7-66088873-T-C

Variant names:

• chr7-66088873-T-C
• rs1554327586
• NM_000048.4:c.785T>C

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1 PM2 PP2 PP3_Strong

The NM_000048.4(ASL):​c.785T>C​(p.Leu262Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (no stars). Synonymous variant affecting the same amino acid position (i.e. L262L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ASL NM_000048.4 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:1
• Conservation: PhyloP100: 7.40
• Publications: 0 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 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 1 uncertain in NM_000048.4
• PM2: Very rare variant in population databases, with high coverage
• 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, 0.951

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.785T>C	p.Leu262Pro	missense	Exon 11 of 17	NP_000039.2
	ASL	NM_001024943.2		c.785T>C	p.Leu262Pro	missense	Exon 10 of 16	NP_001020114.1
	ASL	NM_001024944.2		c.785T>C	p.Leu262Pro	missense	Exon 10 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.785T>C	p.Leu262Pro	missense	Exon 11 of 17	ENSP00000307188.9
	ASL	ENST00000395332.8	TSL:1	c.785T>C	p.Leu262Pro	missense	Exon 10 of 16	ENSP00000378741.3
	ENSG00000249319	ENST00000450043.2	TSL:5	c.98T>C	p.Leu33Pro	missense	Exon 2 of 12	ENSP00000396527.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: no assertion criteria provided

Submissions by phenotype

Argininosuccinate lyase deficiency Uncertain:1

Jan 03, 2018

Counsyl

Significance: Uncertain significance

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.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.99	D
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.98	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.9	H
PhyloP100		7.4
PrimateAI	Uncertain	0.72	T
PROVEAN	Pathogenic	-5.3	D
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.90
MutPred		0.74		Loss of stability (P = 0.0543)
MVP		0.99
MPC		1.2
ClinPred		1.0	D
GERP RS		5.8
PromoterAI		-0.013	Neutral
Varity_R		0.97
gMVP		0.97
Mutation Taster		=5/95	disease causing

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

Other links and lift over

dbSNP: rs1554327586; hg19: chr7-65553860;