Genetic Variant TAP2:p.Ala440Thr (chr6-32830761-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The ENST00000374897.4(TAP2):c.1318G>A(p.Ala440Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. A440S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Consequence

TAP2
ENST00000374897.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.45

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 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000374897.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAP2	NM_001290043.2	MANE Select	c.1318G>A	p.Ala440Thr	missense	Exon 8 of 12	NP_001276972.1
	TAP2	NM_018833.3		c.1318G>A	p.Ala440Thr	missense	Exon 8 of 12	NP_061313.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TAP2	ENST00000374897.4	TSL:1 MANE Select	c.1318G>A	p.Ala440Thr	missense	Exon 8 of 12	ENSP00000364032.3
ENSG00000250264	ENST00000452392.2	TSL:2	c.1318G>A	p.Ala440Thr	missense	Exon 8 of 15	ENSP00000391806.2
TAP2	ENST00000698449.1		c.1351G>A	p.Ala451Thr	missense	Exon 9 of 13	ENSP00000513734.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.24

BayesDel_addAF

Pathogenic

0.21

BayesDel_noAF

Uncertain

0.070

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.37

Eigen

Uncertain

0.42

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.96

M_CAP

Uncertain

0.17

MetaRNN

Uncertain

0.60

MetaSVM

Benign

-0.35

MutationAssessor

Uncertain

2.4

PhyloP100

2.4

PrimateAI

Uncertain

0.55

PROVEAN

Uncertain

-3.2

REVEL

Uncertain

0.47

Sift

Uncertain

0.015

Sift4G

Uncertain

0.0040

Polyphen

1.0

Vest4

0.54

MutPred

0.47

Gain of helix (P = 0.0696)

MVP

0.66

MPC

1.2

ClinPred

0.97

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.15

gMVP

0.67

Mutation Taster

=38/62

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over