rs774774648

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1PM2PP5

The NM_003119.4(SPG7):c.637C>T(p.Arg213Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000434 in 1,613,936 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 Conflicting classifications of pathogenicity (no stars). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000045 ( 0 hom. )

Consequence

SPG7
NM_003119.4 stop_gained

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:5U:1O:1

Conservation

PhyloP100: 2.76

Variant links:

Genes affected

SPG7 (HGNC:11237): (SPG7 matrix AAA peptidase subunit, paraplegin) This gene encodes a mitochondrial metalloprotease protein that is a member of the AAA family. Members of this protein family share an ATPase domain and have roles in diverse cellular processes including membrane trafficking, intracellular motility, organelle biogenesis, protein folding, and proteolysis. Mutations in this gene cause autosomal recessive spastic paraplegia 7. Two transcript variants encoding distinct isoforms have been identified. [provided by RefSeq, Mar 2014]

SPG7 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 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 16-89526347-C-T is Pathogenic according to our data. Variant chr16-89526347-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 285368.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=5, not_provided=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPG7	NM_003119.4 linkuse as main transcript	c.637C>T	p.Arg213Ter	stop_gained	5/17	ENST00000645818.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPG7	ENST00000645818.2 linkuse as main transcript	c.637C>T	p.Arg213Ter	stop_gained	5/17		NM_003119.4	P2	Q9UQ90-1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152084

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000795

AC:

AN:

251492

Hom.:

AF XY:

0.0000809

AC XY:

AN XY:

135918

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000298

Gnomad EAS exome

AF:

0.000381

Gnomad SAS exome

AF:

0.000131

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000527

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000451

AC:

AN:

1461852

Hom.:

Cov.:

AF XY:

0.0000495

AC XY:

AN XY:

727226

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.000383

Gnomad4 EAS exome

AF:

0.000101

Gnomad4 SAS exome

AF:

0.0000928

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.0000333

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152084

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74290

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000442

Hom.:

Bravo

AF:

0.0000264

ExAC

AF:

0.000115

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:5Uncertain:1Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary spastic paraplegia 7

Pathogenic:1Uncertain:1Other:1

not provided, no classification provided	phenotyping only	GenomeConnect, ClinGen	-	GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 11, 2019	The SPG7 c.637C>T (p.Arg213Ter) variant has been reported in one study and is found in one patient with hereditary spastic paraplegia in a compound heterozygous state (Mancini et al. 2019). Control data are unavailable for this variant, which is reported at a frequency of 0.000462 in the East Asian population of the Exome Aggregation Consortium. Based on the limited clinical evidence and the potential impact of stop-gained variants, the p.Arg213Ter variant is classified as a variant of unknown significance but suspicious for pathogenicity for autosomal recessive hereditary spastic paraplegia. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Feb 05, 2020	For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in SPG7 are known to be pathogenic (PMID: 14722615, 16357941). This variant has been observed in combination with another SPG7 variant in an individual with clinical features of hereditary spastic paraplegia (PMID: 30098094). ClinVar contains an entry for this variant (Variation ID: 285368). This variant is present in population databases (rs774774648, ExAC 0.05%). This sequence change creates a premature translational stop signal (p.Arg213*) in the SPG7 gene. It is expected to result in an absent or disrupted protein product. -

not provided

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Dec 14, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Nov 29, 2022	Identified in an individual with ataxia who harbored a second pathogenic SPG7 variant (Mancini et al., 2018); Identified in two individuals with cerebellar atrophy, one of whom was described to harbor a second pathogenic SPG7 variant (Lupo et al., 2020); Identified in an individual with sporadic amyotrophic lateral sclerosis (Kruger et al., 2016); Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 27790088, 32161564, 30098094, 34374492, 34507444) -

SPG7-related disorder

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 15, 2022

The SPG7 c.637C>T variant is predicted to result in premature protein termination (p.Arg213*). This variant has been documented in both the compound heterozygous and heterozygous states in patients with spastic paraplegia 7 (Patient Table S2 in Mancini et al. 2018. PubMed ID: 30098094; Patient CB_3 and CB_4 in Lupo et al. 2020. PubMed ID: 32161564), and found in the compound heterozygous state in a patient with parkinsonism (Bhattacharjee et al. 2021. PubMed ID: 34507444). This variant was also identified in the heterozygous state in a patient with ALS who also had an additional variant in the GARS gene (Patient 385 in Krüger et al. 2016. PubMed ID: 27790088). This variant is reported in 0.038% of alleles in individuals of East Asian descent in gnomAD (http://gnomad.broadinstitute.org/variant/16-89592755-C-T). Nonsense variants in SPG7 are expected to be pathogenic. This variant is interpreted as pathogenic. -

Hereditary spastic paraplegia

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Apr 01, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.31

BayesDel_noAF

Pathogenic

0.52

Cadd

Pathogenic

Dann

Uncertain

1.0

Eigen

Pathogenic

0.89

Eigen_PC

Pathogenic

0.74

FATHMM_MKL

Uncertain

0.82

MutationTaster

Benign

1.0

A;A

Vest4

0.92, 0.94

GERP RS

5.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.19

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over