chr6-32845587-G-A

Variant names:

• chr6-32845587-G-A
• rs1323970381
• NM_000593.6:c.2239C>T
• TAP1 p.Pro747Ser

GermlineCancer (beta)

Variant summary

Our verdict is Uncertain significance.

+1 Uncertain · Cold

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 1 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_ModerateB3_Supporting

The NM_000593.6(TAP1):c.2239C>T (p.Pro747Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a cumulative frequency of 0.000000685 (AC=1) in the gnomAD database across 1,460,764 control chromosomes (no homozygotes observed). The grpmax filtering allele frequency (95% CI) is 0.000000899. In-silico predictor (REVEL) classifies this variant as likely benign. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain Significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TAP1 NM_000593.6 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.668
• 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]

TAP1 Gene-Disease associations (from GenCC):

• MHC class I deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics
• MHC class I deficiency 1

  Inheritance: AR Classification: STRONG Submitted by: G2P, PanelApp Australia

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 6

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
• proteasome-associated autoinflammatory syndrome 3

  Inheritance: Unknown Classification: LIMITED Submitted by: Ambry Genetics

PSMB8-AS1 (HGNC:39758): ()

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Uncertain_significance. The variant received 1 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O3Absent or very rare in population		Absent or extremely rare in gnomAD (AC ≤ 2) — O3 moderate; GnomAD: AF = 0.000001, AC = 1 — absent/extremely rare (O3 moderate [+2])
	B3Computational evidence does not support deleterious effect		Computational evidence does not support a deleterious effect; Missense variant — primary computational scorer does not support an oncogenic/deleterious effect; supports B3

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_000593.6. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	TAP1 NM_000593.6	MANE Select	c.2239C>T p.Pro747Ser	missense	Exon 11 of 11	Prot: NP_000584.3
	TAP1 NM_001292022.2		c.1636C>T p.Pro546Ser	missense	Exon 11 of 11	Prot: NP_001278951.1
	PSMB8-AS1 NR_037173.1		n.585G>A	non_coding_transcript_exon	Exon 3 of 3	Prot:

TAP1 NM_000593.6

MANE Select

HGVSc / HGVSpc.2239C>Tp.Pro747Ser

Exon rankExon 11 of 11

missense

Prot: NP_000584.3

TAP1 NM_001292022.2

HGVSc / HGVSpc.1636C>Tp.Pro546Ser

Exon rankExon 11 of 11

missense

Prot: NP_001278951.1

PSMB8-AS1 NR_037173.1

HGVSc / HGVSpn.585G>A

Exon rankExon 3 of 3

non_coding_transcript_exon

Prot:

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	TAP1 ENST00000354258.5	TSL:1MANE Select	c.2239C>T p.Pro747Ser	missense	Exon 11 of 11	Prot: ENSP00000346206.5 UniProt:
	TAP1 ENST00000920268.1		c.2251C>T p.Pro751Ser	missense	Exon 11 of 11	Prot: ENSP00000590327.1 UniProt:
	TAP1 ENST00000875705.1		c.2221C>T p.Pro741Ser	missense	Exon 11 of 11	Prot: ENSP00000545764.1 UniProt:

TAP1 ENST00000354258.5

TSL:1MANE Select

HGVSc / HGVSpc.2239C>Tp.Pro747Ser

Exon rankExon 11 of 11

missense

Prot: ENSP00000346206.5UniProt: Q03518-1

TAP1 ENST00000920268.1

HGVSc / HGVSpc.2251C>Tp.Pro751Ser

Exon rankExon 11 of 11

missense

Prot: ENSP00000590327.1UniProt: A0ACI8T119

TAP1 ENST00000875705.1

HGVSc / HGVSpc.2221C>Tp.Pro741Ser

Exon rankExon 11 of 11

missense

Prot: ENSP00000545764.1UniProt: A0ACI8QHR4

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 4 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:32
GnomAD2 exomes	AF: 0.00000406	AC:1	Hom:	AN:246562	Cov:
GnomAD4 exome	AF: 6.85e-7	AC:1	Hom:0	AN:1460764	Cov:31
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:32

Showing 4 sources

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Inborn genetic diseases (1)
-	1	-	not specified (1)

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Uncertain	14
AlphaMissense	Benign	0.067
BayesDel_addAF	Benign	-0.041	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	17
DANN	Benign	0.92
DEOGEN2	Benign	0.015	T
Eigen	Benign	-0.82
Eigen_PC	Benign	-0.81
FATHMM_MKL	Benign	0.063	N
FuncVEP CTI	Benign	0.0053
GPN-Star LLR	N/A	-2.5
GPN-Star score	N/A	2.5
LIST_S2	Benign	0.58	T
M_CAP	Benign	0.069	D
MetaRNN	Benign	0.086	T
MetaSVM	Benign	-0.73	T
Mutation Taster	N/A	95/5	polymorphism
MutationAssessor	Benign	0.49	N
PhyloP100	Benign	0.67
popEVE	Benign	-3.3
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.52	N
REVEL	Benign	0.18
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.027	D
Varity_R	N/A	0.022
VESM-3B	Benign	-3.0

Showing 28 of 28 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.010
SpliceAI score (max)	Benign	0.0	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs1323970381;

hg19: chr6-32813364;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar