20-45891622-G-C

Position:

chr20-45891622-G-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_ModerateBP6BP7

The NM_000308.4(CTSA):c.54G>C(p.Leu18Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000134 in 1,489,396 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0000071 ( 0 hom., cov: 32)

Exomes 𝑓: 7.4e-7 ( 0 hom. )

Consequence

CTSA
NM_000308.4 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4

Conservation

PhyloP100: 2.74

Variant links:

Genes affected

CTSA (HGNC:9251): (cathepsin A) This gene encodes a member of the peptidase S10 family of serine carboxypeptidases. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed to generate two chains that comprise the heterodimeric active enzyme. This enzyme possesses deamidase, esterase and carboxypeptidase activities and acts as a scaffold in the lysosomal multienzyme complex. Mutations in this gene are associated with galactosialidosis. [provided by RefSeq, Nov 2015]

CTSA links:

CTSA (HGNC:):

CTSA links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.4).

BP6

Variant 20-45891622-G-C is Benign according to our data. Variant chr20-45891622-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 459632.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=1}.

BP7

Synonymous conserved (PhyloP=2.74 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CTSA	NM_000308.4 linkuse as main transcript	c.54G>C	p.Leu18Leu	synonymous_variant	2/15	ENST00000646241.3	NP_000299.3	P10619-1X6R8A1
CTSA	NM_001127695.3 linkuse as main transcript	c.54G>C	p.Leu18Leu	synonymous_variant	2/15		NP_001121167.1	P10619-1
CTSA	NM_001167594.3 linkuse as main transcript	c.54G>C	p.Leu18Leu	synonymous_variant	2/14		NP_001161066.2	P10619-2B4E324X6R5C5
CTSA	NR_133656.2 linkuse as main transcript	n.99G>C		non_coding_transcript_exon_variant	2/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CTSA	ENST00000646241.3 linkuse as main transcript	c.54G>C	p.Leu18Leu	synonymous_variant	2/15		NM_000308.4	ENSP00000493613.2		P10619-1

Frequencies

GnomAD3 genomes

AF:

0.00000709

AC:

AN:

141032

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000268

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00164

AC:

388

AN:

237212

Hom.:

AF XY:

0.00141

AC XY:

184

AN XY:

130084

show subpopulations

Gnomad AFR exome

AF:

0.000884

Gnomad AMR exome

AF:

0.00350

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00848

Gnomad SAS exome

AF:

0.00106

Gnomad FIN exome

AF:

0.00339

Gnomad NFE exome

AF:

0.000140

Gnomad OTH exome

AF:

0.000341

GnomAD4 exome

AF:

7.42e-7

AC:

AN:

1348256

Hom.:

Cov.:

AF XY:

0.00000149

AC XY:

AN XY:

672514

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000342

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000709

AC:

AN:

141140

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

68342

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000268

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000114

Hom.:

Bravo

AF:

0.0155

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Benign:3

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Sep 08, 2020	- -
Likely benign, no assertion criteria provided	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Dec 15, 2015	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Nov 01, 2024	CTSA: BP4, BP7 -

Combined deficiency of sialidase AND beta galactosidase

Uncertain:1Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 01, 2024	- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.40

CADD

Benign

DANN

Benign

0.92

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over