3-131462761-C-A

Variant names:

• chr3-131462761-C-A
• rs141422904
• NM_007208.4:c.1009G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_007208.4(MRPL3):​c.1009G>T​(p.Val337Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,320 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V337M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: MRPL3 NM_007208.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.127
• Publications: 0 publications found

Genes affected

MRPL3 (HGNC:10379): (mitochondrial ribosomal protein L3) 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 that belongs to the L3P ribosomal protein family. A pseudogene corresponding to this gene is found on chromosome 13q. [provided by RefSeq, Jul 2008]

MRPL3 Gene-Disease associations (from GenCC):

• combined oxidative phosphorylation defect type 9

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• mitochondrial disease

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.10646799).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007208.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MRPL3	NM_007208.4	MANE Select	c.1009G>T	p.Val337Leu	missense	Exon 10 of 10	NP_009139.1	P09001

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MRPL3	ENST00000264995.8	TSL:1 MANE Select	c.1009G>T	p.Val337Leu	missense	Exon 10 of 10	ENSP00000264995.2	P09001
	MRPL3	ENST00000425847.6	TSL:2	c.1090G>T	p.Val364Leu	missense	Exon 11 of 11	ENSP00000398536.2	E7ETU7
	MRPL3	ENST00000511168.5	TSL:2	c.1051G>T	p.Val351Leu	missense	Exon 10 of 10	ENSP00000424107.1	H0Y9G6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460320 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 726482

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33410

American (AMR) AF: 0.00 AC: 0 AN: 44594

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26068

East Asian (EAS) AF: 0.00 AC: 0 AN: 39648

South Asian (SAS) AF: 0.00 AC: 0 AN: 86094

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53370

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111076

Other (OTH) AF: 0.0000166 AC: 1 AN: 60300

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	3.6
DANN	Benign	0.95
DEOGEN2	Benign	0.021	T
Eigen	Benign	-0.61
Eigen_PC	Benign	-0.53
FATHMM_MKL	Benign	0.20	N
LIST_S2	Benign	0.69	T
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	1.4	L
PhyloP100		0.13
PrimateAI	Benign	0.44	T
PROVEAN	Benign	-0.50	N
REVEL	Benign	0.045
Sift	Benign	0.46	T
Sift4G	Benign	0.60	T
Polyphen		0.026	B
Vest4		0.11
MutPred		0.46		Gain of disorder (P = 0.0422)
MVP		0.82
MPC		0.066
ClinPred		0.20	T
GERP RS		3.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.096
gMVP		0.32
Mutation Taster		=82/18	polymorphism

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

Other links and lift over

dbSNP: rs141422904; hg19: chr3-131181605;