chr7-66082887-T-C

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 19 ACMG points: 19P and 0B. PM1PM2PM5PP2PP3_StrongPP5_Very_Strong

The NM_000048.4(ASL):c.299T>C(p.Ile100Thr) variant causes a missense change. The variant allele was found at a frequency of 0.0000768 in 1,613,740 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I100N) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000092 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000075 ( 1 hom. )

Consequence

ASL
NM_000048.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 7.05

Publications

7 publications found

Variant links:

Genes affected

ASL (HGNC:746): (argininosuccinate lyase) This gene encodes a member of the lyase 1 family. The encoded protein forms a cytosolic homotetramer and primarily catalyzes the reversible hydrolytic cleavage of argininosuccinate into arginine and fumarate, an essential step in the liver in detoxifying ammonia via the urea cycle. Mutations in this gene result in the autosomal recessive disorder argininosuccinic aciduria, or argininosuccinic acid lyase deficiency. A nontranscribed pseudogene is also located on the long arm of chromosome 22. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

ASL Gene-Disease associations (from GenCC):

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

ASL links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 19 ACMG points.

PM1

In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 1 uncertain in NM_000048.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr7-66082887-T-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 1685244.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 95 curated pathogenic missense variants (we use a threshold of 10). The gene has 10 curated benign missense variants. Gene score misZ: 0.7488 (below the threshold of 3.09). Trascript score misZ: 1.388 (below the threshold of 3.09). GenCC associations: The gene is linked to argininosuccinic aciduria.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.943

PP5

Variant 7-66082887-T-C is Pathogenic according to our data. Variant chr7-66082887-T-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 495379.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ASL	NM_000048.4 link	c.299T>C	p.Ile100Thr	missense_variant	Exon 5 of 17	ENST00000304874.14	NP_000039.2	P04424-1A0A024RDL8
ASL	NM_001024943.2 link	c.299T>C	p.Ile100Thr	missense_variant	Exon 4 of 16		NP_001020114.1	P04424-1A0A024RDL8
ASL	NM_001024944.2 link	c.299T>C	p.Ile100Thr	missense_variant	Exon 4 of 15		NP_001020115.1	P04424-2
ASL	NM_001024946.2 link	c.299T>C	p.Ile100Thr	missense_variant	Exon 4 of 15		NP_001020117.1	A0A0S2Z316

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ASL	ENST00000304874.14 link	c.299T>C	p.Ile100Thr	missense_variant	Exon 5 of 17	1	NM_000048.4	ENSP00000307188.9		P04424-1

Frequencies

GnomAD3 genomes

AF:

0.0000921

AC:

AN:

152036

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.000754

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000124

AC:

AN:

250666

AF XY:

0.000118

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00125

Gnomad NFE exome

AF:

0.0000265

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000753

AC:

110

AN:

1461586

Hom.:

Cov.:

AF XY:

0.0000839

AC XY:

AN XY:

727084

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000696

AC:

AN:

86242

European-Finnish (FIN)

AF:

0.00132

AC:

AN:

53224

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5712

European-Non Finnish (NFE)

AF:

0.0000279

AC:

AN:

1112000

Other (OTH)

AF:

0.0000497

AC:

AN:

60380

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000920

AC:

AN:

152154

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74410

show subpopulations

African (AFR)

AF:

0.0000481

AC:

AN:

41538

American (AMR)

AF:

0.00

AC:

AN:

15264

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5160

South Asian (SAS)

AF:

0.000207

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.000754

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

67974

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000495

Hom.:

ExAC

AF:

0.000148

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Argininosuccinate lyase deficiency

Pathogenic:5

Sep 09, 2016

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

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: The c.299T>C (p.Ile100Thr) in ASL gene is a missense change that alters a highly conserved nucleotide and 4/5 in silico tools predict deleterious outcome. The variant was observed in the large and broad cohorts of the ExAC project at an allele frequency of 0.00014 (17/118940 chrs tested). This frequency does not exceed the maximal expected allele frequency for a pathogenic variant in ASL gene (0.004). The results of functional studies are contradictious, depending on the expression system and ranging from ~90% of residual enzymatic activity in HEK293T to no detectable activity in bacterial cells. Since there is no information from the most reliable functional assay, such as citrulline incorporation was published at the time of evaluation, the results from the other functional assays mentioned above should be taken with caution. The variant was found homozygously or in compound heterozygosity in multiple affected individuals with established diagnosis of ASLD. Taken together, the variant was classified as Pathogenic. -

Feb 13, 2017

Counsyl

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Feb 22, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 100 of the ASL protein (p.Ile100Thr). This variant is present in population databases (rs202142867, gnomAD 0.1%). This missense change has been observed in individuals with argininosuccinate lyase deficiency (PMID: 12384776, 18616627, 22231378). It is commonly reported in individuals of Finnish ancestry (PMID: 22231378). ClinVar contains an entry for this variant (Variation ID: 495379). 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) performed at Invitae indicates that this missense variant is expected to disrupt ASL protein function with a positive predictive value of 95%. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on ASL function (PMID: 21667091, 25778938, 31943503). For these reasons, this variant has been classified as Pathogenic. -

Mar 17, 2024

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 17, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Pathogenic:1

Jun 05, 2024

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: 21667091, 22231378, 31943503, 12384776, 25778938, 24166829, 35314707, 18616627) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Pathogenic

0.44

BayesDel_noAF

Pathogenic

0.49

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.96

D;.;D;D;.

Eigen

Uncertain

0.57

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.87

.;D;D;D;D

M_CAP

Pathogenic

0.96

MetaRNN

Pathogenic

0.94

D;D;D;D;D

MetaSVM

Pathogenic

1.0

MutationAssessor

Uncertain

2.4

M;M;M;.;M

PhyloP100

7.1

PrimateAI

Uncertain

0.78

PROVEAN

Pathogenic

-4.5

D;D;D;D;D

REVEL

Pathogenic

0.91

Sift

Benign

0.088

T;T;T;T;T

Sift4G

Benign

0.081

T;T;T;D;T

Polyphen

1.0

D;.;D;.;.

Vest4

0.98

MutPred

0.95

Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);Gain of disorder (P = 0.0068);.;Gain of disorder (P = 0.0068);

MVP

0.99

MPC

1.0

ClinPred

0.76

GERP RS

4.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.63

gMVP

0.90

Mutation Taster

=12/88

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

Splicevardb

2.0

SpliceAI score (max)

0.030

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over