Genetic Variant MRPL18:p.Arg75Leu (chr6-159791111-G-T) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_014161.5(MRPL18):c.224G>T(p.Arg75Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,860 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

MRPL18
NM_014161.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.06

Variant links:

Genes affected

MRPL18 (HGNC:14477): (mitochondrial ribosomal protein L18) This nuclear gene encodes a protein component of the larger 39S subunit of mitochondrial ribosome. This protein may also aid in the import of nuclear-encoded 5S rRNA into mitochondria. Alternative splicing results in multiple transcript variants, most of which are not predicted to encode a protein. A pseudogene of this gene is found on chromosome 16. [provided by RefSeq, Jan 2016]

MRPL18 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.785

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MRPL18	NM_014161.5 link	c.224G>T	p.Arg75Leu	missense_variant	Exon 2 of 4	ENST00000367034.5	NP_054880.2	Q9H0U6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MRPL18	ENST00000367034.5 link	c.224G>T	p.Arg75Leu	missense_variant	Exon 2 of 4	1	NM_014161.5	ENSP00000356001.4	Q9H0U6
MRPL18	ENST00000476826.5 link	n.249G>T		non_coding_transcript_exon_variant	Exon 2 of 4	3
MRPL18	ENST00000479638.5 link	n.467G>T		non_coding_transcript_exon_variant	Exon 3 of 4	5
MRPL18	ENST00000480842.1 link	n.443G>T		non_coding_transcript_exon_variant	Exon 2 of 4	3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000400

AC:

AN:

249928

Hom.:

AF XY:

0.00000738

AC XY:

AN XY:

135528

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 SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000616

AC:

AN:

1461860

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

727226

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000629

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000378

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 28, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.224G>T (p.R75L) alteration is located in exon 2 (coding exon 2) of the MRPL18 gene. This alteration results from a G to T substitution at nucleotide position 224, causing the arginine (R) at amino acid position 75 to be replaced by a leucine (L). 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

0.21

BayesDel_addAF

Benign

-0.028

BayesDel_noAF

Benign

-0.18

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.26

Eigen

Uncertain

0.19

Eigen_PC

Benign

0.097

FATHMM_MKL

Benign

0.69

LIST_S2

Uncertain

0.87

M_CAP

Uncertain

0.15

MetaRNN

Pathogenic

0.78

MetaSVM

Benign

-0.68

MutationAssessor

Benign

1.6

PrimateAI

Benign

0.45

PROVEAN

Uncertain

-4.2

REVEL

Uncertain

0.36

Sift

Uncertain

0.028

Sift4G

Uncertain

0.021

Polyphen

0.94

Vest4

0.85

MutPred

0.50

Loss of solvent accessibility (P = 0.089);

MVP

0.73

MPC

0.64

ClinPred

0.96

GERP RS

4.3

Varity_R

0.58

gMVP

0.44

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