2-201726800-G-T

Variant names:

• chr2-201726800-G-T
• rs41308840
• NM_020919.4:c.3046C>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_020919.4(ALS2):​c.3046C>A​(p.Pro1016Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000233 in 1,461,882 control chromosomes in the GnomAD database, with no homozygous occurrence. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P1016A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000023 (0 hom.)
• Consequence: ALS2 NM_020919.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.878
• Publications: 6 publications found

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 Gene-Disease associations (from GenCC):

• ALS2-related motor neuron disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• amyotrophic lateral sclerosis type 2, juvenile

  Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
• infantile-onset ascending hereditary spastic paralysis

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet
• juvenile primary lateral sclerosis

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Orphanet
• juvenile amyotrophic lateral sclerosis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020919.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALS2	NM_020919.4	MANE Select	c.3046C>A	p.Pro1016Thr	missense	Exon 18 of 34	NP_065970.2
	ALS2	NM_001410975.1		c.3046C>A	p.Pro1016Thr	missense	Exon 18 of 34	NP_001397904.1	A0A7P0T8F3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALS2	ENST00000264276.11	TSL:1 MANE Select	c.3046C>A	p.Pro1016Thr	missense	Exon 18 of 34	ENSP00000264276.6	Q96Q42-1
	ALS2	ENST00000482891.6	TSL:1	n.3814C>A		non_coding_transcript_exon	Exon 17 of 22
	ALS2	ENST00000680497.1		c.3148C>A	p.Pro1050Thr	missense	Exon 18 of 34	ENSP00000505954.1	A0A7P0Z4F3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.0000160 AC: 4 AN: 249496 AF XY: 0.0000295

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: 0.00

Gnomad NFE exome AF: 0.0000177

Gnomad OTH exome AF: 0.000330

GnomAD4 exome AF: 0.0000233 AC: 34 AN: 1461882 Hom.: 0 Cov.: 33 AF XY: 0.0000275 AC XY: 20 AN XY: 727238

African (AFR) AF: 0.00 AC: 0 AN: 33480

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

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.000277 AC: 11 AN: 39698

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00104 AC: 6 AN: 5768

European-Non Finnish (NFE) AF: 0.0000108 AC: 12 AN: 1112002

Other (OTH) AF: 0.0000662 AC: 4 AN: 60396

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000150 Hom.: 0

ExAC AF: 0.0000165 AC: 2

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Infantile-onset ascending hereditary spastic paralysis (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Benign	-0.017	T
BayesDel_noAF	Benign	-0.20
CADD	Benign	4.9
DANN	Benign	0.28
DEOGEN2	Benign	0.081	T
Eigen	Benign	-1.0
Eigen_PC	Benign	-0.90
FATHMM_MKL	Benign	0.21	N
LIST_S2	Benign	0.68	T
M_CAP	Benign	0.015	T
MetaRNN	Uncertain	0.66	D
MetaSVM	Benign	-0.95	T
MutationAssessor	Benign	1.6	L
PhyloP100		0.88
PrimateAI	Benign	0.25	T
PROVEAN	Benign	-0.32	N
REVEL	Uncertain	0.41
Sift	Benign	0.81	T
Sift4G	Benign	0.77	T
Polyphen		0.0010	B
Vest4		0.73
MutPred		0.70		Gain of phosphorylation at P1016 (P = 0.0039)
MVP		0.57
MPC		0.26
ClinPred		0.041	T
GERP RS		4.8
Varity_R		0.037
gMVP		0.39
Mutation Taster		=19/81	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: rs41308840; hg19: chr2-202591523;