2-201711098-G-C

Position:

• chr2-201711098-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_020919.4(ALS2):​c.4015C>G​(p.Leu1339Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. L1339L) has been classified as Benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: ALS2 NM_020919.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.01

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.39608935).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ALS2	NM_020919.4	c.4015C>G	p.Leu1339Val	missense_variant	26/34	ENST00000264276.11	NP_065970.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ALS2	ENST00000264276.11	c.4015C>G	p.Leu1339Val	missense_variant	26/34	1	NM_020919.4	ENSP00000264276	P4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.089
BayesDel_addAF	Benign	-0.083	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	1.6
DANN	Uncertain	0.99
DEOGEN2	Benign	0.13	T
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.13	N
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.40	T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	1.7	L
MutationTaster	Benign	1.0	P;P
PrimateAI	Uncertain	0.55	T
PROVEAN	Benign	-1.3	N
REVEL	Benign	0.20
Sift	Benign	0.094	T
Sift4G	Uncertain	0.041	D
Polyphen		0.57	P
Vest4		0.40
MutPred		0.24		Gain of sheet (P = 0.0344);
MVP		0.45
MPC		0.25
ClinPred		0.23	T
GERP RS		-8.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.080
gMVP		0.27

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

Other links and lift over

dbSNP: rs3219168; hg19: chr2-202575821;