M-621-A-G

Position:

• chrM-621-A-G

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2 BP4 BP6_Moderate

The ENST00000387314.1(MT-TF):​n.45A>G variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Mitomap GenBank: 𝑓 0.0 (AC: 1)
• Consequence: MT-TF ENST00000387314.1 non_coding_transcript_exon
• Scores: Mitotip Uncertain 8.5
• Clinical Significance: Likely benign criteria provided, single submitter B:1 No linked disesase in Mitomap
• Conservation: PhyloP100: 3.10

Genes affected

MT-TF (HGNC:7481): (mitochondrially encoded tRNA phenylalanine)

TRNF (HGNC:):

MT-RNR1 (HGNC:7470): (mitochondrially encoded 12S RNA) Enables DNA binding activity and DNA-binding transcription factor binding activity. Involved in several processes, including osteoblast proliferation; regulation of carbohydrate utilization; and regulation of phosphate metabolic process. Located in extracellular space; mitochondrion; and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very low frequency in mitomap database: 0.0
• BP4: Mitotip and hmtvar scores support benign criterium.
• BP6: Variant M-621-A-G is Benign according to our data. Variant chrM-621-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 689820.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TRNF	TRNF.1	n.45A>G		non_coding_transcript_exon_variant	1/1
RNR1	RNR1.1			upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MT-TF	ENST00000387314.1	n.45A>G		non_coding_transcript_exon_variant	1/1
MT-RNR1	ENST00000389680.2			upstream_gene_variant

Frequencies

GnomAD4 exome Cov.: 0

We have no GnomAD4 genomes data on this position. Probably position not covered by the project.

Mitomap GenBank AF: 0.0 AC: 1

Gnomad homoplasmic AF: 0.000035 AC: 2 AN: 56433

Gnomad heteroplasmic AF: 0.000018 AC: 1 AN: 56433

Mitomap

No disease associated.

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Juvenile myopathy, encephalopathy, lactic acidosis AND stroke Benign:1

Likely benign, criteria provided, single submitter

clinical testing

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

Jul 12, 2019

The NC_012920.1:m.621A>G variant in MT-TF 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: BP4, BP6 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
Mitotip	Uncertain	8.5
Hmtvar	Benign	0.15

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1603218463; hg19: chrM-623;