chr15-23647390-G-A

Position:

• chr15-23647390-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_019066.5(MAGEL2):​c.353C>T​(p.Pro118Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000144 in 1,384,510 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 8/12 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: MAGEL2 NM_019066.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.256

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15470734).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MAGEL2	NM_019066.5	c.353C>T	p.Pro118Leu	missense_variant	1/1	ENST00000650528.1	NP_061939.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MAGEL2	ENST00000650528.1	c.353C>T	p.Pro118Leu	missense_variant	1/1		NM_019066.5	ENSP00000497810	P1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000144 AC: 2 AN: 1384510 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 683200

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000185

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 16, 2019

Not observed in large population cohorts (Lek et al., 2016); Has not been previously published as pathogenic or benign to our knowledge -

Schaaf-Yang syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing;provider interpretation

Geisinger Autism and Developmental Medicine Institute, Geisinger Health System

Aug 29, 2017

This variant was identified in a 4 year old male with developmental delays, autistic behaviors, and a history of seizures. The p.Pro118Leu variant is absent from the gnomAD database. Computational models predict it to be benign. It was inherited from the patient's father who has a mild history of learning problems and depression. Clinical correlation with Schaaf-Yang syndrome was thought to be poor. The MAGEL2 gene is not constrained for missense variation and variants reported in association with Schaaf-Yang syndrome are typically truncating and de novo (Fountain, 2017). Since the this gene is maternally imprinted, testing of paternal grandparents was discussed but has not been completed. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	22
DANN	Benign	0.71
DEOGEN2	Benign	0.12	T;T
FATHMM_MKL	Benign	0.39	N
LIST_S2	Benign	0.52	.;T
MetaRNN	Benign	0.15	T;T
PrimateAI	Uncertain	0.62	T
Sift4G	Uncertain	0.0060	D;.
Vest4		0.21
MVP		0.068
GERP RS		-0.76
Varity_R		0.13
gMVP		0.11

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: rs1131691985; hg19: chr15-23892537;