chr15-44648976-G-A

Position:

• chr15-44648976-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_025137.4(SPG11):​c.1492C>T​(p.Gln498Ter) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,624 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 Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. Q498Q) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: SPG11 NM_025137.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 8.04

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-44648976-G-A is Pathogenic according to our data. Variant chr15-44648976-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 41399.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPG11	NM_025137.4	c.1492C>T	p.Gln498Ter	stop_gained	7/40	ENST00000261866.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPG11	ENST00000261866.12	c.1492C>T	p.Gln498Ter	stop_gained	7/40	1	NM_025137.4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000796 AC: 2 AN: 251250 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135782

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461624 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727134

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary spastic paraplegia 11 Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 17, 2023	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 41399). This premature translational stop signal has been observed in individual(s) with hereditary spastic paraplegia, 24833714 (PMID: 20971220). This variant is present in population databases (rs312262728, gnomAD 0.002%). This sequence change creates a premature translational stop signal (p.Gln498*) in the SPG11 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SPG11 are known to be pathogenic (PMID: 19105190, 20110243, 22154821, 26556829). -
Pathogenic, criteria provided, single submitter	curation	Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard	Jan 25, 2023	The homozygous p.Gln498Ter variant in SPG11 was identified by our study in two siblings with spastic paraplegia. The p.Gln498Ter variant in SPG11 has been reported in 2 unrelated individuals with hereditary spastic paraplegia 11 (PMID: 20971220, PMID: 24833714) and segregated with disease in five affected relatives from one family (PMID: 20971220), but has been identified in 0.002% (2/113568) of European (non-Finnish) chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs312262728). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. Of these 2 unrelated affected individuals (PMID: 20971220, PMID: 24833714), one was a homozygote (PMID: 20971220) and one was a compound heterozygote who carried a likely pathogenic variant in trans (PMID: 24833714, ClinVar Variation ID: 1180685), which increases the likelihood that the p.Gln498Ter variant is pathogenic. This variant has also been reported in ClinVar (Variation ID: 41399) and has been interpreted as pathogenic by the Genome-Nilou Lab, the ‚Äã‚ÄãCeGaT Center for Human Genetics Tuebingen, and GeneReviews. This nonsense variant leads to a premature termination codon at position 498, which is predicted to lead to a truncated or absent protein. Loss of function of the SPG11 gene is an established disease mechanism in autosomal recessive SPG11-related neurologic disease. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive spastic paraplegia 11. ACMG/AMP Criteria applied: PVS1, PM2_Supporting, PM3_Strong, PP1_Moderate (Richards 2015). -
Pathogenic, no assertion criteria provided	curation	GeneReviews	Jan 31, 2013	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Jan 01, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.61	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	0.99	D
MutationTaster	Benign	1.0	A;A;A;A;A
Vest4		0.92
GERP RS		5.8

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs312262728; hg19: chr15-44941174;