chr2-210556606-G-A

Position:

• chr2-210556606-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001875.5(CPS1):​c.-128G>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00646 in 1,507,982 control chromosomes in the GnomAD database, including 42 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0047 (3 hom., cov: 32)
  • Exomes 𝑓: 0.0067 (39 hom.)
• Consequence: CPS1 NM_001875.5 5_prime_UTR
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -1.15

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 2-210556606-G-A is Benign according to our data. Variant chr2-210556606-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 334005.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00472 (718/152032) while in subpopulation NFE AF= 0.00698 (474/67930). AF 95% confidence interval is 0.00646. There are 3 homozygotes in gnomad4. There are 365 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CPS1	NM_001875.5	c.-128G>A		5_prime_UTR_variant	1/38	ENST00000233072.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CPS1	ENST00000233072.10	c.-128G>A		5_prime_UTR_variant	1/38	1	NM_001875.5	P1

Frequencies

GnomAD3 genomes AF: 0.00473 AC: 718 AN: 151914 Hom.: 3 Cov.: 32

Gnomad AFR AF: 0.00109

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00414

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00269

Gnomad FIN AF: 0.0110

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00698

Gnomad OTH AF: 0.00287

GnomAD4 exome AF: 0.00666 AC: 9026 AN: 1355950 Hom.: 39 Cov.: 31 AF XY: 0.00645 AC XY: 4294 AN XY: 665838

Gnomad4 AFR exome AF: 0.000910

Gnomad4 AMR exome AF: 0.00249

Gnomad4 ASJ exome AF: 0.0000921

Gnomad4 EAS exome AF: 0.0000277

Gnomad4 SAS exome AF: 0.00439

Gnomad4 FIN exome AF: 0.0108

Gnomad4 NFE exome AF: 0.00731

Gnomad4 OTH exome AF: 0.00615

GnomAD4 genome AF: 0.00472 AC: 718 AN: 152032 Hom.: 3 Cov.: 32 AF XY: 0.00491 AC XY: 365 AN XY: 74336

Gnomad4 AFR AF: 0.00108

Gnomad4 AMR AF: 0.00414

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00269

Gnomad4 FIN AF: 0.0110

Gnomad4 NFE AF: 0.00698

Gnomad4 OTH AF: 0.00284

Alfa AF: 0.00598 Hom.: 1

Bravo AF: 0.00423

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jan 16, 2019

- -

Congenital hyperammonemia, type I Benign:1

Likely benign, 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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.21
DANN	Benign	0.38

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

Publications

LitVar

Other links and lift over

dbSNP: rs182021022; hg19: chr2-211421330; COSMIC: COSV99028199; COSMIC: COSV99028199;