15-50497165-G-A

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_005154.5(USP8):c.2972G>A(p.Arg991Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000379 in 1,610,730 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: 𝑓 0.000033 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000038 (0 hom.)
• Consequence: USP8 NM_005154.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.67

Genes affected

USP8 (HGNC:12631): (ubiquitin specific peptidase 8) This gene encodes a protein that belongs to the ubiquitin-specific processing protease family of proteins. The encoded protein is thought to regulate the morphology of the endosome by ubiquitination of proteins on this organelle and is involved in cargo sorting and membrane trafficking at the early endosome stage. This protein is required for the cell to enter the S phase of the cell cycle and also functions as a positive regulator in the Hedgehog signaling pathway in development. Pseudogenes of this gene are present on chromosomes 2 and 6. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

USP50 (HGNC:20079): (ubiquitin specific peptidase 50) Enables ubiquitin-like protein-specific protease activity. Acts upstream of or within several processes, including nuclear speck organization; positive regulation of NLRP3 inflammasome complex assembly; and positive regulation of macromolecule metabolic process. Predicted to be active in several cellular components, including dendritic spine; midbody; and postsynaptic density. Predicted to be extrinsic component of endosome membrane and extrinsic component of plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.12463185).
• BS2: High AC in GnomAd at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
USP8	NM_005154.5	c.2972G>A	p.Arg991Gln	missense_variant	18/20	ENST00000307179.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
USP8	ENST00000307179.9	c.2972G>A	p.Arg991Gln	missense_variant	18/20	1	NM_005154.5	P1

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 152172 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000728 AC: 18 AN: 247250 Hom.: 0 AF XY: 0.0000374 AC XY: 5 AN XY: 133732

Gnomad AFR exome AF: 0.0000627

Gnomad AMR exome AF: 0.000391

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000267

Gnomad OTH exome AF: 0.000167

GnomAD4 exome AF: 0.0000384 AC: 56 AN: 1458558 Hom.: 0 Cov.: 30 AF XY: 0.0000317 AC XY: 23 AN XY: 725494

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000317

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000763

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000315

Gnomad4 OTH exome AF: 0.0000664

GnomAD4 genome AF: 0.0000329 AC: 5 AN: 152172 Hom.: 0 Cov.: 33 AF XY: 0.0000404 AC XY: 3 AN XY: 74330

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000132 Hom.: 0

Bravo AF: 0.0000529

ExAC AF: 0.0000576 AC: 7

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spastic paraplegia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Mar 10, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with USP8-related conditions. This variant is present in population databases (rs755050919, ExAC 0.03%). This sequence change replaces arginine with glutamine at codon 991 of the USP8 protein (p.Arg991Gln). The arginine residue is moderately conserved and there is a small physicochemical difference between arginine and glutamine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.40
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Benign	0.055	T;T;.
Eigen	Benign	0.093
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Benign	0.0061	T
MetaRNN	Benign	0.12	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.77	N;N;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-0.15	N;N;N
REVEL	Benign	0.079
Sift	Benign	0.25	T;T;T
Sift4G	Benign	0.49	T;T;T
Polyphen		0.39	B;B;.
Vest4		0.42
MVP		0.47
ClinPred		0.022	T
GERP RS		5.3
Varity_R		0.29
gMVP		0.32

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

LitVar

Other links and lift over

dbSNP: rs755050919; hg19: chr15-50789362; COSMIC: COSV105881309; COSMIC: COSV105881309;