22-19935883-T-C

Variant names:

• chr22-19935883-T-C
• rs5746848
• NM_006440.5:c.104-4785A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_006440.5(TXNRD2):​c.104-4785A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.522 in 151,592 control chromosomes in the GnomAD database, including 20,780 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 0.52 (20780 hom., cov: 32)
• Consequence: TXNRD2 NM_006440.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -4.52
• Publications: 8 publications found

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]

TXNRD2 Gene-Disease associations (from GenCC):

• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial glucocorticoid deficiency

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• glucocorticoid deficiency 5

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000289946 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.99).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.672 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TXNRD2	NM_006440.5	c.104-4785A>G		intron_variant	Intron 1 of 17	ENST00000400521.7	NP_006431.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TXNRD2	ENST00000400521.7	c.104-4785A>G		intron_variant	Intron 1 of 17	1	NM_006440.5	ENSP00000383365.1

Frequencies

GnomAD3 genomes AF: 0.522 AC: 79047 AN: 151480 Hom.: 20765 Cov.: 32

Gnomad AFR AF: 0.480

Gnomad AMI AF: 0.462

Gnomad AMR AF: 0.592

Gnomad ASJ AF: 0.675

Gnomad EAS AF: 0.692

Gnomad SAS AF: 0.532

Gnomad FIN AF: 0.457

Gnomad MID AF: 0.551

Gnomad NFE AF: 0.520

Gnomad OTH AF: 0.553

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

GnomAD4 genome AF: 0.522 AC: 79105 AN: 151592 Hom.: 20780 Cov.: 32 AF XY: 0.524 AC XY: 38838 AN XY: 74064

African (AFR) AF: 0.480 AC: 19829 AN: 41304

American (AMR) AF: 0.592 AC: 9017 AN: 15234

Ashkenazi Jewish (ASJ) AF: 0.675 AC: 2334 AN: 3456

East Asian (EAS) AF: 0.691 AC: 3557 AN: 5150

South Asian (SAS) AF: 0.533 AC: 2564 AN: 4814

European-Finnish (FIN) AF: 0.457 AC: 4800 AN: 10504

Middle Eastern (MID) AF: 0.537 AC: 158 AN: 294

European-Non Finnish (NFE) AF: 0.520 AC: 35263 AN: 67832

Other (OTH) AF: 0.555 AC: 1167 AN: 2104

Alfa AF: 0.399 Hom.: 1146

Bravo AF: 0.531

Asia WGS AF: 0.602 AC: 2095 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.99
CADD	Benign	0.093
DANN	Benign	0.067
PhyloP100		-4.5
Mutation Taster		=100/0	polymorphism (auto)

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

Other links and lift over

dbSNP: rs5746848; hg19: chr22-19923406;