19-2102199-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001261826.3(AP3D1):c.3622A>G(p.Met1208Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000359 in 1,613,960 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000039 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000036 (0 hom.)
• Consequence: AP3D1 NM_001261826.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.808

Genes affected

AP3D1 (HGNC:568): (adaptor related protein complex 3 subunit delta 1) The protein encoded by this gene is a subunit of the AP3 adaptor-like complex, which is not clathrin-associated, but is associated with the golgi region, as well as more peripheral structures. The AP-3 complex facilitates the budding of vesicles from the golgi membrane, and may be directly involved in trafficking to lysosomes. This subunit is implicated in intracellular biogenesis and trafficking of pigment granules, and possibly platelet dense granules and neurotransmitter vesicles. Defects in this gene are a cause of a new type of Hermansky-Pudlak syndrome. [provided by RefSeq, Feb 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.092481494).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AP3D1	NM_001261826.3	c.3622A>G	p.Met1208Val	missense_variant	32/32	ENST00000643116.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AP3D1	ENST00000643116.3	c.3622A>G	p.Met1208Val	missense_variant	32/32		NM_001261826.3	P2

Frequencies

GnomAD3 genomes AF: 0.0000394 AC: 6 AN: 152218 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000241

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: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000522 AC: 13 AN: 249084 Hom.: 0 AF XY: 0.0000444 AC XY: 6 AN XY: 135222

Gnomad AFR exome AF: 0.000129

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000975

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000356 AC: 52 AN: 1461742 Hom.: 0 Cov.: 30 AF XY: 0.0000344 AC XY: 25 AN XY: 727184

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000468

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000394 AC: 6 AN: 152218 Hom.: 0 Cov.: 33 AF XY: 0.0000403 AC XY: 3 AN XY: 74370

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000950 Hom.: 0

Bravo AF: 0.0000453

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000358 AC: 3

ExAC AF: 0.0000744 AC: 9

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 28, 2023

This sequence change replaces methionine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1208 of the AP3D1 protein (p.Met1208Val). This variant is present in population databases (rs199675498, gnomAD 0.009%). This variant has not been reported in the literature in individuals affected with AP3D1-related conditions. ClinVar contains an entry for this variant (Variation ID: 2162097). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.095
BayesDel_addAF	Benign	-0.38	T
BayesDel_noAF	Benign	-0.58
Cadd	Benign	9.2
Dann	Benign	0.70
DEOGEN2	Benign	0.076	T;.;.;.
Eigen	Benign	-0.54
Eigen_PC	Benign	-0.45
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Benign	0.75	T;.;T;T
M_CAP	Benign	0.0034	T
MetaRNN	Benign	0.092	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.81	L;.;.;.
MutationTaster	Benign	0.78	D;D;D;D
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-0.13	N;.;N;.
REVEL	Benign	0.082
Sift	Benign	0.37	T;.;T;.
Sift4G	Benign	0.51	T;.;T;.
Polyphen		0.0	B;B;B;.
Vest4		0.25
MVP		0.18
MPC		0.095
ClinPred		0.017	T
GERP RS		2.3
Varity_R		0.15
gMVP		0.077

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: rs199675498; hg19: chr19-2102198;