rs768136171

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_003119.4(SPG7):c.773_774del(p.Val258GlyfsTer30) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000558 in 1,612,884 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

SPG7
NM_003119.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 0.284

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 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 16-89529488-CTG-C is Pathogenic according to our data. Variant chr16-89529488-CTG-C is described in ClinVar as [Pathogenic]. Clinvar id is 504920.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPG7	NM_003119.4 linkuse as main transcript	c.773_774del	p.Val258GlyfsTer30	frameshift_variant	6/17	ENST00000645818.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPG7	ENST00000645818.2 linkuse as main transcript	c.773_774del	p.Val258GlyfsTer30	frameshift_variant	6/17		NM_003119.4	P2	Q9UQ90-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152220

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.00000803

AC:

AN:

249210

Hom.:

AF XY:

0.00

AC XY:

AN XY:

134930

show subpopulations

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:

0.0000329

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.00000411

AC:

AN:

1460664

Hom.:

AF XY:

0.00000275

AC XY:

AN XY:

726648

show subpopulations

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:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000450

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152220

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74360

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000227

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary spastic paraplegia 7

Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Mar 24, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jan 15, 2024	This sequence change creates a premature translational stop signal (p.Val258Glyfs*30) in the SPG7 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SPG7 are known to be pathogenic (PMID: 21623769, 22964162). This variant is present in population databases (rs768136171, gnomAD 0.007%). This premature translational stop signal has been observed in individual(s) with autosomal recessive hereditary spastic paraplegia (PMID: 9635427). This variant is also known as 784del2. ClinVar contains an entry for this variant (Variation ID: 504920). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jun 12, 1998	- -

Hereditary spastic paraplegia

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 28, 2016

The p.Val258GlyfsX30 variant in SPG7 has been reported in one homozygous individ ual with spastic papaplegia (Casari 1998) and was identified in 2/105,040 of chr omosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.o rg). This variant causes a frameshift, which is predicted to alter the protein?s amino acid sequence beginning at position 258 and lead to a premature terminati on codon 30 amino acids downstream. This alteration is then predicted to lead to a truncated or absent protein. Variants causing loss of function in the SPG7 ge ne are associated with spastic paraplegia. In summary, this variant meets our cr iteria to be classified as pathogenic for spastic paraplegia in an autosomal rec essive manner based upon its predicted functional impact and homozygous case obs ervation. -

SPG7-related disorder

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 21, 2022

The SPG7 c.773_774delTG variant is predicted to result in a frameshift and premature protein termination (p.Val258Glyfs*30). This variant was reported in the homozygous and compound heterozygous states in patients with hereditary spastic paraplegia (Casari et al. 1998. PubMed ID: 9635427; da Graça et al. 2021. PubMed ID: 33956305; Table S2 in Mancini et al. 2019. PubMed ID: 30098094; Primiano et al. 2020. PubMed ID: 32317346). This variant was also found in a patient with dominant optic atrophy (Charif et al. 2020. PubMed ID: 32548275). This variant is reported in 0.0033% of alleles in individuals of South Asian descent in gnomAD (http://gnomad.broadinstitute.org/variant/16-89595896-CTG-C). Frameshift variants in SPG7 are expected to be pathogenic. This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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