dbSNP rs2071888: TAPBP:p.Thr260Ile (chr6-33305078-G-A) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_003190.5(TAPBP):c.779C>T(p.Thr260Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign 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. T260R) has been classified as Benign.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

TAPBP
NM_003190.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.365

Publications

0 publications found

Variant links:

Genes affected

TAPBP (HGNC:11566): (TAP binding protein) This gene encodes a transmembrane glycoprotein which mediates interaction between newly assembled major histocompatibility complex (MHC) class I molecules and the transporter associated with antigen processing (TAP), which is required for the transport of antigenic peptides across the endoplasmic reticulum membrane. This interaction is essential for optimal peptide loading on the MHC class I molecule. Up to four complexes of MHC class I and this protein may be bound to a single TAP molecule. This protein contains a C-terminal double-lysine motif (KKKAE) known to maintain membrane proteins in the endoplasmic reticulum. This gene lies within the major histocompatibility complex on chromosome 6. Alternative splicing results in three transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

TAPBP Gene-Disease associations (from GenCC):

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

TAPBP links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.12958217).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TAPBP	NM_003190.5 link	c.779C>T	p.Thr260Ile	missense_variant	Exon 4 of 8	ENST00000434618.7	NP_003181.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TAPBP	ENST00000434618.7 link	c.779C>T	p.Thr260Ile	missense_variant	Exon 4 of 8	1	NM_003190.5	ENSP00000395701.2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1112010

Other (OTH)

AF:

0.00

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.72

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.035

.;T;.;T

Eigen

Benign

-0.97

Eigen_PC

Benign

-0.89

FATHMM_MKL

Benign

0.14

LIST_S2

Benign

0.35

T;T;T;T

M_CAP

Benign

0.0083

MetaRNN

Benign

0.13

T;T;T;T

MetaSVM

Benign

-1.1

PhyloP100

0.36

PrimateAI

Benign

0.36

PROVEAN

Benign

-2.2

N;N;N;N

REVEL

Benign

0.069

Sift

Benign

0.056

T;T;T;T

Sift4G

Uncertain

0.029

D;D;D;D

Polyphen

0.068

.;B;.;.

Vest4

0.10

MutPred

0.34

.;Loss of glycosylation at T278 (P = 0.0233);.;.;

MVP

0.14

MPC

0.41

ClinPred

0.15

GERP RS

3.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.3

gMVP

0.27

Mutation Taster

=96/4

polymorphism

(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

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over