chr16-89510491-G-A

Position:

chr16-89510491-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_003119.4(SPG7):c.185G>A(p.Ser62Asn) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000778 in 1,451,550 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 18/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S62R) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000021 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000084 ( 0 hom. )

Consequence

SPG7
NM_003119.4 missense, splice_region

Scores

Splicing: ADA: 0.0002872

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 0.131

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:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.1024254).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPG7	NM_003119.4 linkuse as main transcript	c.185G>A	p.Ser62Asn	missense_variant, splice_region_variant	2/17	ENST00000645818.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPG7	ENST00000645818.2 linkuse as main transcript	c.185G>A	p.Ser62Asn	missense_variant, splice_region_variant	2/17		NM_003119.4	P2	Q9UQ90-1

Frequencies

GnomAD3 genomes

AF:

0.0000205

AC:

AN:

146048

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000449

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000128

AC:

AN:

234826

Hom.:

AF XY:

0.0000157

AC XY:

AN XY:

127280

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000278

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000843

AC:

110

AN:

1305502

Hom.:

Cov.:

AF XY:

0.0000778

AC XY:

AN XY:

655182

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000111

Gnomad4 OTH exome

AF:

0.0000182

GnomAD4 genome

AF:

0.0000205

AC:

AN:

146048

Hom.:

Cov.:

AF XY:

0.0000141

AC XY:

AN XY:

70698

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000449

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000301

Hom.:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jan 04, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Aug 19, 2021	- -

Hereditary spastic paraplegia 7

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 25, 2016

In summary, this variant is a rare missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: (SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). The asparagine amino acid residue is also found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies. This variant is present in population databases at a very low frequency ¬†(rs143294686, ExAC <0.01%) but has not been reported in the literature in individuals with a SPG7-related disease. This sequence change replaces serine with asparagine at codon 62 of the SPG7 protein (p.Ser62Asn). The serine residue is weakly conserved and there is a small physicochemical difference between serine and asparagine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.35

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.062

.;T;.;.;.;.;.;.;.;.;.

Eigen

Benign

-0.77

Eigen_PC

Benign

-0.68

FATHMM_MKL

Benign

0.16

LIST_S2

Benign

0.22

T;T;T;T;T;T;T;T;T;T;T

M_CAP

Benign

0.084

MetaRNN

Benign

0.10

T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.46

MutationAssessor

Benign

1.8

.;L;.;.;.;.;.;.;.;.;L

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.46

PROVEAN

Benign

-0.56

.;.;.;.;.;.;.;.;.;N;N

REVEL

Benign

0.18

Sift

Benign

0.21

.;.;.;.;.;.;.;.;.;T;T

Sift4G

Benign

0.54

.;.;.;.;.;.;.;.;.;T;T

Polyphen

0.0010, 0.0040

.;B;.;.;.;.;.;.;.;.;B

Vest4

0.33, 0.29

MVP

0.68

MPC

0.19

ClinPred

0.066

GERP RS

3.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.034

gMVP

0.36

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00029

dbscSNV1_RF

Benign

0.016

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