rs1555363969

Positions:

• chr14-50591598-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PM5 PP2 PP3 PP5

The NM_015915.5(ATL1):​c.481G>T​(p.Ala161Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 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. A161V) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATL1 NM_015915.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 9.90

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a hotspot region, there are 6 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
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr14-50591599-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1486086.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ATL1. . Gene score misZ 2.6313 (greater than the threshold 3.09). Trascript score misZ 3.8383 (greater than threshold 3.09). GenCC has associacion of gene with hereditary sensory and autonomic neuropathy type 1, hereditary spastic paraplegia 3A, neuropathy, hereditary sensory, type 1D.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.753
• PP5: Variant 14-50591598-G-T is Pathogenic according to our data. Variant chr14-50591598-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 446866.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ATL1	NM_015915.5	c.481G>T	p.Ala161Ser	missense_variant	4/14	ENST00000358385.12
ATL1	NM_001127713.1	c.481G>T	p.Ala161Ser	missense_variant	5/14
ATL1	NM_181598.4	c.481G>T	p.Ala161Ser	missense_variant	4/13
ATL1	XM_047431430.1	c.481G>T	p.Ala161Ser	missense_variant	5/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATL1	ENST00000358385.12	c.481G>T	p.Ala161Ser	missense_variant	4/14	1	NM_015915.5	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary spastic paraplegia 3A Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Invitae

Sep 11, 2023

Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt ATL1 protein function. ClinVar contains an entry for this variant (Variation ID: 446866). This missense change has been observed in individuals with autosomal dominant hereditary spastic paraplegia (Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 161 of the ATL1 protein (p.Ala161Ser). This variant disrupts the p.Ala161 amino acid residue in ATL1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 23684613; Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Athena Diagnostics

Oct 07, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Uncertain	0.14	D
BayesDel_noAF	Uncertain	-0.030
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.62	.;D;T
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;D
M_CAP	Benign	0.071	D
MetaRNN	Pathogenic	0.75	D;D;D
MetaSVM	Uncertain	-0.024	T
MutationAssessor	Uncertain	2.2	M;M;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Uncertain	-2.8	D;D;D
REVEL	Uncertain	0.51
Sift	Uncertain	0.0040	D;D;T
Sift4G	Uncertain	0.043	D;D;T
Polyphen		0.58	.;P;.
Vest4		0.62
MutPred		0.73		Gain of disorder (P = 0.0206);Gain of disorder (P = 0.0206);.;
MVP		0.82
MPC		1.4
ClinPred		0.99	D
GERP RS		4.6
Varity_R		0.76
gMVP		0.79

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: rs1555363969; hg19: chr14-51058316;