rs864622190

Positions:

• chr15-44563201-GTTC-GAACAG

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The ENST00000261866.12(SPG11):​c.7249_7251delinsCTGTT​(p.Glu2417LeufsTer9) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SPG11 ENST00000261866.12 frameshift
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.70

Genes affected

SPG11 (HGNC:11226): (SPG11 vesicle trafficking associated, spatacsin) The protein encoded by this gene is a potential transmembrane protein that is phosphorylated upon DNA damage. Defects in this gene are a cause of spastic paraplegia type 11 (SPG11). Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.0113 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SPG11	NM_025137.4	c.7249_7251delinsCTGTT	p.Glu2417LeufsTer9	frameshift_variant	40/40	ENST00000261866.12	NP_079413.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SPG11	ENST00000261866.12	c.7249_7251delinsCTGTT	p.Glu2417LeufsTer9	frameshift_variant	40/40	1	NM_025137.4	ENSP00000261866

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spastic paraplegia 11 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 28, 2015

This sequence change deletes 5 and inserts 3 nucleotides in exon 40 of the SPG11 mRNA (c.7249_7251delinsCTGTT), causing a frameshift at codon 2417. This creates a premature translational stop signal in the last exon of the SPG11 mRNA (p.Glu2417Leufs*9). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 27 codons and result in a truncated SPG11 protein. While this particular variant has not been reported in the literature, truncating variants in SPG11 are known to be pathogenic (PMID: 18079167). In summary, this is a novel truncating variant. However, it occurs near the end of the coding sequence and is not expected to result in nonsense mediated decay. For these reasons, this change has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs864622190; hg19: chr15-44855400;