rs370595480

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1PM2PP3_StrongPP5_Very_Strong

The NM_054012.4(ASS1):c.805G>A(p.Val269Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000613 in 1,614,048 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000061 ( 0 hom. )

Consequence

ASS1
NM_054012.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:6U:2

Conservation

PhyloP100: 9.26

Variant links:

Genes affected

ASS1 (HGNC:758): (argininosuccinate synthase 1) The protein encoded by this gene catalyzes the penultimate step of the arginine biosynthetic pathway. There are approximately 10 to 14 copies of this gene including the pseudogenes scattered across the human genome, among which the one located on chromosome 9 appears to be the only functional gene for argininosuccinate synthetase. Mutations in the chromosome 9 copy of this gene cause citrullinemia. Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Aug 2012]

ASS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PM1

In a strand (size 6) in uniprot entity ASSY_HUMAN there are 8 pathogenic changes around while only 0 benign (100%) in NM_054012.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.943

PP5

Variant 9-130480416-G-A is Pathogenic according to our data. Variant chr9-130480416-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 193968.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-130480416-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ASS1	NM_054012.4 link	c.805G>A	p.Val269Met	missense_variant	Exon 11 of 15	ENST00000352480.10	NP_446464.1	P00966Q5T6L4
ASS1	NM_000050.4 link	c.805G>A	p.Val269Met	missense_variant	Exon 12 of 16		NP_000041.2	P00966Q5T6L4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ASS1	ENST00000352480.10 link	c.805G>A	p.Val269Met	missense_variant	Exon 11 of 15	1	NM_054012.4	ENSP00000253004.6		P00966

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152228

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000517

AC:

AN:

251314

Hom.:

AF XY:

0.0000663

AC XY:

AN XY:

135838

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000968

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000609

AC:

AN:

1461820

Hom.:

Cov.:

AF XY:

0.0000660

AC XY:

AN XY:

727206

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000755

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152228

Hom.:

Cov.:

AF XY:

0.0000941

AC XY:

AN XY:

74382

show subpopulations

Gnomad4 AFR

AF:

0.0000965

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000781

Hom.:

Bravo

AF:

0.0000529

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000576

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:6Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Citrullinemia type I

Pathogenic:3Uncertain:1

Jan 04, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 13, 2017

Genetic Services Laboratory, University of Chicago

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 23, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 18, 2017

Counsyl

Significance: Uncertain significance

Review Status: flagged submission

Collection Method: clinical testing

- -

Citrullinemia

Pathogenic:2

Jan 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 269 of the ASS1 protein (p.Val269Met). This variant is present in population databases (rs370595480, gnomAD 0.01%). This missense change has been observed in individual(s) with mild citrullinemia type 1 (PMID: 12815590, 14680976; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 193968). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ASS1 protein function. For these reasons, this variant has been classified as Pathogenic. -

Jun 02, 2022

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

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ASS1 c.805G>A (p.Val269Met) results in a conservative amino acid change in 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 5.2e-05 in 251314 control chromosomes. This frequency is not significantly higher than expected for a pathogenic variant in ASS1 causing Citrullinemia Type I (5.2e-05 vs 0.0041), allowing no conclusion about variant significance. c.805G>A has been reported in the literature in individuals affected with citrullinemia or urea cycle disorders. These data indicate that the variant may be associated with disease. At least one publication reports experimental evidence evaluating protein residual activity, however, does not allow convincing conclusions about the variant effect (Zielonka_2019). Five 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 (Pathogenic n=1, likely pathogenic n=2, VUS n=2). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

not provided

Pathogenic:1Uncertain:1

Mar 30, 2023

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 30285816, 25087612, 23891399, 28132756, 12815590, 14680976, 31469252, 12684898, 32778825, 33851512, 35281663) -

Jun 22, 2018

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.91

BayesDel_addAF

Pathogenic

0.39

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.98

D;D;D

Eigen

Pathogenic

0.72

Eigen_PC

Pathogenic

0.68

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.90

.;.;D

M_CAP

Pathogenic

0.67

MetaRNN

Pathogenic

0.94

D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.4

M;M;M

PrimateAI

Pathogenic

0.82

PROVEAN

Uncertain

-2.9

D;D;D

REVEL

Pathogenic

0.93

Sift

Benign

0.043

D;D;D

Sift4G

Uncertain

0.050

T;T;T

Polyphen

0.96

D;D;D

Vest4

0.91

MVP

0.95

MPC

0.54

ClinPred

0.82

GERP RS

4.7

Varity_R

0.81

gMVP

0.90

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

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