Genetic Variant NM_015087.5:c.363C>A (chr13-36335468-G-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_015087.5(SPART):c.363C>A(p.Asp121Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,826 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D121Y) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

SPART
NM_015087.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.213

Publications

0 publications found

Variant links:

Genes affected

SPART (HGNC:18514): (spartin) This gene encodes a protein containing a MIT (Microtubule Interacting and Trafficking molecule) domain, and is implicated in regulating endosomal trafficking and mitochondria function. The protein localizes to mitochondria and partially co-localizes with microtubules. Stimulation with epidermal growth factor (EGF) results in protein translocation to the plasma membrane, and the protein functions in the degradation and intracellular trafficking of EGF receptor. Multiple alternatively spliced variants, encoding the same protein, have been identified. Mutations associated with this gene cause autosomal recessive spastic paraplegia 20 (Troyer syndrome). [provided by RefSeq, Nov 2008]

SPART Gene-Disease associations (from GenCC):

Troyer syndrome
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet

SPART links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.029888123).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015087.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SPART	NM_015087.5	MANE Select	c.363C>A	p.Asp121Glu	missense	Exon 2 of 9	NP_055902.1	Q8N0X7
SPART	NM_001142294.2		c.363C>A	p.Asp121Glu	missense	Exon 2 of 9	NP_001135766.1	Q8N0X7
SPART	NM_001142295.2		c.363C>A	p.Asp121Glu	missense	Exon 2 of 9	NP_001135767.1	Q8N0X7

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SPART	ENST00000438666.7	TSL:1 MANE Select	c.363C>A	p.Asp121Glu	missense	Exon 2 of 9	ENSP00000406061.2	Q8N0X7
SPART	ENST00000451493.5	TSL:1	c.363C>A	p.Asp121Glu	missense	Exon 2 of 9	ENSP00000414147.1	Q8N0X7
SPART	ENST00000494062.2	TSL:1	c.363C>A	p.Asp121Glu	missense	Exon 3 of 10	ENSP00000473599.1	Q8N0X7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461826

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727214

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44696

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111988

Other (OTH)

AF:

0.00

AC:

AN:

60392

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.275

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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.095

BayesDel_addAF

Benign

-0.22

BayesDel_noAF

Benign

-0.55

CADD

Benign

0.40

(source)

DANN

Benign

0.19

DEOGEN2

Benign

0.022

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.044

LIST_S2

Benign

0.58

M_CAP

Benign

0.026

MetaRNN

Benign

0.030

MetaSVM

Benign

-0.82

PhyloP100

-0.21

PrimateAI

Benign

0.29

PROVEAN

Benign

0.16

REVEL

Benign

0.14

Sift

Benign

1.0

Sift4G

Benign

1.0

Polyphen

0.0

Vest4

0.017

MutPred

0.28

Gain of catalytic residue at P118 (P = 0)

MVP

0.87

MPC

0.069

ClinPred

0.15

GERP RS

-0.78

Varity_R

0.021

gMVP

0.078

Mutation Taster

=96/4

polymorphism

(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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over