3-131468099-A-G

Variant names:

• chr3-131468099-A-G
• rs149305040
• NM_007208.4:c.886T>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.886T>C​(p.Leu296Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00203 in 1,561,654 control chromosomes in the GnomAD database, including 39 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.011 (26 hom., cov: 32)
  • Exomes 𝑓: 0.0011 (13 hom.)
• Consequence: MRPL3 NM_007208.4 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 1.30

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=-0.52).
• BP6: Variant 3-131468099-A-G is Benign according to our data. Variant chr3-131468099-A-G is described in ClinVar as [Benign]. Clinvar id is 380562.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=1.3 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0105 (1605/152148) while in subpopulation AFR AF= 0.0352 (1462/41544). AF 95% confidence interval is 0.0337. There are 26 homozygotes in gnomad4. There are 781 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 26 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MRPL3	NM_007208.4	c.886T>C	p.Leu296Leu	synonymous_variant	Exon 9 of 10	ENST00000264995.8	NP_009139.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MRPL3	ENST00000264995.8	c.886T>C	p.Leu296Leu	synonymous_variant	Exon 9 of 10	1	NM_007208.4	ENSP00000264995.2
MRPL3	ENST00000425847.6	c.967T>C	p.Leu323Leu	synonymous_variant	Exon 10 of 11	2		ENSP00000398536.2
MRPL3	ENST00000511168.5	c.928T>C	p.Leu310Leu	synonymous_variant	Exon 9 of 10	2		ENSP00000424107.1
MRPL3	ENST00000510043.1	n.310T>C		non_coding_transcript_exon_variant	Exon 3 of 4	2

Frequencies

GnomAD3 genomes AF: 0.0105 AC: 1603 AN: 152030 Hom.: 26 Cov.: 32

Gnomad AFR AF: 0.0352

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00570

Gnomad ASJ AF: 0.00346

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000250

Gnomad OTH AF: 0.0115

GnomAD3 exomes AF: 0.00277 AC: 595 AN: 214418 Hom.: 10 AF XY: 0.00228 AC XY: 266 AN XY: 116838

Gnomad AFR exome AF: 0.0340

Gnomad AMR exome AF: 0.00210

Gnomad ASJ exome AF: 0.00224

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000425

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000235

Gnomad OTH exome AF: 0.000811

GnomAD4 exome AF: 0.00111 AC: 1559 AN: 1409506 Hom.: 13 Cov.: 27 AF XY: 0.00105 AC XY: 739 AN XY: 701730

Gnomad4 AFR exome AF: 0.0358

Gnomad4 AMR exome AF: 0.00263

Gnomad4 ASJ exome AF: 0.00181

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000902

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000139

Gnomad4 OTH exome AF: 0.00279

GnomAD4 genome AF: 0.0105 AC: 1605 AN: 152148 Hom.: 26 Cov.: 32 AF XY: 0.0105 AC XY: 781 AN XY: 74402

Gnomad4 AFR AF: 0.0352

Gnomad4 AMR AF: 0.00570

Gnomad4 ASJ AF: 0.00346

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000250

Gnomad4 OTH AF: 0.0114

Alfa AF: 0.00538 Hom.: 7

Bravo AF: 0.0121

Asia WGS AF: 0.00203 AC: 7 AN: 3460

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Dec 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

not specified Benign:1

Feb 24, 2016

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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	-0.52
CADD	Benign	8.3
DANN	Benign	0.53

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: rs149305040; hg19: chr3-131186943;