3-131462825-T-C

Position:

• chr3-131462825-T-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_007208.4(MRPL3):​c.945A>G​(p.Pro315=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00197 in 1,612,888 control chromosomes in the GnomAD database, including 45 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.011 (22 hom., cov: 32)
  • Exomes 𝑓: 0.0011 (23 hom.)
• Consequence: MRPL3 NM_007208.4 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.748

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]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant 3-131462825-T-C is Benign according to our data. Variant chr3-131462825-T-C is described in ClinVar as [Benign]. Clinvar id is 386054.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-0.748 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0106 (1615/152280) while in subpopulation AFR AF= 0.0366 (1519/41546). AF 95% confidence interval is 0.035. There are 22 homozygotes in gnomad4. There are 801 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 22 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MRPL3	NM_007208.4	c.945A>G	p.Pro315=	synonymous_variant	10/10	ENST00000264995.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MRPL3	ENST00000264995.8	c.945A>G	p.Pro315=	synonymous_variant	10/10	1	NM_007208.4	P1
MRPL3	ENST00000425847.6	c.1026A>G	p.Pro342=	synonymous_variant	11/11	2
MRPL3	ENST00000511168.5	c.990A>G	p.Pro330=	synonymous_variant	10/10	2
MRPL3	ENST00000510043.1	n.369A>G		non_coding_transcript_exon_variant	4/4	2

Frequencies

GnomAD3 genomes AF: 0.0106 AC: 1613 AN: 152162 Hom.: 21 Cov.: 32

Gnomad AFR AF: 0.0366

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00446

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.0100

GnomAD3 exomes AF: 0.00276 AC: 692 AN: 250360 Hom.: 8 AF XY: 0.00203 AC XY: 275 AN XY: 135288

Gnomad AFR exome AF: 0.0369

Gnomad AMR exome AF: 0.00230

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000655

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000619

Gnomad OTH exome AF: 0.00115

GnomAD4 exome AF: 0.00107 AC: 1564 AN: 1460608 Hom.: 23 Cov.: 30 AF XY: 0.000907 AC XY: 659 AN XY: 726602

Gnomad4 AFR exome AF: 0.0375

Gnomad4 AMR exome AF: 0.00238

Gnomad4 ASJ exome AF: 0.0000384

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000697

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000630

Gnomad4 OTH exome AF: 0.00209

GnomAD4 genome AF: 0.0106 AC: 1615 AN: 152280 Hom.: 22 Cov.: 32 AF XY: 0.0108 AC XY: 801 AN XY: 74446

Gnomad4 AFR AF: 0.0366

Gnomad4 AMR AF: 0.00445

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00994

Alfa AF: 0.00537 Hom.: 11

Bravo AF: 0.0127

Asia WGS AF: 0.00173 AC: 6 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 15, 2024	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Jul 13, 2016

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	4.1
DANN	Benign	0.73
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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

LitVar

Other links and lift over

dbSNP: rs61731513; hg19: chr3-131181669;