2-15945883-G-T

Variant names:

• chr2-15945883-G-T
• rs104893648
• NM_005378.6:c.1181G>T

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM1 PM2 PM5 PP3_Strong PP5

The NM_005378.6(MYCN):​c.1181G>T​(p.Arg394Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging 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. R394C) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYCN NM_005378.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 8.09

Genes affected

MYCN (HGNC:7559): (MYCN proto-oncogene, bHLH transcription factor) This gene is a member of the MYC family and encodes a protein with a basic helix-loop-helix (bHLH) domain. This protein is located in the nucleus and must dimerize with another bHLH protein in order to bind DNA. Amplification of this gene is associated with a variety of tumors, most notably neuroblastomas. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2014]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PM1: In a domain bHLH (size 52) in uniprot entity MYCN_HUMAN there are 7 pathogenic changes around while only 0 benign (100%) in NM_005378.6
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-15945882-C-T is described in Lovd as [Likely_pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.981
• PP5: Variant 2-15945883-G-T is Pathogenic according to our data. Variant chr2-15945883-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 433153.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYCN	NM_005378.6	c.1181G>T	p.Arg394Leu	missense_variant	Exon 3 of 3	ENST00000281043.4	NP_005369.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYCN	ENST00000281043.4	c.1181G>T	p.Arg394Leu	missense_variant	Exon 3 of 3	5	NM_005378.6	ENSP00000281043.3
MYCN	ENST00000638417.1	c.548G>T	p.Arg183Leu	missense_variant	Exon 2 of 2	2		ENSP00000491476.1
MYCN	ENST00000703162.1	n.530G>T		non_coding_transcript_exon_variant	Exon 2 of 2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Feingold syndrome type 1 Pathogenic:1

Jan 12, 2016

Molecular Diagnostics Lab, Nemours Children's Health, Delaware

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

Dec 23, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt MYCN protein function. ClinVar contains an entry for this variant (Variation ID: 433153). This missense change has been observed in individual(s) with Feingold syndrome (Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces arginine, which is basic and polar, with leucine, which is neutral and non-polar, at codon 394 of the MYCN protein (p.Arg394Leu). This variant disrupts the p.Arg394 amino acid residue in MYCN. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 15821734, 33442900). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.99	D;.
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.80	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.9	H;.
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-6.3	D;.
REVEL	Pathogenic	0.97
Sift	Pathogenic	0.0	D;.
Sift4G	Uncertain	0.0020	D;.
Polyphen		1.0	D;.
Vest4		0.90
MutPred		0.82		Loss of MoRF binding (P = 0.0286);.;
MVP		0.97
MPC		2.1
ClinPred		1.0	D
GERP RS		5.1
Varity_R		0.92
gMVP		0.99

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: rs104893648; hg19: chr2-16086005;