22-19924492-T-C

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_006440.5(TXNRD2):c.173-4893A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.809 in 151,994 control chromosomes in the GnomAD database, including 50,032 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.81 (50032 hom., cov: 30)
• Consequence: TXNRD2 NM_006440.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.928

Genes affected

TXNRD2 (HGNC:18155): (thioredoxin reductase 2) The protein encoded by this gene belongs to the pyridine nucleotide-disulfide oxidoreductase family, and is a member of the thioredoxin (Trx) system. Three thioredoxin reductase (TrxR) isozymes are found in mammals. TrxRs are selenocysteine-containing flavoenzymes, which reduce thioredoxins, as well as other substrates, and play a key role in redox homoeostasis. This gene encodes a mitochondrial form important for scavenging reactive oxygen species in mitochondria. It functions as a homodimer containing FAD, and selenocysteine (Sec) at the active site. Sec is encoded by UGA codon that normally signals translation termination. The 3' UTRs of selenoprotein mRNAs contain a conserved stem-loop structure, the Sec insertion sequence (SECIS) element, which is necessary for the recognition of UGA as a Sec codon rather than as a stop signal. Alternatively spliced transcript variants encoding different isoforms, including a few localized in the cytosol and some lacking the C-terminal Sec residue, have been found for this gene. [provided by RefSeq, Jun 2017]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.03).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.862 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TXNRD2	NM_006440.5	c.173-4893A>G		intron_variant		ENST00000400521.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TXNRD2	ENST00000400521.7	c.173-4893A>G		intron_variant		1	NM_006440.5	P4

Frequencies

GnomAD3 genomes AF: 0.809 AC: 122844 AN: 151876 Hom.: 49971 Cov.: 30

Gnomad AFR AF: 0.869

Gnomad AMI AF: 0.768

Gnomad AMR AF: 0.860

Gnomad ASJ AF: 0.809

Gnomad EAS AF: 0.777

Gnomad SAS AF: 0.841

Gnomad FIN AF: 0.811

Gnomad MID AF: 0.748

Gnomad NFE AF: 0.761

Gnomad OTH AF: 0.813

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

GnomAD4 genome AF: 0.809 AC: 122961 AN: 151994 Hom.: 50032 Cov.: 30 AF XY: 0.812 AC XY: 60320 AN XY: 74278

Gnomad4 AFR AF: 0.870

Gnomad4 AMR AF: 0.860

Gnomad4 ASJ AF: 0.809

Gnomad4 EAS AF: 0.776

Gnomad4 SAS AF: 0.843

Gnomad4 FIN AF: 0.811

Gnomad4 NFE AF: 0.761

Gnomad4 OTH AF: 0.813

Alfa AF: 0.778 Hom.: 29275

Bravo AF: 0.814

Asia WGS AF: 0.801 AC: 2785 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
Cadd	Benign	1.6
Dann	Benign	0.34

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: rs9306229; hg19: chr22-19912015;