rs1800706

chr22-19940499-G-A

Variant summary

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

The NM_006440.5(TXNRD2):c.103+1202C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.219 in 152,014 control chromosomes in the GnomAD database, including 4,122 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 0.22 (4122 hom., cov: 31)
• Consequence: TXNRD2 NM_006440.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.252

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=-0.92).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.274 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TXNRD2	NM_006440.5	c.103+1202C>T		intron_variant		ENST00000400521.7
TXNRD2	NM_001282512.3	c.103+1202C>T		intron_variant
TXNRD2	NM_001352300.2	c.103+1202C>T		intron_variant
TXNRD2	NR_147957.2	n.118+1202C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TXNRD2	ENST00000400521.7	c.103+1202C>T		intron_variant		1	NM_006440.5	P4

Frequencies

GnomAD3 genomes AF: 0.219 AC: 33272 AN: 151896 Hom.: 4120 Cov.: 31

Gnomad AFR AF: 0.103

Gnomad AMI AF: 0.155

Gnomad AMR AF: 0.214

Gnomad ASJ AF: 0.426

Gnomad EAS AF: 0.277

Gnomad SAS AF: 0.263

Gnomad FIN AF: 0.190

Gnomad MID AF: 0.329

Gnomad NFE AF: 0.277

Gnomad OTH AF: 0.246

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

GnomAD4 genome AF: 0.219 AC: 33274 AN: 152014 Hom.: 4122 Cov.: 31 AF XY: 0.218 AC XY: 16187 AN XY: 74298

Gnomad4 AFR AF: 0.103

Gnomad4 AMR AF: 0.213

Gnomad4 ASJ AF: 0.426

Gnomad4 EAS AF: 0.276

Gnomad4 SAS AF: 0.264

Gnomad4 FIN AF: 0.190

Gnomad4 NFE AF: 0.277

Gnomad4 OTH AF: 0.247

Alfa AF: 0.276 Hom.: 7637

Bravo AF: 0.212

Asia WGS AF: 0.263 AC: 914 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
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: rs1800706; hg19: chr22-19928022;