Genetic Variant NM_181514.2:c.16C>G (chr11-68903795-G-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_181514.2(MRPL21):c.16C>G(p.Leu6Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000725 in 1,379,606 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 7.2e-7 ( 0 hom. )

Consequence

MRPL21
NM_181514.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.202

Publications

0 publications found

Variant links:

Genes affected

MRPL21 (HGNC:14479): (mitochondrial ribosomal protein L21) 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. Multiple transcript variants encoding different isoforms were identified through sequence analysis although some may be subject to nonsense-mediated decay (NMD). [provided by RefSeq, Jul 2008]

MRPL21 links:

IGHMBP2 (HGNC:5542): (immunoglobulin mu DNA binding protein 2) This gene encodes a helicase superfamily member that binds a specific DNA sequence from the immunoglobulin mu chain switch region. Mutations in this gene lead to spinal muscle atrophy with respiratory distress type 1. [provided by RefSeq, Jul 2008]

IGHMBP2 Gene-Disease associations (from GenCC):

autosomal recessive distal spinal muscular atrophy 1
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Ambry Genetics, Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)
Charcot-Marie-Tooth disease axonal type 2S
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Laboratory for Molecular Medicine, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
hereditary peripheral neuropathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen

IGHMBP2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.066206455).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MRPL21	NM_181514.2 link	c.16C>G	p.Leu6Val	missense_variant	Exon 1 of 7	ENST00000362034.7	NP_852615.1	Q7Z2W9-1
IGHMBP2	NM_002180.3 link	c.-158G>C		upstream_gene_variant		ENST00000255078.8	NP_002171.2	P38935

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MRPL21	ENST00000362034.7 link	c.16C>G	p.Leu6Val	missense_variant	Exon 1 of 7	1	NM_181514.2	ENSP00000354580.2		Q7Z2W9-1
IGHMBP2	ENST00000255078.8 link	c.-158G>C		upstream_gene_variant		1	NM_002180.3	ENSP00000255078.4		P38935

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.25e-7

AC:

AN:

1379606

Hom.:

Cov.:

AF XY:

0.00000145

AC XY:

AN XY:

687856

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31488

American (AMR)

AF:

0.00

AC:

AN:

44018

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24666

East Asian (EAS)

AF:

0.00

AC:

AN:

38996

South Asian (SAS)

AF:

0.00

AC:

AN:

80456

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50646

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5428

European-Non Finnish (NFE)

AF:

9.56e-7

AC:

AN:

1046526

Other (OTH)

AF:

0.00

AC:

AN:

57382

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.063

BayesDel_addAF

Benign

-0.22

BayesDel_noAF

Benign

-0.55

CADD

Benign

0.88

(source)

DANN

Benign

0.67

DEOGEN2

Benign

0.0039

Eigen

Benign

-1.6

Eigen_PC

Benign

-1.7

FATHMM_MKL

Benign

0.0054

LIST_S2

Benign

0.52

M_CAP

Benign

0.0070

MetaRNN

Benign

0.066

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.5

PhyloP100

-0.20

PrimateAI

Benign

0.47

PROVEAN

Benign

-0.58

REVEL

Benign

0.019

Sift

Benign

0.11

Sift4G

Benign

0.28

Polyphen

0.0050

Vest4

0.19

MutPred

0.19

Gain of sheet (P = 0.0101);

MVP

0.13

MPC

0.17

ClinPred

0.15

GERP RS

-2.4

PromoterAI

0.14

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.037

gMVP

0.35

Mutation Taster

=97/3

polymorphism

(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

Computational scores

Splicing

Publications

Other links and lift over