chr22-19941704-C-T

Position:

• chr22-19941704-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006440.5(TXNRD2):​c.100G>A​(p.Ala34Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000751 in 1,331,596 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as drug response (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.5e-7 (0 hom.)
• Consequence: TXNRD2 NM_006440.5 missense
• Clinical Significance: drug response no assertion criteria provided O:1
• Conservation: PhyloP100: 2.22

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]

COMT (HGNC:2228): (catechol-O-methyltransferase) Catechol-O-methyltransferase catalyzes the transfer of a methyl group from S-adenosylmethionine to catecholamines, including the neurotransmitters dopamine, epinephrine, and norepinephrine. This O-methylation results in one of the major degradative pathways of the catecholamine transmitters. In addition to its role in the metabolism of endogenous substances, COMT is important in the metabolism of catechol drugs used in the treatment of hypertension, asthma, and Parkinson disease. COMT is found in two forms in tissues, a soluble form (S-COMT) and a membrane-bound form (MB-COMT). The differences between S-COMT and MB-COMT reside within the N-termini. Several transcript variants are formed through the use of alternative translation initiation sites and promoters. [provided by RefSeq, Sep 2008]

TXNRD2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20202872).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TXNRD2	NM_006440.5	c.100G>A	p.Ala34Thr	missense_variant	1/18	ENST00000400521.7	NP_006431.2
TXNRD2	NM_001352300.2	c.100G>A	p.Ala34Thr	missense_variant	1/17		NP_001339229.1
TXNRD2	NM_001282512.3	c.100G>A	p.Ala34Thr	missense_variant	1/12		NP_001269441.1
TXNRD2	NR_147957.2	n.115G>A		non_coding_transcript_exon_variant	1/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TXNRD2	ENST00000400521.7	c.100G>A	p.Ala34Thr	missense_variant	1/18	1	NM_006440.5	ENSP00000383365.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.51e-7 AC: 1 AN: 1331596 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 656646

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000135

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: drug response

Submissions summary: Other:1

Revision: no assertion criteria provided

Submissions by phenotype

Tramadol response Other:1

drug response, no assertion criteria provided

research

Bruce Budowle Laboratory, University of North Texas Health Science Center

Apr 28, 2018

- T:M1 = postmortem ratio or tramadol to O-desmethyltramadol; t-MP = model-based clustered metabolizer phenotype inferred from T:M1

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	16
DANN	Uncertain	0.98
DEOGEN2	Benign	0.043	.;.;T;.
Eigen	Benign	-0.79
Eigen_PC	Benign	-0.87
FATHMM_MKL	Benign	0.088	N
LIST_S2	Benign	0.37	.;.;T;T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.13	T;T;T;T
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	0.0	.;.;N;.
MutationTaster	Benign	0.71	D;N;N;N;N;N
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	-0.45	N;N;N;N
REVEL	Benign	0.073
Sift	Benign	0.32	T;D;T;T
Sift4G	Benign	0.39	T;D;T;T
Polyphen		0.78, 0.86	.;.;P;P
Vest4		0.23
MutPred		0.32		Gain of phosphorylation at A34 (P = 0.0483);Gain of phosphorylation at A34 (P = 0.0483);Gain of phosphorylation at A34 (P = 0.0483);Gain of phosphorylation at A34 (P = 0.0483);
MVP		0.49
MPC		0.25
ClinPred		0.15	T
GERP RS		1.3
Varity_R		0.055

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: rs1303813995; hg19: chr22-19929227;