6-32841028-A-T

Variant names:

• chr6-32841028-A-T
• rs369525405
• NM_148919.4:c.762T>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_148919.4(PSMB8):​c.762T>A​(p.Asp254Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,208 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. D254D) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: PSMB8 NM_148919.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.749
• 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: 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=0.08181366).

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.762T>A	p.Asp254Glu	missense	Exon 6 of 6	NP_683720.2	P28062-1
	PSMB8	NM_004159.5		c.750T>A	p.Asp250Glu	missense	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.762T>A	p.Asp254Glu	missense	Exon 6 of 6	ENSP00000364016.4	P28062-1
	PSMB8	ENST00000374881.3	TSL:1	c.750T>A	p.Asp250Glu	missense	Exon 6 of 6	ENSP00000364015.2	P28062-2
	PSMB8	ENST00000923626.1		c.768T>A	p.Asp256Glu	missense	Exon 6 of 6	ENSP00000593685.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460208 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 726504

African (AFR) AF: 0.00 AC: 0 AN: 33446

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.00 AC: 0 AN: 86224

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 9.01e-7 AC: 1 AN: 1110476

Other (OTH) AF: 0.00 AC: 0 AN: 60338

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.47
CADD	Benign	0.26
DANN	Benign	0.71
DEOGEN2	Benign	0.020	T
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.37	N
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.082	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.4	L
PhyloP100		-0.75
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	-0.94	N
REVEL	Benign	0.17
Sift	Benign	0.24	T
Sift4G	Benign	0.43	T
Polyphen		0.0	B
Vest4		0.39
MutPred		0.31		Gain of catalytic residue at W256 (P = 0.0381)
MVP		0.27
MPC		0.52
ClinPred		0.16	T
GERP RS		-8.2
Varity_R		0.67
gMVP		0.81
Mutation Taster		=52/48	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: rs369525405; hg19: chr6-32808805;