19-17306201-A-G

Position:

• chr19-17306201-A-G

Variant summary

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

The NM_023937.4(MRPL34):​c.101A>G​(p.Asp34Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: MRPL34 NM_023937.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.960

Genes affected

MRPL34 (HGNC:14488): (mitochondrial ribosomal protein L34) 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. [provided by RefSeq, Jul 2008]

ABHD8 (HGNC:23759): (abhydrolase domain containing 8) This gene is upstream of, and in a head-to-head orientation with the gene for the mitochondrial ribosomal protein L34. The predicted protein contains alpha/beta hydrolase fold and secretory lipase domains. [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=0.073803544).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MRPL34	NM_023937.4	c.101A>G	p.Asp34Gly	missense_variant	2/2	ENST00000252602.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MRPL34	ENST00000252602.2	c.101A>G	p.Asp34Gly	missense_variant	2/2	1	NM_023937.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

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

Jun 11, 2021

The c.101A>G (p.D34G) alteration is located in exon 2 (coding exon 2) of the MRPL34 gene. This alteration results from a A to G substitution at nucleotide position 101, causing the aspartic acid (D) at amino acid position 34 to be replaced by a glycine (G). 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	0.079
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Benign	19
DANN	Benign	0.92
DEOGEN2	Benign	0.026	.;T;T;T
Eigen	Benign	-0.98
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.047	N
LIST_S2	Benign	0.63	T;.;.;T
M_CAP	Benign	0.0046	T
MetaRNN	Benign	0.074	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	1.0	N
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	-0.25	.;.;.;N
REVEL	Benign	0.027
Sift	Benign	0.14	.;.;.;T
Sift4G	Benign	0.098	T;T;T;T
Polyphen		0.0010	.;B;B;B
Vest4		0.20
MutPred		0.21		.;Gain of MoRF binding (P = 0.0476);Gain of MoRF binding (P = 0.0476);Gain of MoRF binding (P = 0.0476);
MVP		0.040
MPC		0.62
ClinPred		0.16	T
GERP RS		1.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.060
gMVP		0.29

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: chr19-17417010;