Genetic Variant SPATA18:p.Asp140Glu (chr4-52062330-C-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_145263.4(SPATA18):c.420C>G(p.Asp140Glu) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000139 in 1,585,982 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 Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000098 ( 0 hom. )

Consequence

SPATA18
NM_145263.4 missense, splice_region

Scores

Splicing: ADA: 0.9808

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.54

Variant links:

Genes affected

SPATA18 (HGNC:29579): (spermatogenesis associated 18) This gene encodes a p53-inducible protein that is able to induce lysosome-like organelles within mitochondria that eliminate oxidized mitochondrial proteins, thereby contributing to mitochondrial quality control. Dysregulation of mitochondrial quality control is associated with cancer and degenerative diseases. The encoded protein mediates accumulation of the lysosome-like mitochondrial organelles through interaction with B cell lymphoma 2 interacting protein 3 and B cell lymphoma 2 interacting protein 3 like at the outer mitochondrial membrane, which allows translocation of lysosomal proteins to the mitochondrial matrix from the cytosol. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2016]

SPATA18 links:

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ACMG classification

Classification made for transcript

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 rank	MANE	Protein	UniProt
SPATA18	NM_145263.4 link	c.420C>G	p.Asp140Glu	missense_variant, splice_region_variant	Exon 4 of 13	ENST00000295213.9	NP_660306.1	Q8TC71-1A0A140VKF4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPATA18	ENST00000295213.9 link	c.420C>G	p.Asp140Glu	missense_variant, splice_region_variant	Exon 4 of 13	1	NM_145263.4	ENSP00000295213.4		Q8TC71-1

Frequencies

GnomAD3 genomes

AF:

0.0000527

AC:

AN:

151706

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000194

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

GnomAD3 exomes

AF:

0.0000124

AC:

AN:

242308

Hom.:

AF XY:

0.00000764

AC XY:

AN XY:

130878

show subpopulations

Gnomad AFR exome

AF:

0.000125

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:

0.00000899

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000976

AC:

AN:

1434158

Hom.:

Cov.:

AF XY:

0.0000140

AC XY:

AN XY:

714210

show subpopulations

Gnomad4 AFR exome

AF:

0.000340

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:

0.00000183

Gnomad4 OTH exome

AF:

0.0000169

GnomAD4 genome

AF:

0.0000527

AC:

AN:

151824

Hom.:

Cov.:

AF XY:

0.0000270

AC XY:

AN XY:

74160

show subpopulations

Gnomad4 AFR

AF:

0.000193

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000604

ExAC

AF:

0.0000247

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 25, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.420C>G (p.D140E) alteration is located in exon 4 (coding exon 4) of the SPATA18 gene. This alteration results from a C to G substitution at nucleotide position 420, causing the aspartic acid (D) at amino acid position 140 to be replaced by a glutamic acid (E). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.13

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.033

T;.

Eigen

Uncertain

0.31

Eigen_PC

Uncertain

0.33

FATHMM_MKL

Benign

0.73

LIST_S2

Benign

0.52

T;T

M_CAP

Benign

0.061

MetaRNN

Benign

0.18

T;T

MetaSVM

Uncertain

-0.0029

MutationAssessor

Uncertain

2.4

M;M

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.99

N;N

REVEL

Uncertain

0.35

Sift

Benign

0.58

T;T

Sift4G

Benign

0.55

T;T

Polyphen

0.98

D;D

Vest4

0.40

MutPred

0.081

Loss of stability (P = 0.3319);Loss of stability (P = 0.3319);

MVP

0.45

MPC

0.63

ClinPred

0.67

GERP RS

4.3

Varity_R

0.065

gMVP

0.079

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.98

dbscSNV1_RF

Benign

0.72

SpliceAI score (max)

0.22

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.22

Position offset: 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