rs141373204

Variant names:

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM1BP4_StrongBS1_SupportingBS2

The NM_001875.5(CPS1):c.3643A>G(p.Ile1215Val) variant causes a missense change. The variant allele was found at a frequency of 0.00112 in 1,611,068 control chromosomes in the GnomAD database, including 11 homozygotes. 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 0.0013 ( 2 hom., cov: 28)

Exomes 𝑓: 0.0011 ( 9 hom. )

Consequence

CPS1
NM_001875.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:11B:2

Conservation

PhyloP100: 5.82

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

PM1

In a domain ATP-grasp 2 (size 191) in uniprot entity CPSM_HUMAN there are 29 pathogenic changes around while only 4 benign (88%) in NM_001875.5

BP4

Computational evidence support a benign effect (MetaRNN=0.0088790655).

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.00126 (188/149678) while in subpopulation AMR AF= 0.00235 (35/14884). AF 95% confidence interval is 0.00174. There are 2 homozygotes in gnomad4. There are 82 alleles in male gnomad4 subpopulation. Median coverage is 28. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CPS1	NM_001875.5 link	c.3643A>G	p.Ile1215Val	missense_variant	Exon 30 of 38	ENST00000233072.10	NP_001866.2	P31327-1A0A024R454Q6PEK7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CPS1	ENST00000233072.10 link	c.3643A>G	p.Ile1215Val	missense_variant	Exon 30 of 38	1	NM_001875.5	ENSP00000233072.5		P31327-1

Frequencies

GnomAD3 genomes

AF:

0.00126

AC:

188

AN:

149584

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000124

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00235

Gnomad ASJ

AF:

0.0171

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00169

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.0292

Gnomad NFE

AF:

0.000944

Gnomad OTH

AF:

0.00391

GnomAD3 exomes

AF:

0.00159

AC:

401

AN:

251480

Hom.:

AF XY:

0.00160

AC XY:

218

AN XY:

135914

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.00179

Gnomad ASJ exome

AF:

0.0157

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000751

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00117

Gnomad OTH exome

AF:

0.00342

GnomAD4 exome

AF:

0.00110

AC:

1610

AN:

1461390

Hom.:

Cov.:

AF XY:

0.00115

AC XY:

838

AN XY:

727046

show subpopulations

Gnomad4 AFR exome

AF:

0.000179

Gnomad4 AMR exome

AF:

0.00170

Gnomad4 ASJ exome

AF:

0.0147

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.000638

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000761

Gnomad4 OTH exome

AF:

0.00295

GnomAD4 genome

AF:

0.00126

AC:

188

AN:

149678

Hom.:

Cov.:

AF XY:

0.00113

AC XY:

AN XY:

72814

show subpopulations

Gnomad4 AFR

AF:

0.000123

Gnomad4 AMR

AF:

0.00235

Gnomad4 ASJ

AF:

0.0171

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00170

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000945

Gnomad4 OTH

AF:

0.00388

Alfa

AF:

0.00189

Hom.:

Bravo

AF:

0.00131

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.00104

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00140

AC:

ExAC

AF:

0.00150

AC:

182

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00196

EpiControl

AF:

0.00255

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:11Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Congenital hyperammonemia, type I

Uncertain:5Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 07, 2025	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	New York Genome Center	Mar 12, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Al Jalila Children’s Genomics Center, Al Jalila Childrens Speciality Hospital	May 14, 2020	- -
Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Jun 16, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	May 18, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 27, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

not provided

Uncertain:4

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Aug 01, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jan 01, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	Jan 21, 2016	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Mar 23, 2018	The I1215V variant has been reported previously in a patient with carbamoylphosphate synthetase I (CPS1) deficiency who also harbored a second variant in the CPS1 gene (Kurokawa et al. 2007). The I1215V variant is observed in 31/11564 (0.27%) alleles from individuals of Latino background, in the ExAC dataset including a homozygous individual (Lek et al., 2016). The I1215V variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. This substitution occurs at a position where amino acids with similar properties to Isoleucine and Valine are tolerated across species. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. In summary, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Mar 03, 2022

Variant summary: CPS1 c.3643A>G (p.Ile1215Val) results in a conservative amino acid change located in the Carbamoyl-phosphate synthetase large subunit-like, ATP-binding domain (IPR005479) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0016 in 251480 control chromosomes in the gnomAD database, including 1 homozygote. This frequency is not significantly higher than estimated for a pathogenic variant in CPS1 causing Carbamoylphosphate Synthetase I Deficiency (0.0016 vs 0.0016), allowing no conclusion about variant significance. The variant allele was found at a frequency of 0.0016 in 251480 control chromosomes, predominantly at a frequency of 0.0018 within the Latino subpopulation in the gnomAD database. The observed variant frequency within Latino control individuals in the gnomAD database is approximately 1.14 fold of the estimated maximal expected allele frequency for a pathogenic variant in CPS1 causing Carbamoylphosphate Synthetase I Deficiency phenotype (0.0016), strongly suggesting that the variant is a benign polymorphism found primarily in populations of Latino origin. c.3643A>G has been reported in the literature in at-least one individual affected with Carbamoylphosphate Synthetase I Deficiency (example, Kurokawa_2007). These report(s) do not provide unequivocal conclusions about association of the variant with Carbamoylphosphate Synthetase I Deficiency. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Multiple clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Multiple laboratories reported the variant with conflicting assessments. Based on the evidence outlined above, the variant was classified as VUS-possibly benign. -

Pulmonary hypertension, neonatal, susceptibility to;C4082171:Congenital hyperammonemia, type I

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.016

BayesDel_noAF

Pathogenic

0.19

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.67

.;D;.

Eigen

Uncertain

0.28

Eigen_PC

Uncertain

0.38

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.78

T;T;T

M_CAP

Benign

0.027

MetaRNN

Benign

0.0089

T;T;T

MetaSVM

Uncertain

0.73

MutationAssessor

Benign

1.3

.;L;.

PrimateAI

Benign

0.48

PROVEAN

Benign

-0.81

N;N;N

REVEL

Pathogenic

0.70

Sift

Uncertain

0.012

D;D;D

Sift4G

Uncertain

0.017

D;D;T

Polyphen

0.62

.;P;.

Vest4

0.28

MVP

0.85

MPC

0.20

ClinPred

0.018

GERP RS

4.9

Varity_R

0.58

gMVP

0.71

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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