rs142025324

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_003664.5(AP3B1):c.1069A>G(p.Ile357Val) variant causes a missense change. The variant allele was found at a frequency of 0.00185 in 1,612,266 control chromosomes in the GnomAD database, including 10 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0018 ( 1 hom., cov: 32)

Exomes 𝑓: 0.0019 ( 9 hom. )

Consequence

AP3B1
NM_003664.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:10

Conservation

PhyloP100: 5.90

Publications

10 publications found

Variant links:

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, ClinGen, G2P

AP3B1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.029283196).

BP6

Variant 5-78175810-T-C is Benign according to our data. Variant chr5-78175810-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 354243.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00175 (267/152326) while in subpopulation NFE AF = 0.00284 (193/68006). AF 95% confidence interval is 0.00251. There are 1 homozygotes in GnomAd4. There are 147 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 9 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
AP3B1	NM_003664.5 link	c.1069A>G	p.Ile357Val	missense_variant	Exon 10 of 27	ENST00000255194.11	NP_003655.3
AP3B1	NM_001271769.2 link	c.922A>G	p.Ile308Val	missense_variant	Exon 10 of 27		NP_001258698.1
AP3B1	NM_001410752.1 link	c.1069A>G	p.Ile357Val	missense_variant	Exon 10 of 23		NP_001397681.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AP3B1	ENST00000255194.11 link	c.1069A>G	p.Ile357Val	missense_variant	Exon 10 of 27	1	NM_003664.5	ENSP00000255194.7

Frequencies

GnomAD3 genomes

AF:

0.00175

AC:

267

AN:

152208

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000458

Gnomad ASJ

AF:

0.00518

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00377

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00284

Gnomad OTH

AF:

0.000956

GnomAD2 exomes

AF:

0.00168

AC:

421

AN:

251064

AF XY:

0.00166

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000231

Gnomad ASJ exome

AF:

0.00457

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00342

Gnomad NFE exome

AF:

0.00242

Gnomad OTH exome

AF:

0.00262

GnomAD4 exome

AF:

0.00186

AC:

2718

AN:

1459940

Hom.:

Cov.:

AF XY:

0.00183

AC XY:

1332

AN XY:

726364

show subpopulations

African (AFR)

AF:

0.000120

AC:

AN:

33434

American (AMR)

AF:

0.000179

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00506

AC:

132

AN:

26108

East Asian (EAS)

AF:

0.00

AC:

AN:

39560

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86188

European-Finnish (FIN)

AF:

0.00298

AC:

159

AN:

53368

Middle Eastern (MID)

AF:

0.000399

AC:

AN:

5016

European-Non Finnish (NFE)

AF:

0.00207

AC:

2300

AN:

1111282

Other (OTH)

AF:

0.00183

AC:

110

AN:

60266

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.455

Heterozygous variant carriers

131

262

393

524

655

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

144

216

288

360

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00175

AC:

267

AN:

152326

Hom.:

Cov.:

AF XY:

0.00197

AC XY:

147

AN XY:

74504

show subpopulations

African (AFR)

AF:

0.000168

AC:

AN:

41588

American (AMR)

AF:

0.000458

AC:

AN:

15298

Ashkenazi Jewish (ASJ)

AF:

0.00518

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00377

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00284

AC:

193

AN:

68006

Other (OTH)

AF:

0.000946

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00219

Hom.:

Bravo

AF:

0.00124

TwinsUK

AF:

0.00243

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00209

AC:

ExAC

AF:

0.00148

AC:

180

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:10

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hermansky-Pudlak syndrome 2

Uncertain:1Benign:3

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Aug 23, 2022

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant has not been reported in the literature but is present in the Genome Aggregation Database (Highest reported MAF: 0.3% [193/68014], including 1 homozygote; https://gnomad.broadinstitute.org/variant/5-78175810-T-C?dataset=gnomad_r3). Evoluationary conservation and computational predictive tools suggest that this variant may not impact the protein. In summary, data on this variant suggests that this variant does not cause disease but requires further evidence. Therefore, this variant is classified as likely benign. -

Nov 15, 2022

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:research

- -

not provided

Benign:4

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Clinical Genetics, Academic Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Feb 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

not specified

Uncertain:1Benign:1

Oct 25, 2017

Genetic Services Laboratory, University of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 17, 2022

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: AP3B1 c.1069A>G (p.Ile357Val) results in a conservative amino acid change located in the Clathrin/coatomer adaptor, adaptin-like, N-terminal domain (IPR002553) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0017 in 251064 control chromosomes, predominantly at a frequency of 0.0024 within the Non-Finnish European subpopulation in the gnomAD database, including 1 homozygote. The observed variant frequency within Non-Finnish European control individuals in the gnomAD database is approximately 4.8 fold of the estimated maximal expected allele frequency for a pathogenic variant in AP3B1 causing Hermansky-Pudlak Syndrome phenotype (0.0005), strongly suggesting that the variant is a benign polymorphism found primarily in populations of Non-Finnish European origin. To our knowledge, no occurrence of c.1069A>G in individuals affected with Hermansky-Pudlak Syndrome and no experimental evidence demonstrating its impact on protein function have been reported. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation (Likely benign, n=2; VUS, n=2). Based on the evidence outlined above, the variant was classified as likely benign. -

AP3B1-related disorder

Benign:1

Jan 14, 2022

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Autoinflammatory syndrome

Benign:1

Jan 01, 2020

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.077

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.43

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.22

T;.

Eigen

Benign

0.12

Eigen_PC

Benign

0.22

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.85

D;D

M_CAP

Benign

0.011

MetaRNN

Benign

0.029

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.6

L;.

PhyloP100

5.9

PrimateAI

Uncertain

0.74

PROVEAN

Benign

-0.33

N;N

REVEL

Benign

0.12

Sift

Benign

0.22

T;T

Sift4G

Benign

0.23

T;T

Polyphen

0.38

B;.

Vest4

0.86

MVP

0.21

MPC

0.083

ClinPred

0.046

GERP RS

4.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.11

gMVP

0.38

Mutation Taster

=95/5

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over