chr6-32840781-C-T

Variant names:

• chr6-32840781-C-T
• rs886061309
• NM_148919.4:c.*178G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_148919.4(PSMB8):​c.*178G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000295 in 474,366 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000030 (0 hom.)
• Consequence: PSMB8 NM_148919.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.143
• Publications: 0 publications found

Genes affected

PSMB8 (HGNC:9545): (proteasome 20S subunit beta 8) 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 3 (proteasome beta 5 subunit) in the immunoproteasome. Proteolytic processing is required to generate a mature subunit. Two alternative transcripts encoding two isoforms have been identified; both isoforms are processed to yield the same mature subunit. [provided by RefSeq, Jul 2008]

PSMB8 Gene-Disease associations (from GenCC):

• proteasome-associated autoinflammatory syndrome 1

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• proteosome-associated autoinflammatory syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_148919.4. 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
	PSMB8	NM_148919.4	MANE Select	c.*178G>A		3_prime_UTR	Exon 6 of 6	NP_683720.2	P28062-1
	PSMB8	NM_004159.5		c.*178G>A		3_prime_UTR	Exon 6 of 6	NP_004150.1	P28062-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PSMB8	ENST00000374882.8	TSL:1 MANE Select	c.*178G>A		3_prime_UTR	Exon 6 of 6	ENSP00000364016.4	P28062-1
	PSMB8	ENST00000374881.3	TSL:1	c.*178G>A		3_prime_UTR	Exon 6 of 6	ENSP00000364015.2	P28062-2
	PSMB8	ENST00000923626.1		c.*178G>A		3_prime_UTR	Exon 6 of 6	ENSP00000593685.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000295 AC: 14 AN: 474366 Hom.: 0 Cov.: 5 AF XY: 0.0000279 AC XY: 7 AN XY: 250914

African (AFR) AF: 0.0000768 AC: 1 AN: 13020

American (AMR) AF: 0.00 AC: 0 AN: 21548

Ashkenazi Jewish (ASJ) AF: 0.000691 AC: 10 AN: 14468

East Asian (EAS) AF: 0.00 AC: 0 AN: 31262

South Asian (SAS) AF: 0.00 AC: 0 AN: 47932

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 34840

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2046

European-Non Finnish (NFE) AF: 0.00000708 AC: 2 AN: 282448

Other (OTH) AF: 0.0000373 AC: 1 AN: 26802

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000189

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Proteasome-associated autoinflammatory syndrome 1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	2.4
DANN	Benign	0.63
PhyloP100		-0.14

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: rs886061309; hg19: chr6-32808558;