chr2-201760892-C-G

Position:

• chr2-201760892-C-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_020919.4(ALS2):​c.1102G>C​(p.Val368Leu) 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. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V368M) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ALS2 NM_020919.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.95

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.050623894).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ALS2	NM_020919.4	c.1102G>C	p.Val368Leu	missense_variant	4/34	ENST00000264276.11	NP_065970.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ALS2	ENST00000264276.11	c.1102G>C	p.Val368Leu	missense_variant	4/34	1	NM_020919.4	ENSP00000264276.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 58

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.73
CADD	Benign	0.0020
DANN	Benign	0.56
DEOGEN2	Benign	0.072	T;.
Eigen	Benign	-2.1
Eigen_PC	Benign	-2.1
FATHMM_MKL	Benign	0.027	N
LIST_S2	Benign	0.092	T;T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.051	T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	0.55	N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	0.11	N;N
REVEL	Benign	0.0080
Sift	Benign	0.56	T;T
Sift4G	Benign	0.53	T;T
Polyphen		0.0	B;B
Vest4		0.028
MutPred		0.23		Gain of catalytic residue at V368 (P = 0.0247);Gain of catalytic residue at V368 (P = 0.0247);
MVP		0.26
MPC		0.23
ClinPred		0.029	T
GERP RS		-3.8
Varity_R		0.022
gMVP		0.19

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: rs3219156; hg19: chr2-202625615;