rs116103138

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_054012.4(ASS1):c.364-6T>C variant causes a splice region, intron change. The variant allele was found at a frequency of 0.00179 in 1,613,974 control chromosomes in the GnomAD database, including 34 homozygotes. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0082 ( 12 hom., cov: 33)

Exomes 𝑓: 0.0011 ( 22 hom. )

Consequence

ASS1
NM_054012.4 splice_region, intron

Scores

Splicing: ADA: 0.002996

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 3.65

Publications

3 publications found

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 Gene-Disease associations (from GenCC):

citrullinemia type I
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Myriad Women’s Health, G2P
acute neonatal citrullinemia type I
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
adult-onset citrullinemia type I
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ASS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.58).

BP6

Variant 9-130464105-T-C is Benign according to our data. Variant chr9-130464105-T-C is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 254745.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0082 (1247/152116) while in subpopulation AFR AF = 0.0281 (1164/41486). AF 95% confidence interval is 0.0267. There are 12 homozygotes in GnomAd4. There are 597 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 12 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_054012.4. 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
	ASS1	NM_054012.4	MANE Select	c.364-6T>C		splice_region intron	N/A	NP_446464.1
	ASS1	NM_000050.4		c.364-6T>C		splice_region intron	N/A	NP_000041.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
ASS1	ENST00000352480.10	TSL:1 MANE Select	c.364-6T>C	splice_region intron	N/A	ENSP00000253004.6
ASS1	ENST00000372393.7	TSL:5	c.364-6T>C	splice_region intron	N/A	ENSP00000361469.2
ASS1	ENST00000372394.5	TSL:2	c.364-6T>C	splice_region intron	N/A	ENSP00000361471.1

Frequencies

GnomAD3 genomes

AF:

0.00820

AC:

1246

AN:

151998

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0281

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00373

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.000206

Gnomad OTH

AF:

0.00526

GnomAD2 exomes

AF:

0.00262

AC:

658

AN:

251418

AF XY:

0.00207

show subpopulations

Gnomad AFR exome

AF:

0.0304

Gnomad AMR exome

AF:

0.00321

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000343

Gnomad OTH exome

AF:

0.00212

GnomAD4 exome

AF:

0.00112

AC:

1640

AN:

1461858

Hom.:

Cov.:

AF XY:

0.000987

AC XY:

718

AN XY:

727232

show subpopulations

African (AFR)

AF:

0.0300

AC:

1003

AN:

33474

American (AMR)

AF:

0.00333

AC:

149

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.000191

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00641

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000265

AC:

295

AN:

1111988

Other (OTH)

AF:

0.00247

AC:

149

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.476

Heterozygous variant carriers

193

290

386

483

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

120

160

200

<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:

0.00820

AC:

1247

AN:

152116

Hom.:

Cov.:

AF XY:

0.00803

AC XY:

597

AN XY:

74364

show subpopulations

African (AFR)

AF:

0.0281

AC:

1164

AN:

41486

American (AMR)

AF:

0.00373

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5164

South Asian (SAS)

AF:

0.00

AC:

AN:

4814

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10594

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000206

AC:

AN:

67980

Other (OTH)

AF:

0.00521

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

Heterozygous variant carriers

136

205

273

341

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<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:

0.00446

Hom.:

Bravo

AF:

0.00958

Asia WGS

AF:

0.00173

AC:

AN:

3478

EpiCase

AF:

0.000436

EpiControl

AF:

0.000356

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Citrullinemia type I

Benign:3

May 05, 2017

Natera, Inc.

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

Aug 07, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign.

not specified

Benign:2

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jun 22, 2016

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.

Citrullinemia

Benign:1

Jan 07, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.58

CADD

Benign

9.8

(source)

DANN

Benign

0.73

PhyloP100

3.6

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.0030

dbscSNV1_RF

Benign

0.056

SpliceAI score (max)

0.33

Details are displayed if max score is > 0.2

DS_AL_spliceai

0.33

Position offset: 6

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over