Genetic Variant MRPL23:p.Val65Met (chr11-1952179-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PP3_Moderate

The NM_021134.4(MRPL23):c.193G>A(p.Val65Met) variant causes a missense change involving the alteration of a conserved nucleotide. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 1)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

MRPL23
NM_021134.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.71

Publications

0 publications found

Variant links:

Genes affected

MRPL23 (HGNC:10322): (mitochondrial ribosomal protein L23) Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence homology. This gene encodes a 39S subunit protein. The gene is biallelically expressed, despite its location within a region of imprinted genes on chromosome 11. [provided by RefSeq, Jul 2008]

MRPL23 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.865

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MRPL23	NM_021134.4 link	c.193G>A	p.Val65Met	missense_variant	Exon 3 of 5	ENST00000397298.8	NP_066957.3	Q16540A0A024RCB2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MRPL23	ENST00000397298.8 link	c.193G>A	p.Val65Met	missense_variant	Exon 3 of 5	1	NM_021134.4	ENSP00000380466.3		Q16540

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000119

AC:

AN:

251178

AF XY:

0.0000221

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.00000619

AC:

AN:

161600

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

84872

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:

2696

American (AMR)

AF:

0.00

AC:

AN:

5312

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

4918

East Asian (EAS)

AF:

0.000158

AC:

AN:

6334

South Asian (SAS)

AF:

0.00

AC:

AN:

15006

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10744

Middle Eastern (MID)

AF:

0.00

AC:

AN:

696

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

106728

Other (OTH)

AF:

0.00

AC:

AN:

9166

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 25, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.193G>A (p.V65M) alteration is located in exon 3 (coding exon 3) of the MRPL23 gene. This alteration results from a G to A substitution at nucleotide position 193, causing the valine (V) at amino acid position 65 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

Pathogenic

0.67

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.21

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.34

T;T;T;T;T

Eigen

Uncertain

0.57

Eigen_PC

Uncertain

0.36

FATHMM_MKL

Uncertain

0.94

LIST_S2

Pathogenic

0.98

.;D;D;D;D

M_CAP

Uncertain

0.13

MetaRNN

Pathogenic

0.87

D;D;D;D;D

MetaSVM

Uncertain

0.17

MutationAssessor

Pathogenic

3.7

H;H;.;.;.

PhyloP100

7.7

PrimateAI

Uncertain

0.69

PROVEAN

Uncertain

-2.5

D;D;D;N;D

REVEL

Uncertain

0.51

Sift

Uncertain

0.0040

D;D;D;D;D

Sift4G

Pathogenic

0.0010

D;D;D;D;D

Polyphen

1.0

D;D;.;.;.

Vest4

0.82

MVP

0.47

MPC

0.69

ClinPred

0.97

GERP RS

2.9

Varity_R

0.89

gMVP

0.66

Mutation Taster

=43/57

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over