rs745459731

Positions:

• chr16-89532487-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_003119.4(SPG7):​c.1175G>A​(p.Ser392Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,262 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: SPG7 NM_003119.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.44

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SPG7	NM_003119.4	c.1175G>A	p.Ser392Asn	missense_variant	9/17	ENST00000645818.2	NP_003110.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SPG7	ENST00000645818.2	c.1175G>A	p.Ser392Asn	missense_variant	9/17		NM_003119.4	ENSP00000495795.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000805 AC: 2 AN: 248352 Hom.: 0 AF XY: 0.00000739 AC XY: 1 AN XY: 135234

Gnomad AFR exome AF: 0.0000664

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: 0.00000892

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461262 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 726926

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000508 Hom.: 0

Bravo AF: 0.0000151

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Athena Diagnostics

Feb 04, 2020

- -

Hereditary spastic paraplegia 7 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 16, 2023

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. 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 not expected to disrupt SPG7 protein function. ClinVar contains an entry for this variant (Variation ID: 465171). This variant has not been reported in the literature in individuals affected with SPG7-related conditions. This variant is present in population databases (rs745459731, gnomAD 0.007%). This sequence change replaces serine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 392 of the SPG7 protein (p.Ser392Asn). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Benign	-0.0029	T
BayesDel_noAF	Uncertain	-0.060
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.35	.;.;T;.;.;.;.;.;.
Eigen	Benign	0.034
Eigen_PC	Uncertain	0.23
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D;D;D;D;D;D;D;D
M_CAP	Uncertain	0.13	D
MetaRNN	Uncertain	0.66	D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.20	D
MutationAssessor	Benign	0.57	.;.;N;.;.;.;.;.;N
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-0.020	.;.;.;.;.;.;.;.;N
REVEL	Uncertain	0.49
Sift	Benign	0.091	.;.;.;.;.;.;.;.;T
Sift4G	Benign	0.15	.;.;.;.;.;.;.;.;T
Polyphen		0.13, 0.18	.;.;B;.;.;.;.;.;B
Vest4		0.81
MutPred		0.62		.;.;Loss of phosphorylation at S392 (P = 0.0283);Loss of phosphorylation at S392 (P = 0.0283);Loss of phosphorylation at S392 (P = 0.0283);Loss of phosphorylation at S392 (P = 0.0283);Loss of phosphorylation at S392 (P = 0.0283);.;Loss of phosphorylation at S392 (P = 0.0283);
MVP		0.83
MPC		0.74
ClinPred		0.56	D
GERP RS		5.6
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.6
Varity_R		0.36
gMVP		0.64

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

Other links and lift over

dbSNP: rs745459731; hg19: chr16-89598895;