rs752623413

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PM1PP3_ModeratePP5_Very_Strong

The NM_003119.4(SPG7):c.2228T>C(p.Ile743Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000632 in 1,613,982 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 Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I743L) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000064 ( 0 hom. )

Consequence

SPG7
NM_003119.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:20O:1

Conservation

PhyloP100: 7.95

Publications

7 publications found

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 Gene-Disease associations (from GenCC):

hereditary spastic paraplegia 7
Inheritance: AR, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Laboratory for Molecular Medicine, G2P, Orphanet, Labcorp Genetics (formerly Invitae)
lateral sclerosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

SPG7 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 12 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 uncertain in NM_003119.4

PP3

MetaRNN computational evidence supports a deleterious effect, 0.907

PP5

Variant 16-89556933-T-C is Pathogenic according to our data. Variant chr16-89556933-T-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 215218.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
SPG7	NM_003119.4 link	c.2228T>C	p.Ile743Thr	missense_variant	Exon 17 of 17	ENST00000645818.2	NP_003110.1
SPG7	XM_047434540.1 link	c.914T>C	p.Ile305Thr	missense_variant	Exon 9 of 9		XP_047290496.1
SPG7	NM_001363850.1 link	c.*6T>C		3_prime_UTR_variant	Exon 18 of 18		NP_001350779.1
SPG7	XM_047434537.1 link	c.*6T>C		3_prime_UTR_variant	Exon 13 of 13		XP_047290493.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPG7	ENST00000645818.2 link	c.2228T>C	p.Ile743Thr	missense_variant	Exon 17 of 17		NM_003119.4	ENSP00000495795.2

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000517

AC:

AN:

251340

AF XY:

0.0000589

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.0000993

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000704

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000643

AC:

AN:

1461796

Hom.:

Cov.:

AF XY:

0.0000646

AC XY:

AN XY:

727196

show subpopulations

African (AFR)

AF:

0.0000597

AC:

AN:

33480

American (AMR)

AF:

0.0000224

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53348

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.0000647

AC:

AN:

1111988

Other (OTH)

AF:

0.000116

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152186

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74352

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41442

American (AMR)

AF:

0.0000654

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000882

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.419

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000778

Hom.:

Bravo

AF:

0.0000416

ExAC

AF:

0.0000494

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:20Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary spastic paraplegia 7

Pathogenic:14Other:1

Paris Brain Institute, Inserm - ICM

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nov 09, 2021

Institute of Human Genetics Munich, TUM University Hospital

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jan 01, 2022

PROSPAX: an integrated multimodal progression chart in spastic ataxias, Center for Neurology; Hertie-Institute for Clinical Brain Research

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

Jul 22, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 743 of the SPG7 protein (p.Ile743Thr). This variant is present in population databases (rs752623413, gnomAD 0.01%). This missense change has been observed in individuals with autosomal recessive primary lateral sclerosis and hereditary spastic paraplegia and adult-onset upper motor neuron syndrome, ataxia, or progressive external ophthalmoplegia (PMID: 18799786, 22964162, 24727571, 25681447, 27123479). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 215218). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt SPG7 protein function with a positive predictive value of 80%. For these reasons, this variant has been classified as Pathogenic.

May 17, 2017

Genetic Services Laboratory, University of Chicago

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

GenomeConnect, ClinGen

Significance:not provided

Review Status:no classification provided

Collection Method:phenotyping only

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.

Genomics England Pilot Project, Genomics England

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

Lifecell International Pvt. Ltd

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

A Heterozygous Missense variant c.2228T>C in Exon 17 of the SPG7 gene that results in the amino acid substitution p.Ile743Thr was identified. The observed variant has a minor allele frequency of 0.00005/0.00003% in gnomAD exomes and genomes, respectively. The severity of the impact of this variant on the protein is medium, based on the effect of the protein and REVEL score . Rare Exome Variant Ensemble Learner (REVEL) is an ensembl method for predicting the pathogenicity of missense variants based on a combination of scores from 13 individual tools: MutPred, FATHMM v2.3, VEST 3.0, PolyPhen-2, SIFT, PROVEAN, MutationAssessor, MutationTaster, LRT, GERP++, SiPhy, phyloP, and phastCons. The REVEL score for an individual missense variant can range from 0 to 1, with higher scores reflecting greater likelihood that the variant is disease-causing. ClinVar has also classified this variant as PathogenicLikelyPathogenic(Variant ID 215218). This variant has been previously reported in Pfeffer et al., 2015. Based on the above evidence this variant has been classified as Likely Pathogenic according to the ACMG guidelines.

