Genetic Variant MEG3:n.3121+4522C>T (chr14-100850055-C-T) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBP6

The NR_046473.1(MEG3):n.5439C>T variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00163 in 152,136 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (no stars).

Frequency

Genomes: 𝑓 0.0016 ( 0 hom., cov: 33)

Failed GnomAD Quality Control

Consequence

MEG3
NR_046473.1 non_coding_transcript_exon

Scores

Clinical Significance

Likely benign no assertion criteria provided B:1

Conservation

PhyloP100: 0.190

Variant links:

Genes affected

MEG3 (HGNC:14575): (maternally expressed 3) This gene is a maternally expressed imprinted gene. Multiple alternatively spliced transcript variants have been transcribed from this gene and all of them are long non-coding RNAs (lncRNAs). This gene is expressed in many normal tissues, but its expression is lost in multiple cancer cell lines of various tissue origins. It inhibits tumor cell proliferation in vitro. It also interacts with the tumor suppressor p53, and regulates p53 target gene expression. Its deletion enhances angiogenesis in vivo. Many experimental evidences demonstrate that this gene is a lncRNA tumor suppressor. [provided by RefSeq, Mar 2012]

MEG3 links:

ENSG00000258663 (HGNC:):

ENSG00000258663 links:

MIR493HG (HGNC:55978): (MIR493 cluster host gene)

MIR493HG links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.62).

BP6

Variant 14-100850055-C-T is Benign according to our data. Variant chr14-100850055-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 3041128.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank
MEG3	NR_046473.1 link	n.5439C>T	non_coding_transcript_exon_variant	Exon 7 of 7
MEG3	NR_190994.1 link	n.5549C>T	non_coding_transcript_exon_variant	Exon 8 of 8
MEG3	NR_190995.1 link	n.5679C>T	non_coding_transcript_exon_variant	Exon 9 of 9

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL
MEG3	ENST00000398461.5 link	n.3121+4522C>T	intron_variant	Intron 3 of 3	1
MEG3	ENST00000429159.6 link	n.1275+4522C>T	intron_variant	Intron 6 of 6	1
MEG3	ENST00000451743.6 link	n.1241+4522C>T	intron_variant	Intron 6 of 6	1

Frequencies

GnomAD3 genomes

AF:

0.00163

AC:

248

AN:

152018

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000580

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000852

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000962

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000284

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00296

Gnomad OTH

AF:

0.000956

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AC:

AN:

Hom.:

Cov.:

AC XY:

AN XY:

GnomAD4 genome

AF:

0.00163

AC:

248

AN:

152136

Hom.:

Cov.:

AF XY:

0.00152

AC XY:

113

AN XY:

74364

show subpopulations

Gnomad4 AFR

AF:

0.000578

Gnomad4 AMR

AF:

0.000851

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000965

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000284

Gnomad4 NFE

AF:

0.00296

Gnomad4 OTH

AF:

0.000946

Alfa

AF:

0.00164

Hom.:

Bravo

AF:

0.00172

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

MEG3-related disorder

Benign:1

Jul 31, 2023

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.62

CADD

Benign

8.8

DANN

Benign

0.91

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over