chr15-82659567-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_ModerateBS1_Supporting

The NM_001278512.2(AP3B2):c.3299C>T(p.Thr1100Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000196 in 1,613,720 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T1100S) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000092 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00021 ( 0 hom. )

Consequence

AP3B2
NM_001278512.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 5.54

Variant links:

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 links:

CPEB1-AS1 (HGNC:27523): (CPEB1 antisense RNA 1)

CPEB1-AS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.21693698).

BS1

Variant frequency is greater than expected in population nfe. GnomAdExome4 allele frequency = 0.000207 (302/1461554) while in subpopulation NFE AF = 0.000255 (283/1111828). AF 95% confidence interval is 0.00023. There are 0 homozygotes in GnomAdExome4. There are 145 alleles in the male GnomAdExome4 subpopulation. Median coverage is 31. This position FAILED quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AP3B2	NM_001278512.2 link	c.3299C>T	p.Thr1100Ile	missense_variant	Exon 27 of 27	ENST00000535359.6	NP_001265441.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AP3B2	ENST00000535359.6 link	c.3299C>T	p.Thr1100Ile	missense_variant	Exon 27 of 27	1	NM_001278512.2	ENSP00000440984.1		Q13367-4

Frequencies

GnomAD3 genomes

AF:

0.0000920

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000191

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000642

AC:

AN:

249130

AF XY:

0.0000666

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000186

Gnomad NFE exome

AF:

0.000106

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000207

AC:

302

AN:

1461554

Hom.:

Cov.:

AF XY:

0.000199

AC XY:

145

AN XY:

727072

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

AC:

AN:

33480

Gnomad4 AMR exome

AF:

0.00

AC:

AN:

44720

Gnomad4 ASJ exome

AF:

0.00

AC:

AN:

26130

Gnomad4 EAS exome

AF:

0.00

AC:

AN:

39700

Gnomad4 SAS exome

AF:

0.00

AC:

AN:

86258

Gnomad4 FIN exome

AF:

0.000225

AC:

AN:

53302

Gnomad4 NFE exome

AF:

0.000255

AC:

283

AN:

1111828

Gnomad4 Remaining exome

AF:

0.0000994

AC:

AN:

60368

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Exome Het

Variant carriers

100

<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:

0.0000920

AC:

AN:

152166

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74326

show subpopulations

Gnomad4 AFR

AF:

0.00

AC:

AN:

Gnomad4 AMR

AF:

0.00

AC:

AN:

Gnomad4 ASJ

AF:

0.00

AC:

AN:

Gnomad4 EAS

AF:

0.00

AC:

AN:

Gnomad4 SAS

AF:

0.00

AC:

AN:

Gnomad4 FIN

AF:

0.0000942

AC:

0.0000941797

AN:

0.0000941797

Gnomad4 NFE

AF:

0.000191

AC:

0.000191075

AN:

0.000191075

Gnomad4 OTH

AF:

0.00

AC:

AN:

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

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:

0.000106

Hom.:

Bravo

AF:

0.0000756

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000119

AC:

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Aug 09, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 1081 of the AP3B2 protein (p.Thr1081Ile). This variant is present in population databases (rs201428733, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with AP3B2-related conditions. ClinVar contains an entry for this variant (Variation ID: 1394935). 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: "Tolerated"; 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. -

Jul 06, 2023

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports that this missense variant has a deleterious effect on protein structure/function -

Inborn genetic diseases

Uncertain:1

Jan 04, 2022

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.3242C>T (p.T1081I) alteration is located in exon 26 (coding exon 26) of the AP3B2 gene. This alteration results from a C to T substitution at nucleotide position 3242, causing the threonine (T) at amino acid position 1081 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.30

BayesDel_noAF

Benign

-0.36

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.54

.;D;D;.;.

Eigen

Benign

-0.14

Eigen_PC

Benign

-0.13

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.77

T;.;T;T;T

M_CAP

Uncertain

0.089

MetaRNN

Benign

0.22

T;T;T;T;T

MetaSVM

Benign

-0.76

MutationAssessor

Uncertain

2.1

.;M;M;.;.

PrimateAI

Uncertain

0.59

PROVEAN

Uncertain

-3.0

.;D;.;D;D

REVEL

Benign

0.11

Sift

Uncertain

0.0040

.;D;.;D;D

Sift4G

Uncertain

0.0030

.;D;D;D;D

Polyphen

0.0010

.;B;B;.;.

Vest4

0.22, 0.20, 0.32, 0.31

MVP

0.44

MPC

0.14

ClinPred

0.45

GERP RS

1.8

Varity_R

0.11

gMVP

0.23

Mutation Taster

=87/13

polymorphism

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