chr14-50593859-C-A

Position:

• chr14-50593859-C-A

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP2 PP3_Moderate PP5

The NM_015915.5(ATL1):​c.536C>A​(p.Ser179Tyr) 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).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ATL1 NM_015915.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 7.83

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 8 ACMG points.

• PM1: In a domain GB1/RHD3-type G (size 245) in uniprot entity ATLA1_HUMAN there are 75 pathogenic changes around while only 4 benign (95%) in NM_015915.5
• PM2: Very rare variant in population databases, with high coverage
• 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, 0.865
• PP5: Variant 14-50593859-C-A is Pathogenic according to our data. Variant chr14-50593859-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 538581.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.536C>A	p.Ser179Tyr	missense_variant	5/14	ENST00000358385.12
ATL1	NM_001127713.1	c.536C>A	p.Ser179Tyr	missense_variant	6/14
ATL1	NM_181598.4	c.536C>A	p.Ser179Tyr	missense_variant	5/13
ATL1	XM_047431430.1	c.536C>A	p.Ser179Tyr	missense_variant	6/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATL1	ENST00000358385.12	c.536C>A	p.Ser179Tyr	missense_variant	5/14	1	NM_015915.5	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1452090 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 723042

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

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

Labcorp Genetics (formerly Invitae), Labcorp

Aug 04, 2023

This sequence change replaces serine, which is neutral and polar, with tyrosine, which is neutral and polar, at codon 179 of the ATL1 protein (p.Ser179Tyr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with ATL1-related conditions (Invitae). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 538581). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ATL1 protein function. 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 provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Mayo Clinic Laboratories, Mayo Clinic

Jun 01, 2023

PM2 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	31
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.74	.;D;D
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.87	D;D;D
MetaSVM	Uncertain	-0.042	T
MutationAssessor	Pathogenic	3.3	M;M;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-5.3	D;D;D
REVEL	Uncertain	0.47
Sift	Uncertain	0.0020	D;D;D
Sift4G	Uncertain	0.028	D;D;T
Polyphen		1.0	.;D;.
Vest4		0.80
MutPred		0.65		Loss of disorder (P = 0.0642);Loss of disorder (P = 0.0642);.;
MVP		0.79
MPC		1.9
ClinPred		1.0	D
GERP RS		4.6
Varity_R		0.90
gMVP		0.90

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: rs1555364149; hg19: chr14-51060577;