20-45891598-CCTGCTGCTGCTGCTGCTGCTGCTGCT-CCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCT

Variant names:

• chr20-45891598-C-CCTGCTGCTGCTGCTG
• rs72555383
• NM_000308.4:c.42_56dupGCTGCTGCTGCTGCT

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP3

The NM_000308.4(CTSA):​c.42_56dupGCTGCTGCTGCTGCT​(p.Leu15_Leu19dup) variant causes a disruptive inframe insertion change involving the alteration of a non-conserved nucleotide. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. L19L) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 0)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: CTSA NM_000308.4 disruptive_inframe_insertion
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.48
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• galactosialidosis

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp, Illumina, G2P

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• BP3: Nonframeshift variant in repetitive region in NM_000308.4

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000308.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CTSA	NM_000308.4	MANE Select	c.42_56dupGCTGCTGCTGCTGCT	p.Leu15_Leu19dup	disruptive_inframe_insertion	Exon 2 of 15	NP_000299.3	P10619-1
	CTSA	NM_001127695.3		c.42_56dupGCTGCTGCTGCTGCT	p.Leu15_Leu19dup	disruptive_inframe_insertion	Exon 2 of 15	NP_001121167.1	P10619-1
	CTSA	NM_001167594.3		c.42_56dupGCTGCTGCTGCTGCT	p.Leu15_Leu19dup	disruptive_inframe_insertion	Exon 2 of 14	NP_001161066.2	P10619-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CTSA	ENST00000646241.3	MANE Select	c.42_56dupGCTGCTGCTGCTGCT	p.Leu15_Leu19dup	disruptive_inframe_insertion	Exon 2 of 15	ENSP00000493613.2	P10619-1
	CTSA	ENST00000372484.8	TSL:1	c.96_110dupGCTGCTGCTGCTGCT	p.Leu33_Leu37dup	disruptive_inframe_insertion	Exon 2 of 15	ENSP00000361562.3	X6R8A1
	CTSA	ENST00000191018.9	TSL:1	c.42_56dupGCTGCTGCTGCTGCT	p.Leu15_Leu19dup	disruptive_inframe_insertion	Exon 2 of 15	ENSP00000191018.5	P10619-1

Frequencies

GnomAD3 genomes Cov.: 0

GnomAD4 exome AF: 0.00000279 AC: 4 AN: 1432032 Hom.: 0 Cov.: 0 AF XY: 0.00000140 AC XY: 1 AN XY: 712840

African (AFR) AF: 0.00 AC: 0 AN: 32872

American (AMR) AF: 0.0000229 AC: 1 AN: 43594

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25792

East Asian (EAS) AF: 0.00 AC: 0 AN: 39148

South Asian (SAS) AF: 0.00 AC: 0 AN: 84808

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46974

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5688

European-Non Finnish (NFE) AF: 0.00000274 AC: 3 AN: 1093902

Other (OTH) AF: 0.00 AC: 0 AN: 59254

GnomAD4 genome Cov.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.5

Splicing

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

Other links and lift over

dbSNP: rs72555383; hg19: chr20-44520237;