Genetic Variant NM_005154.5:c.2159C>T (chr15-50490450-C-T) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PM5

The NM_005154.5(USP8):c.2159C>T(p.Pro720Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P720R) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

USP8
NM_005154.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.82

Publications

25 publications found

Variant links:

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]

USP8 Gene-Disease associations (from GenCC):

autosomal recessive spastic paraplegia type 59
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
complex neurodevelopmental disorder
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
genetic developmental and epileptic encephalopathy
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
hereditary spastic paraplegia
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

USP8 links:

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ACMG classification

Classification was made for transcript

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

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr15-50490450-C-G is described in ClinVar as Pathogenic. ClinVar VariationId is 161995.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
USP8	NM_005154.5 link	c.2159C>T	p.Pro720Leu	missense_variant	Exon 14 of 20	ENST00000307179.9	NP_005145.3	P40818-1A0A024R5S4A8K8N5
USP8	NM_001128610.3 link	c.2159C>T	p.Pro720Leu	missense_variant	Exon 14 of 20		NP_001122082.1	P40818-1A0A024R5S4
USP8	NM_001283049.2 link	c.1841C>T	p.Pro614Leu	missense_variant	Exon 11 of 17		NP_001269978.1	P40818-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
USP8	ENST00000307179.9 link	c.2159C>T	p.Pro720Leu	missense_variant	Exon 14 of 20	1	NM_005154.5	ENSP00000302239.4		P40818-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727244

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112008

Other (OTH)

AF:

0.00

AC:

AN:

60396

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.93

BayesDel_addAF

Uncertain

0.044

BayesDel_noAF

Benign

-0.17

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.49

T;T;.

Eigen

Pathogenic

0.73

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.97

.;D;D

M_CAP

Benign

0.037

MetaRNN

Uncertain

0.48

T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.0

M;M;.

PhyloP100

5.8

PrimateAI

Uncertain

0.78

PROVEAN

Pathogenic

-5.6

D;D;D

REVEL

Benign

0.28

Sift

Pathogenic

0.0

D;D;D

Sift4G

Uncertain

0.056

T;T;T

Polyphen

1.0

D;D;.

Vest4

0.64

MutPred

0.17

Gain of MoRF binding (P = 0.046);Gain of MoRF binding (P = 0.046);.;

MVP

0.26

ClinPred

0.99

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.80

gMVP

0.64

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over