rs778305085

Positions:

• chr15-44563298-A-C
• chr15-44563298-A-G
• chr15-44563298-A-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1_Moderate PM2 PP5_Very_Strong

The NM_025137.4(SPG11):​c.7155T>G​(p.Tyr2385*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000206 in 1,459,770 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: SPG11 NM_025137.4 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 0.109

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]

SPG11 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 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 0.0241 CDS is truncated, and there are 1 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-44563298-A-C is Pathogenic according to our data. Variant chr15-44563298-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 378638.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SPG11	NM_025137.4	c.7155T>G	p.Tyr2385*	stop_gained	40/40	ENST00000261866.12	NP_079413.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SPG11	ENST00000261866.12	c.7155T>G	p.Tyr2385*	stop_gained	40/40	1	NM_025137.4	ENSP00000261866.7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000206 AC: 3 AN: 1459770 Hom.: 0 Cov.: 29 AF XY: 0.00000138 AC XY: 1 AN XY: 726390

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.: 32

Alfa AF: 0.0000329 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary spastic paraplegia 11 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Mar 02, 2023	This sequence change creates a premature translational stop signal (p.Tyr2385*) in the SPG11 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 59 amino acid(s) of the SPG11 protein. This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with clinical features of SPG11-related conditions (PMID: 27066562). ClinVar contains an entry for this variant (Variation ID: 378638). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. This variant disrupts a region of the SPG11 protein in which other variant(s) (p.His2388Thrfs*6) have been determined to be pathogenic (Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	-	- -

Amyotrophic lateral sclerosis type 5 Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	-	- -
Pathogenic, criteria provided, single submitter	research	Suna and Inan Kirac Foundation Neurodegeneration Research Laboratory, Koc University	Mar 31, 2020	- -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Sep 17, 2019

Nonsense variant predicted to result in protein truncation, although loss-of-function variants have not been reported downstream of this position in the protein; Not observed in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 27066562, 32579787) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.078	D
BayesDel_noAF	Benign	-0.13
CADD	Pathogenic	38
DANN	Uncertain	0.99
DEOGEN2	Benign	0.011	T
Eigen	Uncertain	0.19
Eigen_PC	Benign	-0.0090
FATHMM_MKL	Benign	0.75	D
LIST_S2	Benign	0.32	T
MetaRNN	Benign	0.40	T
MetaSVM	Benign	-1.1	T
PROVEAN	Benign	0.21	N
REVEL	Benign	0.13
Sift	Benign	0.037	D
Sift4G	Uncertain	0.0070	D
Polyphen		0.60	P
Vest4		0.55
MutPred		0.35		Gain of solvent accessibility (P = 6e-04);
MVP		0.84
ClinPred		0.59	D
GERP RS		3.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.68		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.68		Position offset: -1

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

Publications

LitVar

Other links and lift over

dbSNP: rs778305085; hg19: chr15-44855496;