NM_001334.3:c.862C>T

Variant names:

• chr4-155928405-G-A
• rs773065737
• NM_001334.3:c.862C>T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001334.3(CTSO):​c.862C>T​(p.Arg288Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000416 in 1,612,034 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R288Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000039 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000042 (0 hom.)
• Consequence: CTSO NM_001334.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.53
• Publications: 1 publications found

Genes affected

CTSO (HGNC:2542): (cathepsin O) The protein encoded by the gene is a cysteine proteinase and a member of the papain superfamily. This proteolytic enzyme is involved in cellular protein degradation and turnover. The recombinant form of this enzyme was shown to degrade synthetic peptides typically used as substrates for cysteine proteinases and its proteolytic activity was abolished by an inhibitor of cyteine proteinase. [provided by RefSeq, Jul 2008]

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.863

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CTSO	NM_001334.3	c.862C>T	p.Arg288Trp	missense_variant	Exon 7 of 8	ENST00000433477.4	NP_001325.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CTSO	ENST00000433477.4	c.862C>T	p.Arg288Trp	missense_variant	Exon 7 of 8	1	NM_001334.3	ENSP00000414904.3

Frequencies

GnomAD3 genomes AF: 0.0000395 AC: 6 AN: 152012 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000967

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

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

GnomAD2 exomes AF: 0.0000439 AC: 11 AN: 250606 AF XY: 0.0000443

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000873

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000353

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000418 AC: 61 AN: 1460022 Hom.: 0 Cov.: 30 AF XY: 0.0000344 AC XY: 25 AN XY: 726328

African (AFR) AF: 0.0000599 AC: 2 AN: 33396

American (AMR) AF: 0.0000897 AC: 4 AN: 44598

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26086

East Asian (EAS) AF: 0.0000253 AC: 1 AN: 39556

South Asian (SAS) AF: 0.0000465 AC: 4 AN: 86054

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53382

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5758

European-Non Finnish (NFE) AF: 0.0000450 AC: 50 AN: 1110872

Other (OTH) AF: 0.00 AC: 0 AN: 60320

GnomAD4 genome AF: 0.0000395 AC: 6 AN: 152012 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74244

African (AFR) AF: 0.0000967 AC: 4 AN: 41356

American (AMR) AF: 0.0000655 AC: 1 AN: 15266

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4818

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10578

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68018

Other (OTH) AF: 0.00 AC: 0 AN: 2088

Alfa AF: 0.0000329 Hom.: 0

Bravo AF: 0.0000227

ExAC AF: 0.0000412 AC: 5

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.0000548

EpiControl AF: 0.0000595

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Feb 24, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.862C>T (p.R288W) alteration is located in exon 7 (coding exon 7) of the CTSO gene. This alteration results from a C to T substitution at nucleotide position 862, causing the arginine (R) at amino acid position 288 to be replaced by a tryptophan (W). 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	Uncertain	0.34
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.18
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.89	D
Eigen	Uncertain	0.27
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Uncertain	-0.28	T
MutationAssessor	Uncertain	2.9	M
PhyloP100		3.5
PrimateAI	Benign	0.40	T
PROVEAN	Pathogenic	-6.4	D
REVEL	Uncertain	0.38
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.64
MVP		0.49
MPC		0.35
ClinPred		0.93	D
GERP RS		2.9
Varity_R		0.66
gMVP		0.77
Mutation Taster		=87/13	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs773065737; hg19: chr4-156849557; COSMIC: COSV105352186;