rs587777757
Variant summary
Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM1PM2PP3_ModeratePP5_Very_Strong
The NM_014946.4(SPAST):c.1216A>G(p.Ile406Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,460,338 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I406T) has been classified as Uncertain significance.
Frequency
Consequence
NM_014946.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 14 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SPAST | NM_014946.4 | c.1216A>G | p.Ile406Val | missense_variant | 9/17 | ENST00000315285.9 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SPAST | ENST00000315285.9 | c.1216A>G | p.Ile406Val | missense_variant | 9/17 | 1 | NM_014946.4 | P4 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD4 exome AF: 0.00000205 AC: 3AN: 1460338Hom.: 0 Cov.: 28 AF XY: 0.00000138 AC XY: 1AN XY: 726588
GnomAD4 genome ? Cov.: 33
ClinVar
Submissions by phenotype
Hereditary spastic paraplegia 4 Pathogenic:4
Likely pathogenic, no assertion criteria provided | clinical testing | Genomics England Pilot Project, Genomics England | - | - - |
Pathogenic, no assertion criteria provided | literature only | OMIM | Feb 14, 2006 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jul 19, 2022 | This variant is not present in population databases (gnomAD no frequency). This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 406 of the SPAST protein (p.Ile406Val). For these reasons, this variant has been classified as Pathogenic. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. 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 expected to disrupt SPAST protein function. ClinVar contains an entry for this variant (Variation ID: 5675). This missense change has been observed in individual(s) with hereditary spastic paraplegia and was observed to be de novo in at least one individual (PMID: 16476945, 16682546, 16832076, 17971434, 18701882, 19423133). In at least one individual the variant was observed to be de novo. It has also been observed to segregate with disease in related individuals. - |
Pathogenic, criteria provided, single submitter | clinical testing | Paris Brain Institute, Inserm - ICM | - | - - |
not provided Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Athena Diagnostics | Dec 16, 2020 | This variant has not been reported in large, multi-ethnic general populations (http://gnomad.broadinstitute.org). This variant appears to occur de novo in one individual with clinical features associated with this gene. Computational tools yielded predictions that this variant may result in the gain of a cryptic splice site without affecting the natural splice sites. This variant has been identified in multiple unrelated individuals with clinical features associated with this gene. Assessment of experimental evidence regarding the effect of this variant on protein function is inconclusive. This variant resulted in a 30-bp deletion when expressed in a cell line. However, only 20% of transcript was affected and it is unclear if this is sufficient aberrant transcript to cause disease (PMID 16476945). Computational tools predict that this variant is damaging. The variant is located in a region that is considered important for protein function and/or structure. - |
Likely pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Aug 16, 2019 | Identified in patients with HSP in published literature, but segregation data is limited or absent for these individuals due to the lack of clinical information provided and/or insufficient participation by informative family members (Crippa et al., 2006; Svenstrup et al., 2009; de Bot et al., 2010); A different missense change at this residue (p.I406R) has been reported in the published literature in association with hereditary spastic paraplegia (Nanetti et al., 2012); Published functional studies demonstrate damaging effects, including aberrant in-frame splicing, destabilization of mutated transcript, and deficient in microtubule-severing activity (Schickel et al., 2006); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Not observed in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 16832076, 20562464, 19423133, 16476945, 31157359, 16055926, 16682546, 30476002) - |
Hereditary spastic paraplegia Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Genome Diagnostics Laboratory, The Hospital for Sick Children | Aug 15, 2017 | - - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at