2-231072309-C-A

Position:

• chr2-231072309-C-A

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_002807.4(PSMD1):​c.775C>A​(p.Gln259Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,724 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: PSMD1 NM_002807.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.91

Genes affected

PSMD1 (HGNC:9554): (proteasome 26S subunit, non-ATPase 1) The 26S proteasome is a multicatalytic proteinase complex with a highly ordered structure composed of 2 complexes, a 20S core and a 19S regulator. The 20S core 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. The 19S regulator is composed of a base, which contains 6 ATPase subunits and 2 non-ATPase subunits, and a lid, which contains up to 10 non-ATPase 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 the largest non-ATPase subunit of the 19S regulator lid, which is responsible for substrate recognition and binding. There is evidence that this proteasome and its subunits interact with viral proteins, including those of coronaviruses. Alternatively spliced transcript variants have been found for this gene.[provided by RefSeq, Aug 2020]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• BS2: High AC in GnomAdExome4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PSMD1	NM_002807.4	c.775C>A	p.Gln259Lys	missense_variant	7/25	ENST00000308696.11	NP_002798.2
PSMD1	NM_001191037.2	c.775C>A	p.Gln259Lys	missense_variant	7/24		NP_001177966.1
PSMD1	XM_017004517.3	c.775C>A	p.Gln259Lys	missense_variant	7/18		XP_016860006.1
PSMD1	NR_034059.2	n.764C>A		non_coding_transcript_exon_variant	6/24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PSMD1	ENST00000308696.11	c.775C>A	p.Gln259Lys	missense_variant	7/25	1	NM_002807.4	ENSP00000309474	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461724 Hom.: 0 Cov.: 31 AF XY: 0.00000688 AC XY: 5 AN XY: 727160

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000809

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 13, 2023

The c.775C>A (p.Q259K) alteration is located in exon 7 (coding exon 7) of the PSMD1 gene. This alteration results from a C to A substitution at nucleotide position 775, causing the glutamine (Q) at amino acid position 259 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Benign	0.12	.;T;.;.
Eigen	Benign	0.14
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.92	D;D;.;D
M_CAP	Benign	0.013	T
MetaRNN	Uncertain	0.47	T;T;T;T
MetaSVM	Benign	-0.78	T
MutationAssessor	Benign	1.6	L;L;L;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-1.6	N;N;N;.
REVEL	Benign	0.24
Sift	Benign	0.40	T;T;T;.
Sift4G	Benign	0.44	T;T;T;T
Polyphen		0.0030	B;B;B;.
Vest4		0.68
MutPred		0.41		Gain of methylation at Q259 (P = 0.0148);Gain of methylation at Q259 (P = 0.0148);Gain of methylation at Q259 (P = 0.0148);Gain of methylation at Q259 (P = 0.0148);
MVP		0.79
MPC		0.94
ClinPred		0.90	D
GERP RS		6.0
Varity_R		0.42
gMVP		0.45

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-231937023;