6-32850459-G-T

Variant names:

• chr6-32850459-G-T
• rs2127679
• NM_000593.6:c.1109C>A

Variant summary

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

The NM_000593.6(TAP1):​c.1109C>A​(p.Ala370Asp) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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. A370S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TAP1 NM_000593.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.94
• Publications: 0 publications found

Genes affected

TAP1 (HGNC:43): (transporter 1, 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. The protein encoded by this gene is involved in the pumping of degraded cytosolic peptides across the endoplasmic reticulum into the membrane-bound compartment where class I molecules assemble. Mutations in this gene may be associated with ankylosing spondylitis, insulin-dependent diabetes mellitus, and celiac disease. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2014]

PSMB9 (HGNC:9546): (proteasome 20S subunit beta 9) The proteasome is a multicatalytic proteinase complex with a highly ordered ring-shaped 20S core structure. The core structure is composed of 4 rings of 28 non-identical subunits; 2 rings are composed of 7 alpha subunits and 2 rings are composed of 7 beta subunits. Proteasomes are distributed throughout eukaryotic cells at a high concentration and cleave peptides in an ATP/ubiquitin-dependent process in a non-lysosomal pathway. An essential function of a modified proteasome, the immunoproteasome, is the processing of class I MHC peptides. This gene encodes a member of the proteasome B-type family, also known as the T1B family, that is a 20S core beta subunit. This gene is located in the class II region of the MHC (major histocompatibility complex). Expression of this gene is induced by gamma interferon and this gene product replaces catalytic subunit 1 (proteasome beta 6 subunit) in the immunoproteasome. Proteolytic processing is required to generate a mature subunit. [provided by RefSeq, Mar 2010]

PSMB9 Gene-Disease associations (from GenCC):

• proteasome-associated autoinflammatory syndrome 3

  Inheritance: Unknown Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

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: NM_000593.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAP1	NM_000593.6	MANE Select	c.1109C>A	p.Ala370Asp	missense	Exon 5 of 11	NP_000584.3
	TAP1	NM_001292022.2		c.506C>A	p.Ala169Asp	missense	Exon 5 of 11	NP_001278951.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAP1	ENST00000354258.5	TSL:1 MANE Select	c.1109C>A	p.Ala370Asp	missense	Exon 5 of 11	ENSP00000346206.5
	TAP1	ENST00000698423.1		c.1109C>A	p.Ala370Asp	missense	Exon 5 of 12	ENSP00000513711.1
	TAP1	ENST00000920268.1		c.1109C>A	p.Ala370Asp	missense	Exon 5 of 11	ENSP00000590327.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	MHC class I deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.67
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.13
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.39	T
Eigen	Uncertain	0.25
Eigen_PC	Benign	0.22
FATHMM_MKL	Uncertain	0.88	D
M_CAP	Uncertain	0.13	D
MetaRNN	Uncertain	0.65	D
MetaSVM	Uncertain	0.10	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		3.9
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-2.3	N
REVEL	Pathogenic	0.67
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.015	D
Polyphen		0.88	P
Vest4		0.46
MutPred		0.69		Loss of loop (P = 0.0112)
MVP		0.94
MPC		1.6
ClinPred		0.96	D
GERP RS		1.7
Varity_R		0.62
gMVP		0.93
Mutation Taster		=78/22	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

Other links and lift over

dbSNP: rs2127679; hg19: chr6-32818236;