chr11-68900593-G-A

Position:

• chr11-68900593-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_181515.2(MRPL21):​c.-168C>T variant causes a 5 prime UTR premature start codon gain change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts 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: 33)
• Consequence: MRPL21 NM_181515.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.23

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]

ACMG classification

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=0.23131078).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MRPL21	NM_181514.2	c.101C>T	p.Ser34Phe	missense_variant	2/7	ENST00000362034.7	NP_852615.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MRPL21	ENST00000362034.7	c.101C>T	p.Ser34Phe	missense_variant	2/7	1	NM_181514.2	ENSP00000354580.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 02, 2024

The c.101C>T (p.S34F) alteration is located in exon 2 (coding exon 2) of the MRPL21 gene. This alteration results from a C to T substitution at nucleotide position 101, causing the serine (S) at amino acid position 34 to be replaced by a phenylalanine (F). 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	0.12
BayesDel_addAF	Benign	-0.062	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.020	T
Eigen	Benign	-0.14
Eigen_PC	Benign	-0.13
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.75	T
M_CAP	Benign	0.0070	T
MetaRNN	Benign	0.23	T
MetaSVM	Benign	-0.57	T
MutationAssessor	Uncertain	2.5	M
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-2.2	N
REVEL	Benign	0.14
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.038	D
Polyphen		0.031	B
Vest4		0.49
MutPred		0.30		Loss of disorder (P = 0.0067);
MVP		0.29
MPC		0.61
ClinPred		0.92	D
GERP RS		3.0
Varity_R		0.11
gMVP		0.56

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.10		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr11-68668061;