rs1554768212
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Variant summary
Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1PM2PP3
The ENST00000372739.7(SPTAN1):c.6762+3_6762+6del variant causes a splice donor, coding sequence change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,002 control chromosomes in the GnomAD database, with no homozygous occurrence. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 6.8e-7 ( 0 hom. )
Consequence
SPTAN1
ENST00000372739.7 splice_donor, coding_sequence
ENST00000372739.7 splice_donor, coding_sequence
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 9.29
Genes affected
SPTAN1 (HGNC:11273): (spectrin alpha, non-erythrocytic 1) Spectrins are a family of filamentous cytoskeletal proteins that function as essential scaffold proteins that stabilize the plasma membrane and organize intracellular organelles. Spectrins are composed of alpha and beta dimers that associate to form tetramers linked in a head-to-head arrangement. This gene encodes an alpha spectrin that is specifically expressed in nonerythrocytic cells. The encoded protein has been implicated in other cellular functions including DNA repair and cell cycle regulation. Mutations in this gene are the cause of early infantile epileptic encephalopathy-5. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Sep 2010]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 11 ACMG points.
PVS1
Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
PM2
Very rare variant in population databases, with high coverage;
PP3
Multiple lines of computational evidence support a deleterious effect 2: max_spliceai, phyloP100way_vertebrate [when was below the threshold]
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
SPTAN1 | NM_001130438.3 | c.6762+3_6762+6del | splice_donor_variant, coding_sequence_variant | 52/57 | ENST00000372739.7 | NP_001123910.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
SPTAN1 | ENST00000372739.7 | c.6762+3_6762+6del | splice_donor_variant, coding_sequence_variant | 52/57 | 1 | NM_001130438.3 | ENSP00000361824 | P3 | ||
ENST00000630523.1 | n.526_529del | non_coding_transcript_exon_variant | 2/2 | 5 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome AF: 6.85e-7 AC: 1AN: 1460002Hom.: 0 AF XY: 0.00000138 AC XY: 1AN XY: 726302
GnomAD4 exome
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GnomAD4 genome Cov.: 32
GnomAD4 genome
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32
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Early infantile epileptic encephalopathy with suppression bursts Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Dec 24, 2017 | In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Nucleotide substitutions within the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site, but this prediction has not been confirmed by published transcriptional studies. This variant has not been reported in the literature in individuals with SPTAN1-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change falls in intron 52 of the SPTAN1 gene. It does not directly change the encoded amino acid sequence of the SPTAN1 protein, but it affects a nucleotide within the consensus splice site of the intron. - |
Computational scores
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SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_DL_spliceai
Position offset: 2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at