21-25592962-T-C

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_017446.4(MRPL39):c.771A>G(p.Ile257Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000649 in 1,586,910 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000072 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000064 ( 1 hom. )

Consequence

MRPL39
NM_017446.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.48

Variant links:

Genes affected

MRPL39 (HGNC:14027): (mitochondrial ribosomal protein L39) 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. Two transcript variants encoding distinct isoforms have been described. A pseudogene corresponding to this gene is found on chromosome 5q. [provided by RefSeq, Jul 2008]

MRPL39 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.13781193).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MRPL39	NM_017446.4 link	c.771A>G	p.Ile257Met	missense_variant	Exon 8 of 10	ENST00000352957.9	NP_059142.3	Q9NYK5-1
MRPL39	NM_080794.4 link	c.771A>G	p.Ile257Met	missense_variant	Exon 8 of 11		NP_542984.3	Q9NYK5-2
MRPL39	XM_006724026.5 link	c.771A>G	p.Ile257Met	missense_variant	Exon 8 of 10		XP_006724089.1	Q9NYK5-2
MRPL39	XM_011529651.3 link	c.645A>G	p.Ile215Met	missense_variant	Exon 8 of 10		XP_011527953.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MRPL39	ENST00000352957.9 link	c.771A>G	p.Ile257Met	missense_variant	Exon 8 of 10	1	NM_017446.4	ENSP00000284967.7	Q9NYK5-1
MRPL39	ENST00000307301.11 link	c.771A>G	p.Ile257Met	missense_variant	Exon 8 of 11	5		ENSP00000305682.7	Q9NYK5-2
MRPL39	ENST00000419219.1 link	c.741A>G	p.Ile247Met	missense_variant	Exon 8 of 8	5		ENSP00000404426.1	C9JG87

Frequencies

GnomAD3 genomes

AF:

0.0000723

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.000132

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000352

AC:

AN:

227210

Hom.:

AF XY:

0.0000406

AC XY:

AN XY:

123002

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000751

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000641

AC:

AN:

1434704

Hom.:

Cov.:

AF XY:

0.0000659

AC XY:

AN XY:

712894

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000541

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000798

Gnomad4 OTH exome

AF:

0.0000338

GnomAD4 genome

AF:

0.0000723

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74362

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000667

Hom.:

Bravo

AF:

0.0000718

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 16, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.771A>G (p.I257M) alteration is located in exon 8 (coding exon 8) of the MRPL39 gene. This alteration results from a A to G substitution at nucleotide position 771, causing the isoleucine (I) at amino acid position 257 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

0.066

BayesDel_addAF

Benign

-0.33

BayesDel_noAF

Benign

-0.53

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.013

T;.;T

Eigen

Benign

-0.68

Eigen_PC

Benign

-0.49

FATHMM_MKL

Uncertain

0.84

LIST_S2

Benign

0.64

T;T;T

M_CAP

Benign

0.0036

MetaRNN

Benign

0.14

T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

-0.080

N;N;.

PrimateAI

Benign

0.46

PROVEAN

Benign

-0.59

N;N;N

REVEL

Benign

0.046

Sift

Benign

0.26

T;T;T

Sift4G

Benign

0.16

T;T;T

Polyphen

0.0030

B;B;.

Vest4

0.30

MVP

0.23

MPC

0.040

ClinPred

0.045

GERP RS

1.6

Varity_R

0.13

gMVP

0.42

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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