6-166365442-G-A

Position:

chr6-166365442-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The NM_016098.4(MPC1):c.317C>T(p.Thr106Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000234 in 1,580,652 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. T106T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000023 ( 0 hom. )

Consequence

MPC1
NM_016098.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 0.849

Variant links:

Genes affected

MPC1 (HGNC:21606): (mitochondrial pyruvate carrier 1) The protein encoded by this gene is part of an MPC1/MPC2 heterodimer that is responsible for transporting pyruvate into mitochondria. The encoded protein is found in the inner mitochondrial membrane. Defects in this gene are a cause of mitochondrial pyruvate carrier deficiency. Several transcript variants, some protein coding and one non-protein coding, have been found for this gene. [provided by RefSeq, Aug 2012]

MPC1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a topological_domain Mitochondrial matrix (size 37) in uniprot entity MPC1_HUMAN there are 4 pathogenic changes around while only 1 benign (80%) in NM_016098.4

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.110057205).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MPC1	NM_016098.4 linkuse as main transcript	c.317C>T	p.Thr106Met	missense_variant	5/5	ENST00000360961.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MPC1	ENST00000360961.11 linkuse as main transcript	c.317C>T	p.Thr106Met	missense_variant	5/5	5	NM_016098.4	P3

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152130

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000280

AC:

AN:

214006

Hom.:

AF XY:

0.0000432

AC XY:

AN XY:

115818

show subpopulations

Gnomad AFR exome

AF:

0.0000728

Gnomad AMR exome

AF:

0.0000334

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000182

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000107

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000231

AC:

AN:

1428522

Hom.:

Cov.:

AF XY:

0.0000226

AC XY:

AN XY:

709518

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000245

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000181

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000219

Gnomad4 OTH exome

AF:

0.0000170

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152130

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74300

show subpopulations

Gnomad4 AFR

AF:

0.0000724

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000211

Hom.:

Bravo

AF:

0.0000378

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000248

AC:

Asia WGS

AF:

0.000866

AC:

AN:

3478

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	Labcorp Genetics (formerly Invitae), Labcorp	Aug 17, 2023	This variant has not been reported in the literature in individuals affected with MPC1-related conditions. 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. 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 disruptive. ClinVar contains an entry for this variant (Variation ID: 214658). This variant is present in population databases (rs139163077, gnomAD 0.02%). This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 106 of the MPC1 protein (p.Thr106Met). -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Apr 06, 2017	p.Thr106Met (ACG>ATG): c.317 C>T in exon 5 of the MPC1 gene (NM_016098.3). The T106M variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. The T106M variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is not conserved across species. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic mutation or a rare benign variant. The variant is found in MITONUC-MITOP panel(s). -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 26, 2023

The c.317C>T (p.T106M) alteration is located in exon 5 (coding exon 5) of the MPC1 gene. This alteration results from a C to T substitution at nucleotide position 317, causing the threonine (T) at amino acid position 106 to be replaced by a methionine (M). 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

0.20

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.32

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.44

T;T;T;T

Eigen

Benign

-0.31

Eigen_PC

Benign

-0.39

FATHMM_MKL

Benign

0.000060

LIST_S2

Benign

0.50

T;.;T;T

M_CAP

Benign

0.026

MetaRNN

Benign

0.11

T;T;T;T

MetaSVM

Benign

-0.92

MutationAssessor

Benign

1.1

L;.;.;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.41

PROVEAN

Benign

-1.2

N;.;.;.

REVEL

Benign

0.18

Sift

Uncertain

0.026

D;.;.;.

Sift4G

Benign

0.10

T;T;T;T

Polyphen

0.87

P;.;.;.

Vest4

0.087

MVP

0.44

MPC

1.0

ClinPred

0.080

GERP RS

2.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.026

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