22-19919573-C-A

Variant names:

• chr22-19919573-C-A
• rs372803804
• ENST00000542719.6:c.-90G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The ENST00000542719.6(TXNRD2):​c.-90G>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000142 in 1,412,008 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 27)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: TXNRD2 ENST00000542719.6 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.56
• Publications: 0 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)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TXNRD2	NM_006440.5	c.199G>T	p.Val67Leu	missense_variant	Exon 3 of 18	ENST00000400521.7	NP_006431.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TXNRD2	ENST00000400521.7	c.199G>T	p.Val67Leu	missense_variant	Exon 3 of 18	1	NM_006440.5	ENSP00000383365.1

Frequencies

GnomAD3 genomes Cov.: 27

GnomAD4 exome AF: 0.00000142 AC: 2 AN: 1412008 Hom.: 0 Cov.: 30 AF XY: 0.00000143 AC XY: 1 AN XY: 698002

African (AFR) AF: 0.00 AC: 0 AN: 32094

American (AMR) AF: 0.00 AC: 0 AN: 37020

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25258

East Asian (EAS) AF: 0.00 AC: 0 AN: 36064

South Asian (SAS) AF: 0.00 AC: 0 AN: 79872

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50178

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5716

European-Non Finnish (NFE) AF: 9.20e-7 AC: 1 AN: 1087218

Other (OTH) AF: 0.0000171 AC: 1 AN: 58588

GnomAD4 genome Cov.: 27

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.065	T
BayesDel_noAF	Benign	-0.14
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.13	.;.;.;T;T;.
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.98	.;.;.;D;D;D
M_CAP	Benign	0.020	T
MetaRNN	Uncertain	0.47	T;T;T;T;T;T
MetaSVM	Benign	-0.81	T
MutationAssessor	Benign	0.47	.;.;.;N;.;.
PhyloP100		3.6
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-2.5	N;N;N;N;.;N
REVEL	Benign	0.27
Sift	Benign	0.41	T;T;T;T;.;T
Sift4G	Benign	0.64	T;T;T;T;T;T
Polyphen		0.98, 0.98	.;.;.;D;.;D
Vest4		0.41
MutPred		0.54		.;.;.;Gain of sheet (P = 0.0827);.;Gain of sheet (P = 0.0827);
MVP		0.69
MPC		0.31
ClinPred		0.96	D
GERP RS		4.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.36
Mutation Taster		=54/46	polymorphism

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: rs372803804; hg19: chr22-19907096;