NM_177438.3:c.2507_2508delTC

Variant names:

• chr14-95108021-TGA-T
• rs1060503628
• NM_177438.3:c.2507_2508delTC

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_177438.3(DICER1):​c.2507_2508delTC​(p.Phe836TyrfsTer8) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. F836F) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: DICER1 NM_177438.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.21
• Publications: 1 publications found

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 Gene-Disease associations (from GenCC):

• DICER1-related tumor predisposition

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• pleuropulmonary blastoma

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• DICER1 syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• global developmental delay - lung cysts - overgrowth - Wilms tumor syndrome

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 12 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 14-95108021-TGA-T is Pathogenic according to our data. Variant chr14-95108021-TGA-T is described in ClinVar as Pathogenic. ClinVar VariationId is 412123.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_177438.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DICER1	NM_177438.3	MANE Select	c.2507_2508delTC	p.Phe836TyrfsTer8	frameshift	Exon 16 of 27	NP_803187.1
	DICER1	NM_001271282.3		c.2507_2508delTC	p.Phe836TyrfsTer8	frameshift	Exon 16 of 27	NP_001258211.1
	DICER1	NM_001291628.2		c.2507_2508delTC	p.Phe836TyrfsTer8	frameshift	Exon 16 of 27	NP_001278557.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DICER1	ENST00000343455.8	TSL:1 MANE Select	c.2507_2508delTC	p.Phe836TyrfsTer8	frameshift	Exon 16 of 27	ENSP00000343745.3
	DICER1	ENST00000393063.6	TSL:1	c.2507_2508delTC	p.Phe836TyrfsTer8	frameshift	Exon 18 of 29	ENSP00000376783.1
	DICER1	ENST00000527414.5	TSL:1	c.2507_2508delTC	p.Phe836TyrfsTer8	frameshift	Exon 16 of 27	ENSP00000435681.1

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

DICER1-related tumor predisposition Pathogenic:1

Jul 08, 2016

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change deletes 2 nucleotides from exon 16 of the DICER1 mRNA (c.2507_2508delTC), causing a frameshift at codon 836. This creates a premature translational stop signal (p.Phe836Tyrfs*8) and is expected to result in an absent or disrupted protein product. While this particular variant has not been reported in the literature, loss-of-function variants in DICER1 are known to be pathogenic (PMID: 19556464, 21266384). For these reasons, this variant has been classified as Pathogenic.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.2
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1060503628; hg19: chr14-95574358;