rs121908905

Positions:

• chr5-78181545-T-A
• chr5-78181545-T-C

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_003664.5(AP3B1):​c.904A>T​(p.Arg302Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: AP3B1 NM_003664.5 stop_gained
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 0.488

Genes affected

AP3B1 (HGNC:566): (adaptor related protein complex 3 subunit beta 1) This gene encodes a protein that may play a role in organelle biogenesis associated with melanosomes, platelet dense granules, and lysosomes. The encoded protein is part of the heterotetrameric AP-3 protein complex which interacts with the scaffolding protein clathrin. Mutations in this gene are associated with Hermansky-Pudlak syndrome type 2. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Nov 2012]

ACMG classification

Verdict is Pathogenic. Variant got 11 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 5-78181545-T-A is Pathogenic according to our data. Variant chr5-78181545-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 6376.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr5-78181545-T-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AP3B1	NM_003664.5	c.904A>T	p.Arg302Ter	stop_gained	8/27	ENST00000255194.11	NP_003655.3
AP3B1	NM_001271769.2	c.757A>T	p.Arg253Ter	stop_gained	8/27		NP_001258698.1
AP3B1	NM_001410752.1	c.904A>T	p.Arg302Ter	stop_gained	8/23		NP_001397681.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AP3B1	ENST00000255194.11	c.904A>T	p.Arg302Ter	stop_gained	8/27	1	NM_003664.5	ENSP00000255194	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Hermansky-Pudlak syndrome 2 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jul 01, 2006

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.31
CADD	Pathogenic	35
DANN	Uncertain	0.99
Eigen	Uncertain	0.20
Eigen_PC	Benign	0.0082
FATHMM_MKL	Benign	0.65	D
MutationTaster	Benign	1.0	A;A
Vest4		0.85
GERP RS		-0.65

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: rs121908905; hg19: chr5-77477369;