rs875989878

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1_ModeratePM2PP5_Very_Strong

The NM_014946.4(SPAST):c.1245+1G>A variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,136 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

SPAST
NM_014946.4 splice_donor, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:18

Conservation

PhyloP100: 8.91

Variant links:

Genes affected

SPAST (HGNC:11233): (spastin) This gene encodes a member of the AAA (ATPases associated with a variety of cellular activities) protein family. Members of this protein family share an ATPase domain and have roles in diverse cellular processes including membrane trafficking, intracellular motility, organelle biogenesis, protein folding, and proteolysis. The use of alternative translational initiation sites in this gene results in a single transcript variant that can produce isoforms that differ in the length of their N-terminus and which thereby differ in the efficiency of their export from the nucleus to the cytoplasm. In addition, alternative splicing results in multiple transcript variants that encode isoforms that differ in other protein regions as well. One isoform of this gene has been shown to be a microtubule-severing enzyme that regulates microtubule abundance, mobility, and plus-end distribution. Mutations in this gene cause the most frequent form of autosomal dominant spastic paraplegia 4. [provided by RefSeq, May 2018]

SPAST links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.038897894 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 2-32128480-G-A is Pathogenic according to our data. Variant chr2-32128480-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 226113.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-32128480-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPAST	NM_014946.4 link	c.1245+1G>A		splice_donor_variant, intron_variant	Intron 9 of 16	ENST00000315285.9	NP_055761.2	Q9UBP0-1E5KRP5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPAST	ENST00000315285.9 link	c.1245+1G>A		splice_donor_variant, intron_variant	Intron 9 of 16	1	NM_014946.4	ENSP00000320885.3		Q9UBP0-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152136

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

1434890

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

715440

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

AF:

0.00000657

AC:

AN:

152136

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74310

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:18

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary spastic paraplegia 4

Pathogenic:10

Jul 14, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: SPAST c.1245+1G>A is located in a canonical splice-site and is predicted to affect mRNA splicing resulting in a significantly altered protein due to either exon skipping, shortening, or inclusion of intronic material. Several computational tools predict a significant impact on normal splicing: Three predict the variant abolishes a canonical 5' splicing donor site. At least one publication reports experimental evidence that this variant indeed affects mRNA splicing and results in the skipping of exon 9 (Svenson_2001). The variant was absent in 251070 control chromosomes (gnomAD). c.1245+1G>A has been reported in the literature in multiple individuals affected with Spastic Paraplegia 4, including four individuals from an Italian family where it was inherited in an autosomal dominant manner (eg. Svenson_2001, Nanetti_2012, Fei_2011, Zhao_2019). These data indicate that the variant is very likely to be associated with disease. The following publications have been ascertained in the context of this evaluation (PMID: 21834905, 22960362, 11309678, 31630374). Twelve submitters have cited clinical-significance assessments for this variant to ClinVar after 2014 and all classified the variant as pathogenic (n=11)/likely pathogenic (n=1). Based on the evidence outlined above, the variant was classified as pathogenic. -

Oct 04, 2024

Al Jalila Children’s Genomics Center, Al Jalila Childrens Speciality Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

PVS1,PS3,PM2 -

Feb 19, 2016

Center of Genomic medicine, Geneva, University Hospital of Geneva

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This inherited mutation in the SPAST gene is the likely cause of the familial spastic paraplegia observed in the patient and in her father. -

Mar 22, 2022

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Canonical splice site: predicted to alter splicing and result in a loss or disruption of normal protein function through nonsense-mediated decay (NMD) or protein truncation. Multiple pathogenic variants are reported downstream of the variant.It is not observed in the gnomAD v2.1.1 dataset. The variant has been reported at least twice as pathogenic/likely pathogenic with clinical assertions and evidence for the classification (ClinVar ID: VCV000226113). Therefore, this variant is classified as pathogenic according to the recommendation of ACMG/AMP guideline. -

Paris Brain Institute, Inserm - ICM

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Istituto Neurologico Mediterraneo, Istituto di Ricovero e Cura a Carattere Scientifico

