NM_023936.2:c.322-10G>A

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PP3_ModeratePP5_Very_Strong

The NM_023936.2(MRPS34):c.322-10G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000212 in 1,604,034 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 Pathogenic (★★).

Frequency

Genomes: 𝑓 0.00015 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000076 ( 0 hom. )

Consequence

MRPS34
NM_023936.2 intron

Scores

Splicing: ADA: 0.9171

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 1.42

Publications

6 publications found

Variant links:

Genes affected

MRPS34 (HGNC:16618): (mitochondrial ribosomal protein S34) 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 28S subunit protein. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2014]

MRPS34 links:

EME2 (HGNC:27289): (essential meiotic structure-specific endonuclease subunit 2) EME2 forms a heterodimer with MUS81 (MIM 606591) that functions as an XPF (MIM 278760)-type flap/fork endonuclease in DNA repair (Ciccia et al., 2007 [PubMed 17289582]).[supplied by OMIM, Mar 2008]

EME2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 10 ACMG points.

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. Scorers claiming Benign: dbscSNV1_ADA.

PP5

Variant 16-1772656-C-T is Pathogenic according to our data. Variant chr16-1772656-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 438633.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein
MRPS34	NM_023936.2 link	c.322-10G>A	intron_variant	Intron 1 of 2	ENST00000397375.7	NP_076425.1
MRPS34	NM_001300900.2 link	c.322-10G>A	intron_variant	Intron 1 of 2		NP_001287829.1
EME2	NM_001257370.2 link	c.-572C>T	upstream_gene_variant		ENST00000568449.7	NP_001244299.1

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein
MRPS34	ENST00000397375.7 link	c.322-10G>A	intron_variant	Intron 1 of 2	1	NM_023936.2	ENSP00000380531.3
MRPS34	ENST00000177742.7 link	c.322-10G>A	intron_variant	Intron 1 of 2	1		ENSP00000177742.3
MRPS34	ENST00000569585.1 link	n.43G>A	non_coding_transcript_exon_variant	Exon 1 of 2	2
EME2	ENST00000568449.7 link	c.-572C>T	upstream_gene_variant		1	NM_001257370.2	ENSP00000457353.1

Frequencies

GnomAD3 genomes

AF:

0.000151

AC:

AN:

152266

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00131

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:

0.00144

GnomAD2 exomes

AF:

0.00000836

AC:

AN:

239276

AF XY:

0.00000761

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000291

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000168

GnomAD4 exome

AF:

0.00000758

AC:

AN:

1451650

Hom.:

Cov.:

AF XY:

0.00000554

AC XY:

AN XY:

722530

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33474

American (AMR)

AF:

0.000179

AC:

AN:

44620

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26098

East Asian (EAS)

AF:

0.00

AC:

AN:

39684

South Asian (SAS)

AF:

0.00

AC:

AN:

86184

European-Finnish (FIN)

AF:

0.00

AC:

AN:

43982

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5678

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111650

Other (OTH)

AF:

0.0000498

AC:

AN:

60280

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.511

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

AF:

0.000151

AC:

AN:

152384

Hom.:

Cov.:

AF XY:

0.000148

AC XY:

AN XY:

74518

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41590

American (AMR)

AF:

0.00131

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5192

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68042

Other (OTH)

AF:

0.00142

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.510

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.000374

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Combined oxidative phosphorylation deficiency 32

Pathogenic:4

Oct 21, 2022

Undiagnosed Diseases Network, NIH

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Sep 15, 2017

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Sep 27, 2022

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Sep 28, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: MRPS34 c.322-10G>A alters a non-conserved nucleotide located at a position not widely known to affect splicing. Several computational tools predict a significant impact on normal splicing: Two predict the variant abolishes the 3' canonical acceptor site. One predict the variant weakens the 3' canonical acceptor site. Four predict the variant creates a 3' cryptic acceptor site. At least one publication reports experimental evidence that this variant affects mRNA splicing by producing abnormal transcripts that result in frameshift and premature truncation, respectively (Lake_2017). The variant allele was found at a frequency of 8.4e-06 in 239276 control chromosomes. c.322-10G>A has been reported at a homozygous state in multiple individuals affected with Leigh Syndrome (examples, MartinSaavedra_2021, Alves_2020, Lake_2017). These data indicate that the variant is very likely to be associated with Combined Oxidative Phosphorylation Deficiency 32. The following publications have been ascertained in the context of this evaluation (PMID: 32445240, 28777931, 34052969). Five submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided

Pathogenic:2

Jan 08, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change falls in intron 1 of the MRPS34 gene. It does not directly change the encoded amino acid sequence of the MRPS34 protein. This variant is present in population databases (rs563189672, gnomAD 0.006%). This variant has been observed in individual(s) with combined oxidative phosphorylation deficiency (PMID: 28777931). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 438633). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -

Feb 19, 2022

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Published functional studies demonstrate abnormal splicing resulting in a frameshift and premature truncation with 75% reduction in transcript level (Lake et al., 2017); Not observed at a significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 28777931, 33314036, 30358850, 32445240) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.79

CADD

Benign

(source)

DANN

Benign

0.75

PhyloP100

1.4

PromoterAI

0.0088

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Mutation Taster

=33/67

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.92

dbscSNV1_RF

Pathogenic

0.96

SpliceAI score (max)

0.93

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.93

Position offset: -2

DS_AL_spliceai

0.73

Position offset: -10

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

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over