chr22-46335618-C-A

Position:

• chr22-46335618-C-A

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BS1_Supporting BS2

The ENST00000441818.5(TRMU):​c.-147C>A variant causes a 5 prime UTR, NMD transcript change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000622 in 918,576 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00097 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00055 (3 hom.)
• Consequence: TRMU ENST00000441818.5 5_prime_UTR, NMD_transcript
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: -0.106

Genes affected

TRMU (HGNC:25481): (tRNA mitochondrial 2-thiouridylase) This nuclear gene encodes a mitochondrial tRNA-modifying enzyme. The encoded protein catalyzes the 2-thiolation of uridine on the wobble positions of tRNA(Lys), tRNA(Glu), and tRNA(Gln), resulting in the formation of 5-taurinomethyl-2-thiouridine moieties. Mutations in this gene may cause transient infantile liver failure. Polymorphisms in this gene may also influence the severity of deafness caused by mitochondrial 12S ribosomal RNA mutations. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.71).
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000973 (148/152102) while in subpopulation AMR AF= 0.00399 (61/15290). AF 95% confidence interval is 0.00319. There are 0 homozygotes in gnomad4. There are 71 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAdExome4 at 3 Mitochondrial gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TRMU	ENST00000441818.5	c.-147C>A		5_prime_UTR_variant, NMD_transcript_variant	1/10	1
TRMU	ENST00000456595.5	c.-147C>A		5_prime_UTR_variant, NMD_transcript_variant	1/9	1
TRMU	ENST00000381021.7	c.-147C>A		5_prime_UTR_variant, NMD_transcript_variant	1/10	2

Frequencies

GnomAD3 genomes AF: 0.000980 AC: 149 AN: 151984 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00111

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00399

Gnomad ASJ AF: 0.00115

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0160

Gnomad NFE AF: 0.000383

Gnomad OTH AF: 0.00287

GnomAD4 exome AF: 0.000552 AC: 423 AN: 766474 Hom.: 3 Cov.: 10 AF XY: 0.000542 AC XY: 213 AN XY: 393142

Gnomad4 AFR exome AF: 0.00270

Gnomad4 AMR exome AF: 0.00360

Gnomad4 ASJ exome AF: 0.000718

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000178

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000346

Gnomad4 OTH exome AF: 0.00166

GnomAD4 genome AF: 0.000973 AC: 148 AN: 152102 Hom.: 0 Cov.: 33 AF XY: 0.000954 AC XY: 71 AN XY: 74390

Gnomad4 AFR AF: 0.00108

Gnomad4 AMR AF: 0.00399

Gnomad4 ASJ AF: 0.00115

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000383

Gnomad4 OTH AF: 0.00284

Alfa AF: 0.00104 Hom.: 0

Bravo AF: 0.00143

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Acute infantile liver failure due to synthesis defect of mtDNA-encoded proteins Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Aminoglycoside-induced deafness;C3278664:Acute infantile liver failure due to synthesis defect of mtDNA-encoded proteins Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Jul 17, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.71
CADD	Benign	2.3
DANN	Benign	0.67

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: rs190351151; hg19: chr22-46731515;