Genetic Variant TAP2:p.Ala328Glu (chr6-32832787-G-T) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_001290043.2(TAP2):c.983C>A(p.Ala328Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,598 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A328G) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

TAP2
NM_001290043.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 3.52

Publications

0 publications found

Variant links:

Genes affected

TAP2 (HGNC:44): (transporter 2, ATP binding cassette subfamily B member) The membrane-associated protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance. This gene is located 7 kb telomeric to gene family member ABCB2. The protein encoded by this gene is involved in antigen presentation. This protein forms a heterodimer with ABCB2 in order to transport peptides from the cytoplasm to the endoplasmic reticulum. Mutations in this gene may be associated with ankylosing spondylitis, insulin-dependent diabetes mellitus, and celiac disease. Alternative splicing of this gene produces products which differ in peptide selectivity and level of restoration of surface expression of MHC class I molecules. [provided by RefSeq, Feb 2014]

TAP2 Gene-Disease associations (from GenCC):

MHC class I deficiency
Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen

TAP2 links:

ENSG00000250264 (HGNC:):

ENSG00000250264 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.862

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TAP2	NM_001290043.2 link	c.983C>A	p.Ala328Glu	missense_variant	Exon 6 of 12	ENST00000374897.4	NP_001276972.1
TAP2	NM_018833.3 link	c.983C>A	p.Ala328Glu	missense_variant	Exon 6 of 12		NP_061313.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TAP2	ENST00000374897.4 link	c.983C>A	p.Ala328Glu	missense_variant	Exon 6 of 12	1	NM_001290043.2	ENSP00000364032.3
ENSG00000250264	ENST00000452392.2 link	c.983C>A	p.Ala328Glu	missense_variant	Exon 6 of 15	2		ENSP00000391806.2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460598

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726634

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52142

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112008

Other (OTH)

AF:

0.0000166

AC:

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.58

BayesDel_addAF

Pathogenic

0.31

BayesDel_noAF

Pathogenic

0.20

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.52

.;.;.;D

Eigen

Uncertain

0.61

Eigen_PC

Uncertain

0.46

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.91

D;.;.;.

M_CAP

Uncertain

0.19

MetaRNN

Pathogenic

0.86

D;D;D;D

MetaSVM

Pathogenic

0.98

MutationAssessor

Pathogenic

3.6

.;H;.;H

PhyloP100

3.5

PrimateAI

Uncertain

0.55

PROVEAN

Uncertain

-3.1

D;D;.;D

REVEL

Pathogenic

0.67

Sift

Uncertain

0.0010

D;D;.;D

Sift4G

Uncertain

0.013

.;D;D;D

Polyphen

0.98

.;.;.;D

Vest4

0.59, 0.59

MutPred

0.70

Loss of loop (P = 0.0153);Loss of loop (P = 0.0153);Loss of loop (P = 0.0153);Loss of loop (P = 0.0153);

MVP

0.55

MPC

1.4

ClinPred

0.99

GERP RS

5.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.82

gMVP

0.94

Mutation Taster

=91/9

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over