dbSNP rs573642949: SPAST:p.Glu43Gln (chr2-32063958-G-C) – ACMG Classification: Likely_benign (-6 pts)

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 1P and 7B. PP2BP4_ModerateBP6BS1

The NM_014946.4(SPAST):c.127G>C(p.Glu43Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000118 in 1,608,366 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E43D) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

SPAST
NM_014946.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: -0.0130

Publications

2 publications found

Variant links:

Genes affected

SPAST (HGNC:11233): (spastin) This gene encodes a member of the AAA (ATPases associated with a variety of cellular activities) protein 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. The use of alternative translational initiation sites in this gene results in a single transcript variant that can produce isoforms that differ in the length of their N-terminus and which thereby differ in the efficiency of their export from the nucleus to the cytoplasm. In addition, alternative splicing results in multiple transcript variants that encode isoforms that differ in other protein regions as well. One isoform of this gene has been shown to be a microtubule-severing enzyme that regulates microtubule abundance, mobility, and plus-end distribution. Mutations in this gene cause the most frequent form of autosomal dominant spastic paraplegia 4. [provided by RefSeq, May 2018]

SPAST Gene-Disease associations (from GenCC):

hereditary spastic paraplegia 4
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: PanelApp Australia, Orphanet, Genomics England PanelApp, Illumina, Labcorp Genetics (formerly Invitae), Ambry Genetics
Charlevoix-Saguenay spastic ataxia
Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
neurodevelopmental disorder
Inheritance: AD Classification: STRONG Submitted by: G2P
SPAST-related motor disorder
Inheritance: AR Classification: STRONG Submitted by: Ambry Genetics

SPAST links:

Genome browser will be placed here

new If you want to explore the variant's impact on the transcript NM_014946.4, check out the Mutation Effect Viewer. This is especially useful for frameshift variants or if you want to visualize the effect of exon loss / intron retention.

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 148 curated pathogenic missense variants (we use a threshold of 10). The gene has 21 curated benign missense variants. Gene score misZ: 1.2438 (below the threshold of 3.09). Trascript score misZ: 0.22274 (below the threshold of 3.09). GenCC associations: The gene is linked to hereditary spastic paraplegia 4, SPAST-related motor disorder, neurodevelopmental disorder, Charlevoix-Saguenay spastic ataxia.

BP4

Computational evidence support a benign effect (MetaRNN=0.123869956).

BP6

Variant 2-32063958-G-C is Benign according to our data. Variant chr2-32063958-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 2634603.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0000461 (7/151996) while in subpopulation AFR AF = 0.000169 (7/41484). AF 95% confidence interval is 0.0000788. There are 0 homozygotes in GnomAd4. There are 3 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_014946.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SPAST	NM_014946.4	MANE Select	c.127G>C	p.Glu43Gln	missense	Exon 1 of 17	NP_055761.2
SPAST	NM_001363823.2		c.127G>C	p.Glu43Gln	missense	Exon 1 of 17	NP_001350752.1	A0A2U3TZR0
SPAST	NM_199436.2		c.127G>C	p.Glu43Gln	missense	Exon 1 of 16	NP_955468.1	E5KRP6

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SPAST	ENST00000315285.9	TSL:1 MANE Select	c.127G>C	p.Glu43Gln	missense	Exon 1 of 17	ENSP00000320885.3	Q9UBP0-1
SPAST	ENST00000621856.2	TSL:1	c.127G>C	p.Glu43Gln	missense	Exon 1 of 17	ENSP00000482496.2	A0A2U3TZR0
SPAST	ENST00000713716.1		c.127G>C	p.Glu43Gln	missense	Exon 1 of 18	ENSP00000519019.1	A0AAQ5BGQ0

Frequencies

GnomAD3 genomes

AF:

0.0000461

AC:

AN:

151890

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000164

AC:

AN:

243490

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.000198

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000824

AC:

AN:

1456370

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

724376

show subpopulations

African (AFR)

AF:

0.000180

AC:

AN:

33250

American (AMR)

AF:

0.0000450

AC:

AN:

44486

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25926

East Asian (EAS)

AF:

0.00

AC:

AN:

39448

South Asian (SAS)

AF:

0.00

AC:

AN:

85942

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52344

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5620

European-Non Finnish (NFE)

AF:

0.00000361

AC:

AN:

1109306

Other (OTH)

AF:

0.00

AC:

AN:

60048

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:

0.0000461

AC:

AN:

151996

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74324

show subpopulations

African (AFR)

AF:

0.000169

AC:

AN:

41484

American (AMR)

AF:

0.00

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3462

East Asian (EAS)

AF:

0.00

AC:

AN:

5168

South Asian (SAS)

AF:

0.00

AC:

AN:

4806

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10536

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67930

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.489

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:

0.00

Hom.:

Bravo

AF:

0.0000378

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Hereditary spastic paraplegia 4 (1)

SPAST-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.072

BayesDel_addAF

Uncertain

0.015

BayesDel_noAF

Uncertain

0.060

CADD

Benign

7.8

(source)

DANN

Benign

0.39

DEOGEN2

Benign

0.16

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.041

LIST_S2

Benign

0.62

M_CAP

Pathogenic

0.57

MetaRNN

Benign

0.12

MetaSVM

Benign

-0.42

MutationAssessor

Benign

-0.34

PhyloP100

-0.013

PrimateAI

Uncertain

0.71

PROVEAN

Benign

0.060

REVEL

Uncertain

0.52

Sift

Benign

0.29

Sift4G

Benign

0.57

PromoterAI

-0.073

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.11

gMVP

0.23

Mutation Taster

=31/69

disease causing

(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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over