chr15-82666761-TC-T

Position:

• chr15-82666761-TC-T

Variant summary

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

The NM_001278512.2(AP3B2):​c.1837del​(p.Glu613SerfsTer182) variant causes a frameshift change involving the alteration of a conserved nucleotide. 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: 33)
• Consequence: AP3B2 NM_001278512.2 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.91

Genes affected

AP3B2 (HGNC:567): (adaptor related protein complex 3 subunit beta 2) Adaptor protein complex 3 (AP-3 complex) is a heterotrimeric protein complex involved in the formation of clathrin-coated synaptic vesicles. The protein encoded by this gene represents the beta subunit of the neuron-specific AP-3 complex and was first identified as the target antigen in human paraneoplastic neurologic disorders. The encoded subunit binds clathrin and is phosphorylated by a casein kinase-like protein, which mediates synaptic vesicle coat assembly. Defects in this gene are a cause of early-onset epileptic encephalopathy. [provided by RefSeq, Feb 2017]

CPEB1-AS1 (HGNC:27523): (CPEB1 antisense RNA 1)

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 15-82666761-TC-T is Pathogenic according to our data. Variant chr15-82666761-TC-T is described in ClinVar as [Pathogenic]. Clinvar id is 374851.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr15-82666761-TC-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AP3B2	NM_001278512.2	c.1837del	p.Glu613SerfsTer182	frameshift_variant	15/27	ENST00000535359.6
CPEB1-AS1	NR_046096.1	n.1328+16617del		intron_variant, non_coding_transcript_variant
AP3B2	NM_004644.5	c.1837del	p.Glu613SerfsTer163	frameshift_variant	15/26
AP3B2	NM_001278511.2	c.1741del	p.Glu581SerfsTer163	frameshift_variant	14/25

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AP3B2	ENST00000535359.6	c.1837del	p.Glu613SerfsTer182	frameshift_variant	15/27	1	NM_001278512.2
CPEB1-AS1	ENST00000560650.1	n.1328+16617del		intron_variant, non_coding_transcript_variant		1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy, 48 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jun 30, 2022	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Nov 10, 2020	- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1057519272; hg19: chr15-83335513;