rs1553517122

Variant names:

• chr2-210647903-CA-C
• rs1553517122
• NM_001875.5:c.3185delA

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_001875.5(CPS1):​c.3185delA​(p.Asn1062ThrfsTer38) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CPS1 NM_001875.5 frameshift
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 0.229
• Publications: 0 publications found

Genes affected

CPS1 (HGNC:2323): (carbamoyl-phosphate synthase 1) The mitochondrial enzyme encoded by this gene catalyzes synthesis of carbamoyl phosphate from ammonia and bicarbonate. This reaction is the first committed step of the urea cycle, which is important in the removal of excess urea from cells. The encoded protein may also represent a core mitochondrial nucleoid protein. Three transcript variants encoding different isoforms have been found for this gene. The shortest isoform may not be localized to the mitochondrion. Mutations in this gene have been associated with carbamoyl phosphate synthetase deficiency, susceptibility to persistent pulmonary hypertension, and susceptibility to venoocclusive disease after bone marrow transplantation.[provided by RefSeq, May 2010]

CPS1 Gene-Disease associations (from GenCC):

• carbamoyl phosphate synthetase I deficiency disease

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Myriad Women’s Health, Orphanet, G2P

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-210647903-CA-C is Pathogenic according to our data. Variant chr2-210647903-CA-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 555324.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001875.5. 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
	CPS1	NM_001875.5	MANE Select	c.3185delA	p.Asn1062ThrfsTer38	frameshift	Exon 26 of 38	NP_001866.2
	CPS1	NM_001369256.1		c.3218delA	p.Asn1073ThrfsTer38	frameshift	Exon 27 of 39	NP_001356185.1
	CPS1	NM_001122633.3		c.3185delA	p.Asn1062ThrfsTer38	frameshift	Exon 27 of 39	NP_001116105.2	P31327-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CPS1	ENST00000233072.10	TSL:1 MANE Select	c.3185delA	p.Asn1062ThrfsTer38	frameshift	Exon 26 of 38	ENSP00000233072.5	P31327-1
	CPS1	ENST00000430249.7	TSL:1	c.3203delA	p.Asn1068ThrfsTer38	frameshift	Exon 27 of 39	ENSP00000402608.2	P31327-3
	CPS1	ENST00000451903.3	TSL:1	c.1832delA	p.Asn611ThrfsTer38	frameshift	Exon 16 of 28	ENSP00000406136.2	P31327-2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Congenital hyperammonemia, type I (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.23
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1553517122; hg19: chr2-211512627;