M-3275-C-G

Variant names:

• chrM-3275-C-G
• rs1057516057
• unassigned_transcript_4788:c.46C>G

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP6_Moderate BS2

The ENST00000000000(TRNL1):​c.46C>G​(p.Gln16Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. 3/3 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Mitomap GenBank: 𝑓 0.00090 (AC: 55)
• Consequence: TRNL1 ENST00000000000 missense
• Scores: Mitotip Benign 2.0
• Clinical Significance: Likely benign criteria provided, single submitter B:1 No linked disesase in Mitomap
• Conservation: PhyloP100: -3.37
• Publications: 0 publications found

Genes affected

TRNL1 (HGNC:7490): (mitochondrially encoded tRNA leucine 1 (UUA/G)) Implicated in cardiomyopathy. [provided by Alliance of Genome Resources, Apr 2022]

MT-ND1 (HGNC:7455): (mitochondrially encoded NADH dehydrogenase 1) Enables NADH dehydrogenase (ubiquinone) activity. Involved in mitochondrial electron transport, NADH to ubiquinone and mitochondrial respiratory chain complex I assembly. Located in mitochondrial membrane. Part of mitochondrial respiratory chain complex I. Implicated in several diseases, including MELAS syndrome; neurodegenerative disease (multiple); optic nerve disease (multiple); toxic shock syndrome; and type 2 diabetes mellitus. Biomarker of Alzheimer's disease; Parkinson's disease; and multiple sclerosis. [provided by Alliance of Genome Resources, Apr 2022]

MT-RNR2 (HGNC:7471): (mitochondrially encoded 16S RNA) Enables G protein-coupled receptor binding activity; protein self-association; and receptor antagonist activity. Involved in several processes, including leukocyte chemotaxis; negative regulation of cell death; and negative regulation of neuroinflammatory response. Located in several cellular components, including mitochondrion; perinuclear region of cytoplasm; and sperm midpiece. [provided by Alliance of Genome Resources, Apr 2022]

MT-RNR2 Gene-Disease associations (from GenCC):

• mitochondrial disease

  Inheritance: Mitochondrial Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP6: Variant M-3275-C-G is Benign according to our data. Variant chrM-3275-C-G is described in ClinVar as Likely_benign. ClinVar VariationId is 689866.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS2: High AC in GnomadMitoHomoplasmic at 12

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRNL1	unassigned_transcript_4788	c.46C>G	p.Gln16Glu	missense_variant	Exon 1 of 1
ND1	unassigned_transcript_4789	c.-32C>G		upstream_gene_variant
RNR2	unassigned_transcript_4787	n.*46C>G		downstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MT-TL1	ENST00000386347.1	n.46C>G		non_coding_transcript_exon_variant	Exon 1 of 1	6
MT-ND1	ENST00000361390.2	c.-32C>G		upstream_gene_variant		6		ENSP00000354687.2
MT-RNR2	ENST00000387347.2	n.*46C>G		downstream_gene_variant		6

Frequencies

Mitomap GenBank AF: 0.00090 AC: 55

Gnomad homoplasmic AF: 0.00021 AC: 12 AN: 56434

Gnomad heteroplasmic AF: 0.0 AC: 0 AN: 56434

Alfa AF: 0.000445 Hom.: 2

Mitomap

No disease associated.

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

MELAS syndrome Benign:1

Jul 12, 2019

Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The NC_012920.1:m.3275C>G variant in MT-TL1 gene is interpreted to be a Likely Benign variant based on the modified ACMG guidelines (unpublished). This variant meets the following evidence codes reported in the guidelines: BS4, BP4 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
Mitotip	Benign	2.0
Hmtvar	Benign	0.0
PhyloP100		-3.4

Other links and lift over

dbSNP: rs1057516057; hg19: chrM-3276;