7-66092787-G-C

Variant names:

• chr7-66092787-G-C
• rs368264870
• NM_000048.4:c.1270G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate

The NM_000048.4(ASL):​c.1270G>C​(p.Val424Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,596 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V424M) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: ASL NM_000048.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.60
• Publications: 1 publications found

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

ENSG00000249319 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 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 chr7-66092787-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 360569.
• 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, 0.877

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000048.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ASL	NM_000048.4	MANE Select	c.1270G>C	p.Val424Leu	missense	Exon 17 of 17	NP_000039.2
	ASL	NM_001024943.2		c.1270G>C	p.Val424Leu	missense	Exon 16 of 16	NP_001020114.1
	ASL	NM_001024944.2		c.1210G>C	p.Val404Leu	missense	Exon 15 of 15	NP_001020115.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ASL	ENST00000304874.14	TSL:1 MANE Select	c.1270G>C	p.Val424Leu	missense	Exon 17 of 17	ENSP00000307188.9
	ASL	ENST00000395332.8	TSL:1	c.1270G>C	p.Val424Leu	missense	Exon 16 of 16	ENSP00000378741.3
	ENSG00000249319	ENST00000450043.2	TSL:5	c.563+124G>C		intron	N/A	ENSP00000396527.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461596 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727114

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26130

East Asian (EAS) AF: 0.0000756 AC: 3 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53158

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111988

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.16
CADD	Benign	21
DANN	Uncertain	0.98
DEOGEN2	Pathogenic	0.94	D
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.94	D
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.88	D
MetaSVM	Pathogenic	0.80	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		6.6
PrimateAI	Uncertain	0.74	T
PROVEAN	Uncertain	-2.6	D
REVEL	Pathogenic	0.67
Sift	Benign	0.064	T
Sift4G	Uncertain	0.043	D
Polyphen		0.98	D
Vest4		0.59
MutPred		0.58		Loss of catalytic residue at V424 (P = 0.1226)
MVP		0.92
MPC		0.60
ClinPred		0.92	D
GERP RS		5.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.72
gMVP		0.79
Mutation Taster		=52/48	polymorphism

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

Other links and lift over

dbSNP: rs368264870; hg19: chr7-65557774;