chr22-19941683-G-GC

Variant names:

• chr22-19941683-G-GC
• rs756452923
• NM_006440.5:c.103+17dupG

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP6_Very_Strong

The NM_006440.5(TXNRD2):​c.103+17dupG variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000425 in 1,467,128 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00032 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00044 (1 hom.)
• Consequence: TXNRD2 NM_006440.5 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.115
• Publications: 1 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: Benign. The variant received -8 ACMG points.

• BP6: Variant 22-19941683-G-GC is Benign according to our data. Variant chr22-19941683-G-GC is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 422808.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

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.103+17dupG		intron	N/A	NP_006431.2
	TXNRD2	NM_001352300.2		c.103+17dupG		intron	N/A	NP_001339229.1
	TXNRD2	NM_001282512.3		c.103+17dupG		intron	N/A	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.103+17_103+18insG		intron	N/A	ENSP00000383365.1	Q9NNW7-1
	TXNRD2	ENST00000400519.6	TSL:1	c.103+17_103+18insG		intron	N/A	ENSP00000383363.1	A0A182DWF3
	TXNRD2	ENST00000334363.14	TSL:1	c.103+17_103+18insG		intron	N/A	ENSP00000334451.9	E7EWK1

Frequencies

GnomAD3 genomes AF: 0.000315 AC: 48 AN: 152158 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000724

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000588

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.000205 AC: 16 AN: 77990 AF XY: 0.000156

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000351

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000359

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000437 AC: 575 AN: 1314970 Hom.: 1 Cov.: 31 AF XY: 0.000430 AC XY: 279 AN XY: 648546

African (AFR) AF: 0.000152 AC: 4 AN: 26242

American (AMR) AF: 0.000358 AC: 9 AN: 25118

Ashkenazi Jewish (ASJ) AF: 0.0000447 AC: 1 AN: 22354

East Asian (EAS) AF: 0.00 AC: 0 AN: 29378

South Asian (SAS) AF: 0.0000140 AC: 1 AN: 71618

European-Finnish (FIN) AF: 0.0000305 AC: 1 AN: 32780

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3854

European-Non Finnish (NFE) AF: 0.000519 AC: 544 AN: 1049164

Other (OTH) AF: 0.000275 AC: 15 AN: 54462

GnomAD4 genome AF: 0.000315 AC: 48 AN: 152158 Hom.: 0 Cov.: 33 AF XY: 0.000188 AC XY: 14 AN XY: 74346

African (AFR) AF: 0.0000724 AC: 3 AN: 41452

American (AMR) AF: 0.000262 AC: 4 AN: 15272

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10614

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

European-Non Finnish (NFE) AF: 0.000588 AC: 40 AN: 68008

Other (OTH) AF: 0.000478 AC: 1 AN: 2092

Alfa AF: 0.000972 Hom.: 0

Bravo AF: 0.000208

ClinVar

ClinVar submissions

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	not specified (1)
-	-	1	Primary dilated cardiomyopathy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.12
Mutation Taster		=100/0	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: rs756452923; hg19: chr22-19929206;