NM_003190.5:c.1319delG

Variant names:

• chr6-33303970-GC-G
• NM_003190.5:c.1319delG

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The NM_003190.5(TAPBP):​c.1319delG​(p.Cys440SerfsTer34) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: TAPBP NM_003190.5 frameshift
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.416
• Publications: 0 publications found

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: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, Orphanet
• MHC class I deficiency 1

  Inheritance: AR Classification: MODERATE Submitted by: PanelApp Australia

ACMG classification

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

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.0208 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003190.5. 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
	TAPBP	NM_003190.5	MANE Select	c.1319delG	p.Cys440SerfsTer34	frameshift	Exon 7 of 8	NP_003181.3
	TAPBP	NM_172208.3		c.1319delG	p.Cys440SerfsTer40	frameshift	Exon 7 of 7	NP_757345.2	A0A0A0MSV9
	TAPBP	NM_172209.3		c.1058delG	p.Cys353SerfsTer34	frameshift	Exon 6 of 7	NP_757346.2	A0A0A0MT98

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAPBP	ENST00000434618.7	TSL:1 MANE Select	c.1319delG	p.Cys440SerfsTer34	frameshift	Exon 7 of 8	ENSP00000395701.2	O15533-1
	TAPBP	ENST00000426633.6	TSL:1	c.1319delG	p.Cys440SerfsTer40	frameshift	Exon 7 of 7	ENSP00000404833.2	O15533-3
	TAPBP	ENST00000489157.6	TSL:1	c.1058delG	p.Cys353SerfsTer34	frameshift	Exon 6 of 7	ENSP00000419659.1	O15533-4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions

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
PhyloP100		-0.42

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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

hg19: chr6-33271747;