rs1060502971

Variant names:

• chr14-50591578-A-G
• rs1060502971
• NM_015915.5:c.461A>G

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM2 PP2 PP5

The NM_015915.5(ATL1):​c.461A>G​(p.Gln154Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q154E) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATL1 NM_015915.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 9.23
• Publications: 0 publications found

Genes affected

ATL1 (HGNC:11231): (atlastin GTPase 1) The protein encoded by this gene is a GTPase and a Golgi body transmembrane protein. The encoded protein can form a homotetramer and has been shown to interact with spastin and with mitogen-activated protein kinase kinase kinase kinase 4. This protein may be involved in axonal maintenance as evidenced by the fact that defects in this gene are a cause of spastic paraplegia type 3. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ATL1 Gene-Disease associations (from GenCC):

• hereditary spastic paraplegia 3A

  Inheritance: AD, SD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• neuropathy, hereditary sensory, type 1D

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae)
• hereditary sensory and autonomic neuropathy type 1

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_015915.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the ATL1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 60 curated pathogenic missense variants (we use a threshold of 10). The gene has 10 curated benign missense variants. Gene score misZ: 2.6313 (below the threshold of 3.09). Trascript score misZ: 3.8383 (above the threshold of 3.09). GenCC associations: The gene is linked to hereditary spastic paraplegia 3A, neuropathy, hereditary sensory, type 1D, hereditary sensory and autonomic neuropathy type 1.
• PP5: Variant 14-50591578-A-G is Pathogenic according to our data. Variant chr14-50591578-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 410596.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATL1	NM_015915.5	c.461A>G	p.Gln154Arg	missense_variant	Exon 4 of 14	ENST00000358385.12	NP_056999.2
ATL1	NM_001127713.1	c.461A>G	p.Gln154Arg	missense_variant	Exon 5 of 14		NP_001121185.1
ATL1	NM_181598.4	c.461A>G	p.Gln154Arg	missense_variant	Exon 4 of 13		NP_853629.2
ATL1	XM_047431430.1	c.461A>G	p.Gln154Arg	missense_variant	Exon 5 of 15		XP_047287386.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATL1	ENST00000358385.12	c.461A>G	p.Gln154Arg	missense_variant	Exon 4 of 14	1	NM_015915.5	ENSP00000351155.7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary spastic paraplegia 3A Pathogenic:1 Uncertain:1

Dec 05, 2023

3billion

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. Predicted Consequence/Location: Missense changes are a common disease-causing mechanism. In silico tool predictions suggest damaging effect of the variant on gene or gene product [3Cnet: 0.63 (>=0.6, sensitivity 0.72 and precision 0.9)]. Same nucleotide change resulting in same amino acid change (ClinVar ID: VCV000410596) and a different missense change at the same codon (p.Gln154Glu / PMID: 20932283) have been previously reported to be associated with ATL1 related disorder. Therefore, this variant is classified as Likely pathogenic according to the recommendation of ACMG/AMP guideline. -

Mar 03, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamine with arginine at codon 154 of the ATL1 protein (p.Gln154Arg). The glutamine residue is highly conserved and there is a small physicochemical difference between glutamine and arginine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a ATL1-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C35"). However, a different missense substitution at this codon (p.Gln154Glu) is reported to be deleterious (PMID: 20932283). This indicates that the p.Gln154 residue is important for ATL1 protein function. In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. -

Abnormal pyramidal sign Pathogenic:1

-

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.61	.;D;T
Eigen	Uncertain	0.37
Eigen_PC	Uncertain	0.48
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;D
M_CAP	Uncertain	0.092	D
MetaRNN	Uncertain	0.67	D;D;D
MetaSVM	Uncertain	-0.17	T
MutationAssessor	Pathogenic	3.1	M;M;.
PhyloP100		9.2
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-3.0	D;D;D
REVEL	Uncertain	0.55
Sift	Uncertain	0.0060	D;D;T
Sift4G	Uncertain	0.015	D;D;D
Polyphen		0.16	.;B;.
Vest4		0.76
MutPred		0.39		Gain of phosphorylation at T156 (P = 0.0839);Gain of phosphorylation at T156 (P = 0.0839);.;
MVP		0.90
MPC		0.80
ClinPred		0.98	D
GERP RS		5.5
Varity_R		0.82
gMVP		0.63
Mutation Taster		=14/86	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: rs1060502971; hg19: chr14-51058296;