rs587780572

chr15-25371710-G-GA

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_130839.5(UBE3A):c.463_464insT(p.Ser155PhefsTer2) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: UBE3A NM_130839.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 6.19

Genes affected

UBE3A (HGNC:12496): (ubiquitin protein ligase E3A) This gene encodes an E3 ubiquitin-protein ligase, part of the ubiquitin protein degradation system. This imprinted gene is maternally expressed in brain and biallelically expressed in other tissues. Maternally inherited deletion of this gene causes Angelman Syndrome, characterized by severe motor and intellectual retardation, ataxia, hypotonia, epilepsy, absence of speech, and characteristic facies. The protein also interacts with the E6 protein of human papillomavirus types 16 and 18, resulting in ubiquitination and proteolysis of tumor protein p53. Alternative splicing of this gene results in three transcript variants encoding three isoforms with different N-termini. Additional transcript variants have been described, but their full length nature has not been determined. [provided by RefSeq, Jul 2008]

SNHG14 (HGNC:37462): (small nucleolar RNA host gene 14) This gene is located within the Prader-Willi critical region and produces a long, spliced paternally-imprinted RNA that initiates within a common upstream promoter region shared by the SNRPN (small nuclear ribonucleoprotein polypeptide N) and SNURF genes. This transcript serves as a host RNA for the small nucleolar RNA, C/D box 115 and 116 clusters. This RNA extends in antisense into the region of the ubiquitin protein ligase E3A gene (UBE3A), and is thought to regulate imprinted expression of UBE3A in the brain. This transcript undergoes extensive alternative splicing, and may initiate and terminate at multiple locations within this genomic region. The full-length structure of all splice forms is not determined. [provided by RefSeq, Mar 2017]

ACMG classification

Verdict is Pathogenic. Variant got 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 15-25371710-G-GA is Pathogenic according to our data. Variant chr15-25371710-G-GA is described in ClinVar as [Pathogenic]. Clinvar id is 136194.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
UBE3A	NM_130839.5	c.463_464insT	p.Ser155PhefsTer2	frameshift_variant	6/13	ENST00000648336.2
SNHG14	NR_146177.1	n.18393-19880dup		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
UBE3A	ENST00000648336.2	c.463_464insT	p.Ser155PhefsTer2	frameshift_variant	6/13		NM_130839.5	P1
SNHG14	ENST00000656420.1	n.5457-47072dup		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Mar 31, 2022	Identified in two alleles out of a cohort of individuals with suspected Angelman syndrome, however, detailed clinical information and familial segregation information were not provided (Sadikovic et al., 2014); Frameshift variant predicted to result in protein truncation or nonsense-mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 29655203, 25212744) -
Pathogenic, no assertion criteria provided	clinical testing	Genetic Services Laboratory, University of Chicago	May 26, 2022	DNA sequence analysis of the UBE3A gene demonstrated a single base pair duplication in exon 4, c.403dup. This sequence change results in an amino acid frameshift and creates a premature stop codon two amino acids downstream of the change, p.Ser135Phefs*2. This sequence change is predicted to result in an abnormal transcript, which may be degraded, or may lead to the production of a truncated UBE3A protein with potentially abnormal function. The c.403dup sequence change has not been described in population databases such as ExAC and gnomAD (dbSNP rs587780572). This sequence change has previously been described in individuals with Angelman syndrome (PMID: 29655203, 25212744). Collectively these evidences indicate this sequence change is pathogenic. -

Angelman syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Baylor Genetics

Feb 14, 2014

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs587780572; hg19: chr15-25616857;