22-19918225-G-A

Position:

• chr22-19918225-G-A

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP4_Strong BP6_Very_Strong BS2

The NM_006440.5(TXNRD2):​c.375-8C>T variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000441 in 1,613,994 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00043 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00044 (2 hom.)
• Consequence: TXNRD2 NM_006440.5 splice_region, splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.00002320
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -1.04

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]

ACMG classification

Verdict is Benign. Variant got -16 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BP6: Variant 22-19918225-G-A is Benign according to our data. Variant chr22-19918225-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 507782.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr22-19918225-G-A is described in Lovd as [Likely_benign].
• BS2: High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TXNRD2	NM_006440.5	c.375-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000400521.7	NP_006431.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TXNRD2	ENST00000400521.7	c.375-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_006440.5	ENSP00000383365	P4

Frequencies

GnomAD3 genomes AF: 0.000427 AC: 65 AN: 152248 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000785

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000617

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.000477 AC: 119 AN: 249462 Hom.: 0 AF XY: 0.000510 AC XY: 69 AN XY: 135360

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000551

Gnomad ASJ exome AF: 0.0000993

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000686

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000636

Gnomad OTH exome AF: 0.000991

GnomAD4 exome AF: 0.000442 AC: 646 AN: 1461628 Hom.: 2 Cov.: 31 AF XY: 0.000484 AC XY: 352 AN XY: 727134

Gnomad4 AFR exome AF: 0.000119

Gnomad4 AMR exome AF: 0.000470

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000730

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.000421

Gnomad4 OTH exome AF: 0.000613

GnomAD4 genome AF: 0.000427 AC: 65 AN: 152366 Hom.: 0 Cov.: 32 AF XY: 0.000376 AC XY: 28 AN XY: 74510

Gnomad4 AFR AF: 0.000120

Gnomad4 AMR AF: 0.000784

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000386

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000617

Gnomad4 OTH AF: 0.000946

Alfa AF: 0.000893 Hom.: 0

Bravo AF: 0.000431

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:4

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Likely benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 06, 2020	This variant is associated with the following publications: (PMID: 26656175) -

Primary dilated cardiomyopathy Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 22, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	0.15
DANN	Benign	0.49

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000023
dbscSNV1_RF	Benign	0.0020
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: rs180876844; hg19: chr22-19905748;