9-136412089-T-C

Position:

chr9-136412089-T-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_015160.3(PMPCA):c.164T>C(p.Val55Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0000905 in 1,613,530 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00054 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000044 ( 0 hom. )

Consequence

PMPCA
NM_015160.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.64

Variant links:

Genes affected

PMPCA (HGNC:18667): (peptidase, mitochondrial processing subunit alpha) The protein encoded by this gene is found in the mitochondrion, where it represents the alpha subunit of a proteolytic heterodimer. This heterodimer is responsible for cleaving the transit peptide from nuclear-encoded mitochondrial proteins. Defects in this gene are a cause of spinocerebellar ataxia, autosomal recessive 2. [provided by RefSeq, Mar 2016]

PMPCA links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.012177974).

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000538 (82/152346) while in subpopulation AFR AF= 0.00195 (81/41586). AF 95% confidence interval is 0.00161. There are 0 homozygotes in gnomad4. There are 34 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
PMPCA	NM_015160.3 linkuse as main transcript	c.164T>C	p.Val55Ala	missense_variant	2/13	ENST00000371717.8
PMPCA	XM_005266059.4 linkuse as main transcript	c.164T>C	p.Val55Ala	missense_variant	2/12
PMPCA	NM_001282944.2 linkuse as main transcript	c.-135T>C		5_prime_UTR_variant	2/12
PMPCA	NM_001282946.2 linkuse as main transcript	c.-135T>C		5_prime_UTR_variant	2/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PMPCA	ENST00000371717.8 linkuse as main transcript	c.164T>C	p.Val55Ala	missense_variant	2/13	1	NM_015160.3	P1	Q10713-1

Frequencies

GnomAD3 genomes

AF:

0.000532

AC:

AN:

152228

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.000147

AC:

AN:

251464

Hom.:

AF XY:

0.0000809

AC XY:

AN XY:

135916

show subpopulations

Gnomad AFR exome

AF:

0.00203

Gnomad AMR exome

AF:

0.000116

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000438

AC:

AN:

1461184

Hom.:

Cov.:

AF XY:

0.0000385

AC XY:

AN XY:

726938

show subpopulations

Gnomad4 AFR exome

AF:

0.00140

Gnomad4 AMR exome

AF:

0.0000671

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:

0.00

Gnomad4 OTH exome

AF:

0.000166

GnomAD4 genome

AF:

0.000538

AC:

AN:

152346

Hom.:

Cov.:

AF XY:

0.000456

AC XY:

AN XY:

74490

show subpopulations

Gnomad4 AFR

AF:

0.00195

Gnomad4 AMR

AF:

0.0000654

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

Alfa

AF:

0.000131

Hom.:

Bravo

AF:

0.000597

ESP6500AA

AF:

0.00272

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000198

AC:

Asia WGS

AF:

0.00115

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 11, 2023

This sequence change replaces valine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 55 of the PMPCA protein (p.Val55Ala). This variant is present in population databases (rs113080564, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with PMPCA-related conditions. ClinVar contains an entry for this variant (Variation ID: 2051947). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.44

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.14

Eigen

Benign

-0.18

Eigen_PC

Benign

-0.050

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.54

M_CAP

Benign

0.0052

MetaRNN

Benign

0.012

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.8

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Benign

0.38

PROVEAN

Benign

-1.9

REVEL

Benign

0.080

Sift

Benign

0.41

Sift4G

Benign

0.50

Polyphen

0.0030

Vest4

0.14

MVP

0.30

MPC

0.18

ClinPred

0.022

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.099

gMVP

0.46

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

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