2-201701404-C-T

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_StrongBP6_ModerateBS1BS2

The NM_020919.4(ALS2):c.*447G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0103 in 159,680 control chromosomes in the GnomAD database, including 30 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

Frequency

Genomes: 𝑓 0.011 ( 30 hom., cov: 32)

Exomes 𝑓: 0.0011 ( 0 hom. )

Consequence

ALS2
NM_020919.4 3_prime_UTR

Scores

Clinical Significance

Benign criteria provided, single submitter B:2

Conservation

PhyloP100: 1.05

Variant links:

Genes affected

ALS2 (HGNC:443): (alsin Rho guanine nucleotide exchange factor ALS2) The protein encoded by this gene contains an ATS1/RCC1-like domain, a RhoGEF domain, and a vacuolar protein sorting 9 (VPS9) domain, all of which are guanine-nucleotide exchange factors that activate members of the Ras superfamily of GTPases. The protein functions as a guanine nucleotide exchange factor for the small GTPase RAB5. The protein localizes with RAB5 on early endosomal compartments, and functions as a modulator for endosomal dynamics. Mutations in this gene result in several forms of juvenile lateral sclerosis and infantile-onset ascending spastic paralysis. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2008]

ALS2 links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -14 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.52).

BP6

Variant 2-201701404-C-T is Benign according to our data. Variant chr2-201701404-C-T is described in ClinVar as [Benign]. Clinvar id is 333578.Status of the report is criteria_provided_single_submitter, 1 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0107 (1635/152240) while in subpopulation AFR AF= 0.0366 (1521/41524). AF 95% confidence interval is 0.0351. There are 30 homozygotes in gnomad4. There are 766 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd at 29 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ALS2	NM_020919.4 linkuse as main transcript	c.*447G>A		3_prime_UTR_variant	34/34	ENST00000264276.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ALS2	ENST00000264276.11 linkuse as main transcript	c.*447G>A		3_prime_UTR_variant	34/34	1	NM_020919.4	P4	Q96Q42-1

Frequencies

GnomAD3 genomes

AF:

0.0107

AC:

1634

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0367

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00504

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:

0.000221

Gnomad OTH

AF:

0.0105

GnomAD4 exome

AF:

0.00108

AC:

AN:

7440

Hom.:

Cov.:

AF XY:

0.000997

AC XY:

AN XY:

4012

show subpopulations

Gnomad4 AFR exome

AF:

0.0526

Gnomad4 AMR exome

AF:

0.00162

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:

0.000247

Gnomad4 OTH exome

AF:

0.00338

GnomAD4 genome

AF:

0.0107

AC:

1635

AN:

152240

Hom.:

Cov.:

AF XY:

0.0103

AC XY:

766

AN XY:

74440

show subpopulations

Gnomad4 AFR

AF:

0.0366

Gnomad4 AMR

AF:

0.00503

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000221

Gnomad4 OTH

AF:

0.0104

Alfa

AF:

0.00974

Hom.:

Bravo

AF:

0.0122

Asia WGS

AF:

0.00202

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Amyotrophic lateral sclerosis type 2, juvenile

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

ALS2-related disorder

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.52

Cadd

Benign

Dann

Benign

0.76

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