5-78129275-G-T

Variant names:

• chr5-78129275-G-T
• NM_003664.5:c.1683C>A
• AP3B1 p.Leu561Leu

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_003664.5(AP3B1):​c.1683C>A​(p.Leu561Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as (no stars). Synonymous variant affecting the same amino acid position (i.e. L561L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: AP3B1 NM_003664.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.97
• Publications: 0 publications found

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]

AP3B1 Gene-Disease associations (from GenCC):

• Hermansky-Pudlak syndrome 2

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, G2P, ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.45).
• BP7: Synonymous conserved (PhyloP=2.97 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003664.5. 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
	AP3B1	NM_003664.5	MANE Select	c.1683C>A	p.Leu561Leu	synonymous	Exon 16 of 27	NP_003655.3
	AP3B1	NM_001271769.2		c.1536C>A	p.Leu512Leu	synonymous	Exon 16 of 27	NP_001258698.1	O00203-3
	AP3B1	NM_001410752.1		c.1683C>A	p.Leu561Leu	synonymous	Exon 16 of 23	NP_001397681.1	A0A8Q3SIM7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AP3B1	ENST00000255194.11	TSL:1 MANE Select	c.1683C>A	p.Leu561Leu	synonymous	Exon 16 of 27	ENSP00000255194.7	O00203-1
	AP3B1	ENST00000519295.7	TSL:1	c.1536C>A	p.Leu512Leu	synonymous	Exon 16 of 27	ENSP00000430597.1	O00203-3
	AP3B1	ENST00000913629.1		c.1683C>A	p.Leu561Leu	synonymous	Exon 16 of 27	ENSP00000583688.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.45
CADD	Benign	8.8
DANN	Benign	0.74
PhyloP100		3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.14		Details are displayed if max score is > 0.2

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr5-77425099;