15-25339090-CTTTTTTT-CTTTTTTTTT

Variant names:

• chr15-25339090-C-CTT
• rs368425414
• NM_130839.5:c.*45_*46dupAA

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_130839.5(UBE3A):​c.*45_*46dupAA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. The gene UBE3A is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: UBE3A NM_130839.5 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.00200
• Publications: 0 publications found

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

Specifications for UBE3A are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_130839.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UBE3A	NM_130839.5	MANE Select	c.*45_*46dupAA		3_prime_UTR	Exon 13 of 13	NP_570854.1	Q05086-3
	UBE3A	NM_000462.5		c.*45_*46dupAA		3_prime_UTR	Exon 14 of 14	NP_000453.2
	UBE3A	NM_001354505.1		c.*45_*46dupAA		3_prime_UTR	Exon 13 of 13	NP_001341434.1	Q05086-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UBE3A	ENST00000648336.2	MANE Select	c.*45_*46dupAA		3_prime_UTR	Exon 13 of 13	ENSP00000497572.2	Q05086-3
	SNHG14	ENST00000424333.6	TSL:1	n.5766+60214_5766+60215dupTT		intron	N/A
	SNHG14	ENST00000554726.2	TSL:1	n.488+60214_488+60215dupTT		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1311462 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 644288

African (AFR) AF: 0.00 AC: 0 AN: 28012

American (AMR) AF: 0.00 AC: 0 AN: 20758

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21570

East Asian (EAS) AF: 0.00 AC: 0 AN: 34136

South Asian (SAS) AF: 0.00 AC: 0 AN: 66814

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 41360

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3704

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1041094

Other (OTH) AF: 0.00 AC: 0 AN: 54014

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.0020
Mutation Taster		=100/0	polymorphism

Splicing

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

Other links and lift over

dbSNP: rs368425414; hg19: chr15-25584237;