Dec 21, 2021

MGZ Medical Genetics Center

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jul 22, 2023

Neuberg Centre For Genomic Medicine, NCGM

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The observed missense variant c.2228T>Cp.Ile743Thr in SPG7 gene has been reported in homozygous/compound heterozygous state in multiple individuals affected with Ataxia/Hereditary Spastic Paraplegia 7 Bogdanova-Mihaylova et al., 2021, Mancini et al., 2019. The p.Ile743Thr variant is reported with 0.005% allele freqeuncy in gnomAD Exomes. It has been submitted to ClinVar as Likely Pathogenic/ Pathogenic multiple submissions. Multiple lines of computational evidence Polyphen-probably damaging, SIFT-damaging and Mutation Taster-disease causing predict a damaging effect on protein structure and function for this variant. The amino acid Ile at position 743 is changed to a Thr changing protein sequence and it might alter its composition and physico-chemical properties. The reference amino acid p.Ile743Thr in SPG7 is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. However, experimental studies on the pathogenicity of the variant are not available. For these reasons, this variant has been classified as Pathogenic.

Sep 22, 2022

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: SPG7 c.2228T>C (p.Ile743Thr) results in a non-conservative amino acid change located in the Peptidase M41 domain (IPR000642) of the encoded protein sequence. Four of four in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 5.2e-05 in 251340 control chromosomes (gnomAD). c.2228T>C has been reported in the literature in multiple individuals affected with Ataxia/Hereditary Spastic Paraplegia 7 (e.g. van Gassen_2012, Coutelier_2018, Mancini_2019, Bogdanova-Mihaylova_2021). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Seven ClinVar submitters (evaluation after 2014) cite the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic.

Jul 13, 2024

Kariminejad - Najmabadi Pathology & Genetics Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PM2,PP3(Moderate),PP5(Strong),PM5,PP1,PS2,PS3(Supporting)

Jul 24, 2021

Genetics and Genomic Medicine Centre, NeuroGen Healthcare, NeuroGen Healthcare

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Mar 18, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Institute of Human Genetics, University Hospital of Duesseldorf

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:not provided

Spastic ataxia

Pathogenic:2

Jul 12, 2021

Molecular Medicine for Neurodegenerative and Neuromuscular Diseases Unit, IRCCS Fondazione Stella Maris

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

Tetreault Lab, University of Montreal Hospital Research Centre (CRCHUM)

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

Missense variant of SPG7 predicted that is predicted to disrupt the function of the mitochondrial metalloprotease. The allele frequency is low (gnomAD AF = 4.95e-5) but the variant has previously been reported multiple times (13) through ClinVar for Hereditary Spastic Paraplegia 7, and spastic ataxia. In silico predictions support loss-of-function of the allele (CADD = 25.4; SIFT = 0.99). The metalloprotease is important for mitochondrial function, which correlates with the mitochondrial-related phenotypes of associated condition. Causes Spastic ataxia with episodic manifestations in compound heterozygosity with NM_003119.4 c.1861C>T.

not provided

Pathogenic:2

May 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Nov 18, 2024

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 32816195, 34758253, 25681447, 22964162, 18799786, 29023604, 27790088, 29482223, 28362824, 30098094, 24727571, 33300680, 35869996, 34983064, 34445196, 35872528, 27123479)

SPG7-related disorder

Pathogenic:1

Jul 10, 2023

PreventionGenetics, part of Exact Sciences

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The SPG7 c.2228T>C variant is predicted to result in the amino acid substitution p.Ile743Thr. This variant has been reported in the compound heterozygous state in multiple individuals with spastic paraplegia, upper motor disease, or ataxia (Brugman et al. 2008. PubMed ID: 18799786; Pfeffer et al. 2015. PubMed ID: 25681447; Coutelier et al. 2018. PubMed ID: 29482223). This variant is reported in 0.0096% of alleles in individuals of Ashkenazi Jewish descent in gnomAD (http://gnomad.broadinstitute.org/variant/16-89623341-T-C). This variant has been classified as pathogenic or likely pathogenic by multiple independent submitters to the ClinVar database (https://www.ncbi.nlm.nih.gov/clinvar/variation/215218/). Given the evidence, we interpret c.2228T>C (p.Ile743Thr) as pathogenic for autosomal recessive disease.

Hereditary spastic paraplegia

Pathogenic:1

Mar 01, 2020

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.35

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Pathogenic

0.35

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0

.;.;D;.;.;.;.

Eigen

Pathogenic

0.70

Eigen_PC

Uncertain

0.59

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.96

D;D;D;D;D;D;D

M_CAP

Uncertain

0.25

MetaRNN

Pathogenic

0.91

D;D;D;D;D;D;D

MetaSVM

Uncertain

0.77

MutationAssessor

Benign

0.0

.;.;M;.;.;.;.

PhyloP100

7.9

PrimateAI

Uncertain

0.63

PROVEAN

Benign

0.0

.;.;.;.;.;.;.

REVEL

Benign

0.0

Sift

Pathogenic

0.0

.;.;.;.;.;.;.

Sift4G

Pathogenic

0.0

.;.;.;.;.;.;.

Vest4

0.0

ClinPred

0.80

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.83

gMVP

0.84

Mutation Taster

=22/78

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over