NM_006440.5:c.103G>C

Variant names:

• chr22-19941701-C-G
• rs1941724119
• NM_006440.5:c.103G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_006440.5(TXNRD2):​c.103G>C​(p.Ala35Pro) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000131 in 152,134 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A35V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TXNRD2 NM_006440.5 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.790
• 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]

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]

COMT Gene-Disease associations (from GenCC):

• paroxysmal dyskinesia

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006440.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TXNRD2	NM_006440.5	MANE Select	c.103G>C	p.Ala35Pro	missense splice_region	Exon 1 of 18	NP_006431.2
	TXNRD2	NM_001352300.2		c.103G>C	p.Gly35Arg	missense splice_region	Exon 1 of 17	NP_001339229.1
	TXNRD2	NM_001282512.3		c.103G>C	p.Ala35Pro	missense splice_region	Exon 1 of 12	NP_001269441.1	E7EWK1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TXNRD2	ENST00000400521.7	TSL:1 MANE Select	c.103G>C	p.Ala35Pro	missense splice_region	Exon 1 of 18	ENSP00000383365.1	Q9NNW7-1
	TXNRD2	ENST00000400519.6	TSL:1	c.103G>C	p.Gly35Arg	missense splice_region	Exon 1 of 17	ENSP00000383363.1	A0A182DWF3
	TXNRD2	ENST00000334363.14	TSL:1	c.103G>C	p.Ala35Pro	missense splice_region	Exon 1 of 12	ENSP00000334451.9	E7EWK1

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152134 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000189

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1330998 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 656338

African (AFR) AF: 0.00 AC: 0 AN: 26792

American (AMR) AF: 0.00 AC: 0 AN: 28772

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23156

East Asian (EAS) AF: 0.00 AC: 0 AN: 30132

South Asian (SAS) AF: 0.00 AC: 0 AN: 73862

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33100

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3904

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1056068

Other (OTH) AF: 0.00 AC: 0 AN: 55212

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152134 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74340

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 41450

American (AMR) AF: 0.00 AC: 0 AN: 15276

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4838

European-Finnish (FIN) AF: 0.000189 AC: 2 AN: 10604

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 314

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67990

Other (OTH) AF: 0.00 AC: 0 AN: 2092

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.00000000770867), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Primary dilated cardiomyopathy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.097
BayesDel_addAF	Benign	-0.064	T
BayesDel_noAF	Benign	-0.33
CADD	Pathogenic	29
DANN	Uncertain	0.99
DEOGEN2	Benign	0.080	T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.51
FATHMM_MKL	Benign	0.061	N
LIST_S2	Benign	0.32	T
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.32	T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	0.0	N
PhyloP100		0.79
PrimateAI	Uncertain	0.65	T
PROVEAN	Pathogenic	-4.4	D
REVEL	Benign	0.092
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0010	D
Polyphen		0.62	P
Vest4		0.58
MutPred		0.40		Loss of sheet (P = 0.0457)
MVP		0.65
MPC		0.47
ClinPred		0.14	T
GERP RS		1.3
PromoterAI		-0.0067	Neutral
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		3.4
Varity_R		0.18
Mutation Taster		=76/24	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.92		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.65		Position offset: -27
DS_DL_spliceai		0.92		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1941724119; hg19: chr22-19929224;