chr15-23644619-G-A

Position:

• chr15-23644619-G-A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_019066.5(MAGEL2):​c.3124C>T​(p.Gln1042*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MAGEL2 NM_019066.5 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 0.617

Genes affected

MAGEL2 (HGNC:6814): (MAGE family member L2) Prader-Willi syndrome (PWS) is caused by the loss of expression of imprinted genes in chromosome 15q11-q13 region. Affected individuals exhibit neonatal hypotonia, developmental delay, and childhood-onset obesity. Necdin (NDN), a gene involved in the terminal differentiation of neurons, localizes to this region of the genome and has been implicated as one of the genes responsible for the etiology of PWS. This gene is structurally similar to NDN, is also localized to the PWS chromosomal region, and is paternally imprinted, suggesting a possible role for it in PWS. [provided by RefSeq, Oct 2010]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.167 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-23644619-G-A is Pathogenic according to our data. Variant chr15-23644619-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 89003.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr15-23644619-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MAGEL2	NM_019066.5	c.3124C>T	p.Gln1042*	stop_gained	1/1	ENST00000650528.1	NP_061939.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MAGEL2	ENST00000650528.1	c.3124C>T	p.Gln1042*	stop_gained	1/1		NM_019066.5	ENSP00000497810.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Schaaf-Yang syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Oct 04, 2013	This nonsense variant is categorized as deleterious according to ACMG guidelines (PMID:18414213) and was found once in our laboratory de novo in a 19-year-old male with intellectual disability, delayed puberty, autism, hearing loss, hypertonia, epilepsy, dysmorphic features, short stature, microcephaly -
Pathogenic, no assertion criteria provided	literature only	OMIM	Nov 01, 2013	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Apr 20, 2023

Please note, this variant is referred to as p.Gln1024* in this publication (Schaaf et al., 2013), which may be a typographic error; Not observed at significant frequency in large population cohorts (gnomAD); Nonsense variant predicted to result in protein truncation, as the last 208 amino acids are lost, and other loss-of-function variants have been reported downstream in HGMD; This variant is associated with the following publications: (PMID: 24076603, 26633545, 24661356) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	38
DANN	Uncertain	1.0
FATHMM_MKL	Benign	0.74	D
Vest4		0.48
GERP RS		3.5

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: rs398122418; hg19: chr15-23889766;