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jul 24, 2019

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 01, 2022

Solve-RD Consortium

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: provider interpretation

Variant confirmed as disease-causing by referring clinical team -

Dec 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects a donor splice site in intron 9 of the SPAST gene. RNA analysis indicates that disruption of this splice site induces altered splicing and likely results in a shortened protein product. This variant is not present in population databases (gnomAD no frequency). Disruption of this splice site has been observed in individuals with hereditary spastic paraplegia (HSP) (PMID: 11309678, 22552817, 22960362, 26600529). Invitae Evidence Modeling of clinical and family history, age, sex, and reported ancestry of multiple individuals with this SPAST variant has been performed. This variant is expected to be pathogenic with a positive predictive value of at least 99%. This is a validated machine learning model that incorporates the clinical features of 3,690 individuals referred to our laboratory for SPAST testing. This variant is also known as IVS9+1G>A. ClinVar contains an entry for this variant (Variation ID: 226113). Studies have shown that disruption of this splice site results in skipping of 9, but is expected to preserve the integrity of the reading-frame (PMID: 11309678, 26600529). For these reasons, this variant has been classified as Pathogenic. -

Feb 05, 2024

Molecular Genetics, Royal Melbourne Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change in SPAST occurs within the canonical splice donor site of intron 9. It is predicted to cause skipping of biologically relevant exon 9/17, resulting in an in-frame deletion (removes amino acids 392-415) that is expected to escape nonsense-mediated decay and remove part of the AAA ATPase domain which is critical for protein function (PMID: 26094131). This prediction is confirmed by RNA assays in patient cells and minigene assays (PMID: 11309678, 26600529). This variant is present in a single African/African American individual in the population database gnomAD v4.0 (1/56,710 alleles). This variant has been reported in multiple individuals with pure hereditary spastic paraplegia (HSP) and segregates with HSP in multiple families (PMID: 11309678, 21834905, 22552817, 26600529; ClinVar: SCV000268514.1, SCV001190276.1, SCV001450963.1, SCV002105589.1). Based on the classification scheme RMH Modified ACMG/AMP Guidelines v1.6.1, this variant is classified as PATHOGENIC. Following criteria are met: PVS1_Strong, PP1_Strong, PS4_Moderate, PM2_Supporting. -

not provided

Pathogenic:5

Jul 09, 2024

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Canonical splice site variant predicted to result in an in-frame loss of the adjacent exon in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 31227335, 25525159, 11309678, 31630374, 29980238, 19875132, 26600529, 22552817, 22960362, 34983064, 37251230, 31594988, 38145127, 21139634, 26094131) -

Jun 15, 2023

Athena Diagnostics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The frequency of this variant in the general population is consistent with pathogenicity (http://gnomad.broadinstitute.org). This variant is not expected to cause loss of protein expression through nonsense-mediated decay, however, similar variants in this region have been associated with disease, and therefore, this variant is also expected to associate with disease. This variant has been identified in multiple unrelated individuals with clinical features associated with this gene. The variant is located in a region that is considered important for protein function and/or structure. -

Jun 01, 2021

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 01, 2021

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 13, 2020

Mayo Clinic Laboratories, Mayo Clinic

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PVS1, PS3, PS4_moderate, PM1, PM2, PP4 -

SPAST-related spastic paraplegia

Pathogenic:1

Apr 05, 2021

Illumina Laboratory Services, Illumina

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The SPAST c.1245+1G>A variant occurs in a canonical splice site (donor) and is therefore predicted to disrupt the normal gene product. Across a selection of the available literature, the c.1245+1G>A variant has been reported in at least four unrelated individuals affected with hereditary spastic paraplegia (Svenson et al. 2001; Magariello et al. 2010; Nanetti et al. 2012; Zhao et al. 2015). The variant was found to segregate among other affected family members (Svenson et al. 2001; Nanetti et al. 2012; Zhao et al. 2015). The age of onset varied from 4-50 years and clinical features included lower limb stiffness, spastic gait and walking difficulty, among others. The variant is not reported in the Genome Aggregation Database in a region of good sequence coverage, suggesting that it is a rare variant. Experimental studies have shown this variant to result in skipping of exon 9, which encodes for part of the critical ATPase AAA domain of the protein (Svenson et al. 2001). Based on the collective evidence and application of the ACMG criteria, the c.1245+1G>A variant is classified as pathogenic for hereditary spastic paraplegia. -

Inborn genetic diseases

Pathogenic:1

Sep 27, 2019

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary spastic paraplegia

Pathogenic:1

Dec 12, 2016

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Pathogenic

0.43

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Pathogenic

1.2

Eigen_PC

Pathogenic

1.1

FATHMM_MKL

Pathogenic

0.99

GERP RS

5.7

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.94

SpliceAI score (max)

0.98

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.98

Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over