rs1057519269

Positions:

• chr15-82679729-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP5

The NM_001278512.2(AP3B2):​c.1182G>A​(p.Lys394Lys) variant causes a splice region, synonymous change. The variant allele was found at a frequency of 0.00000205 in 1,461,272 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: AP3B2 NM_001278512.2 splice_region, synonymous
• Scores: Splicing: ADA: 0.9995
• Clinical Significance: Pathogenic/Likely pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 5.01

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]

AP3B2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-82679729-C-T is Pathogenic according to our data. Variant chr15-82679729-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 374846.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AP3B2	NM_001278512.2	c.1182G>A	p.Lys394Lys	splice_region_variant, synonymous_variant	10/27	ENST00000535359.6	NP_001265441.1
AP3B2	NM_004644.5	c.1182G>A	p.Lys394Lys	splice_region_variant, synonymous_variant	10/26		NP_004635.2
AP3B2	NM_001278511.2	c.1086G>A	p.Lys362Lys	splice_region_variant, synonymous_variant	9/25		NP_001265440.1
CPEB1-AS1	NR_046096.1	n.1329-12282C>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AP3B2	ENST00000535359.6	c.1182G>A	p.Lys394Lys	splice_region_variant, synonymous_variant	10/27	1	NM_001278512.2	ENSP00000440984.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461272 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726952

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: 0.00000180

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Epileptic encephalopathy Pathogenic:1

Likely pathogenic, no assertion criteria provided

clinical testing

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

-

- -

Developmental and epileptic encephalopathy, 48 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Nov 19, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.22
CADD	Benign	21
DANN	Benign	0.90

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.85
SpliceAI score (max)		0.040		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: rs1057519269; hg19: chr15-83348481;