6-30619922-G-A

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_014046.4(MRPS18B):c.287G>A(p.Arg96His) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000589 in 1,614,094 control chromosomes in the GnomAD database, with no homozygous occurrence. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000058 ( 0 hom. )

Consequence

MRPS18B
NM_014046.4 missense, splice_region

Scores

Splicing: ADA: 0.9716

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.37

Variant links:

Genes affected

MRPS18B (HGNC:14516): (mitochondrial ribosomal protein S18B) 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 that belongs to the ribosomal protein S18P family. The encoded protein is one of three that has significant sequence similarity to bacterial S18 proteins. The primary sequences of the three human mitochondrial S18 proteins are no more closely related to each other than they are to the prokaryotic S18 proteins. Pseudogenes corresponding to this gene are found on chromosomes 1q and 2q. [provided by RefSeq, Jul 2008]

MRPS18B links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MRPS18B	NM_014046.4 link	c.287G>A	p.Arg96His	missense_variant, splice_region_variant	Exon 4 of 7	ENST00000259873.5	NP_054765.1	Q9Y676B0S7P4
MRPS18B	XM_024446408.2 link	c.287G>A	p.Arg96His	missense_variant, splice_region_variant	Exon 4 of 6		XP_024302176.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MRPS18B	ENST00000259873.5 link	c.287G>A	p.Arg96His	missense_variant, splice_region_variant	Exon 4 of 7	1	NM_014046.4	ENSP00000259873.4	Q9Y676
MRPS18B	ENST00000472267.5 link	n.522G>A		non_coding_transcript_exon_variant	Exon 2 of 5	1
MRPS18B	ENST00000472229.1 link	n.321G>A		splice_region_variant, non_coding_transcript_exon_variant	Exon 4 of 7	3
MRPS18B	ENST00000492316.5 link	n.310G>A		splice_region_variant, non_coding_transcript_exon_variant	Exon 4 of 4	2

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152124

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00154

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.0000944

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000175

AC:

AN:

251472

Hom.:

AF XY:

0.000155

AC XY:

AN XY:

135912

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00103

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000185

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000581

AC:

AN:

1461852

Hom.:

Cov.:

AF XY:

0.0000578

AC XY:

AN XY:

727230

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000856

Gnomad4 SAS exome

AF:

0.0000580

Gnomad4 FIN exome

AF:

0.0000749

Gnomad4 NFE exome

AF:

0.0000270

Gnomad4 OTH exome

AF:

0.000199

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152242

Hom.:

Cov.:

AF XY:

0.0000537

AC XY:

AN XY:

74440

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00154

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.0000944

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000616

Hom.:

Bravo

AF:

0.0000378

ExAC

AF:

0.000206

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 23, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.287G>A (p.R96H) alteration is located in exon 4 (coding exon 4) of the MRPS18B gene. This alteration results from a G to A substitution at nucleotide position 287, causing the arginine (R) at amino acid position 96 to be replaced by a histidine (H). 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

-0.19

BayesDel_noAF

Uncertain

-0.050

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.25

Eigen

Uncertain

0.65

Eigen_PC

Uncertain

0.57

FATHMM_MKL

Pathogenic

0.99

M_CAP

Benign

0.060

MetaRNN

Uncertain

0.52

MetaSVM

Benign

-0.71

MutationAssessor

Pathogenic

3.2

PrimateAI

Benign

0.46

PROVEAN

Uncertain

-4.1

REVEL

Uncertain

0.31

Sift

Benign

0.064

Sift4G

Uncertain

0.037

Polyphen

1.0

Vest4

0.77

MutPred

0.40

Loss of MoRF binding (P = 0.0175);

MVP

0.59

MPC

0.59

ClinPred

0.70

GERP RS

4.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.25

gMVP

0.64

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.97

dbscSNV1_RF

Pathogenic

0.81

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