MVP		0.63
MPC		0.45
ClinPred		0.071	T
GERP RS		-3.1
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.8
Varity_R		0.034
gMVP		0.14

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: rs746164022; hg19: chr14-95562991;