rs141832130

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 1P and 5B. PP3BS1_SupportingBS2

The NM_003664.5(AP3B1):c.1022G>A(p.Arg341His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000466 in 1,613,062 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00023 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00049 ( 3 hom. )

Consequence

AP3B1
NM_003664.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 7.57

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.789

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00023 (35/152120) while in subpopulation NFE AF= 0.000324 (22/68002). AF 95% confidence interval is 0.000218. There are 0 homozygotes in gnomad4. There are 12 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AP3B1	NM_003664.5 link	c.1022G>A	p.Arg341His	missense_variant	Exon 9 of 27	ENST00000255194.11	NP_003655.3	O00203-1A0A0S2Z5J4
AP3B1	NM_001271769.2 link	c.875G>A	p.Arg292His	missense_variant	Exon 9 of 27		NP_001258698.1	O00203-3A0A0S2Z5J4
AP3B1	NM_001410752.1 link	c.1022G>A	p.Arg341His	missense_variant	Exon 9 of 23		NP_001397681.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AP3B1	ENST00000255194.11 link	c.1022G>A	p.Arg341His	missense_variant	Exon 9 of 27	1	NM_003664.5	ENSP00000255194.7		O00203-1

Frequencies

GnomAD3 genomes

AF:

0.000230

AC:

AN:

152002

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000197

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000189

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000323

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000223

AC:

AN:

251320

Hom.:

AF XY:

0.000206

AC XY:

AN XY:

135816

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.000202

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000396

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000490

AC:

716

AN:

1460942

Hom.:

Cov.:

AF XY:

0.000466

AC XY:

339

AN XY:

726808

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.000246

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000375

Gnomad4 NFE exome

AF:

0.000602

Gnomad4 OTH exome

AF:

0.000497

GnomAD4 genome

AF:

0.000230

AC:

AN:

152120

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

AN XY:

74388

show subpopulations

Gnomad4 AFR

AF:

0.000193

Gnomad4 AMR

AF:

0.000197

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000189

Gnomad4 NFE

AF:

0.000324

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000357

Hom.:

Bravo

AF:

0.000227

TwinsUK

AF:

0.00108

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000698

AC:

ExAC

AF:

0.000272

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.000237

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hermansky-Pudlak syndrome 2

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago	Mar 30, 2021	AP3B1 NM_003664.4 exon 9 p.Arg341His (c.1022G>A): This variant has not been reported in the literature but is present in 0.03% (49/129098) of European alleles in the Genome Aggregation Database (https://gnomad.broadinstitute.org/variant/5-77473181-C-T?dataset=gnomad_r2_1). This variant is present in ClinVar (Variation ID:533468). Evolutionary conservation and computational predictive tools suggest that this variant may impact the protein. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain. -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 21, 2022	This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 341 of the AP3B1 protein (p.Arg341His). This variant is present in population databases (rs141832130, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with AP3B1-related conditions. ClinVar contains an entry for this variant (Variation ID: 533468). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, no assertion criteria provided	research	ISTH-SSC Genomics in Thrombosis and Hemostasis, KU Leuven, Center for Molecular and Vascular Biology	-	- -

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Sep 27, 2021	- -
Uncertain significance, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Uncertain significance, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Sep 16, 2024

Variant summary: AP3B1 c.1022G>A (p.Arg341His) results in a non-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 damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00022 in 251320 control chromosomes, predominantly at a frequency of 0.0004 within the Non-Finnish European subpopulation in the gnomAD database. This frequency is not significantly higher than estimated for a pathogenic variant in AP3B1 causing Hermansky-Pudlak Syndrome (0.00022 vs 0.0005), allowing no conclusion about variant significance. c.1022G>A has been reported in the literature in one individual affected with NK/T-cell lymphoma of nasal type (example, Guan_2021). These report(s) do not provide unequivocal conclusions about association of the variant with Hermansky-Pudlak Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication has been ascertained in the context of this evaluation (PMID: 34170459). ClinVar contains an entry for this variant (Variation ID: 533468). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.88

BayesDel_addAF

Uncertain

0.055

BayesDel_noAF

Pathogenic

0.16

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.55

D;.

Eigen

Pathogenic

0.91

Eigen_PC

Pathogenic

0.86

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.92

D;D

M_CAP

Uncertain

0.13

MetaRNN

Pathogenic

0.79

D;D

MetaSVM

Benign

-0.41

MutationAssessor

Pathogenic

3.3

M;.

PrimateAI

Uncertain

0.73

PROVEAN

Pathogenic

-4.4

D;D

REVEL

Pathogenic

0.66

Sift

Uncertain

0.014

D;D

Sift4G

Uncertain

0.0050

D;D

Polyphen

1.0

D;.

Vest4

0.87

MVP

0.70

MPC

0.19

ClinPred

0.81

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.44

gMVP

0.55

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over