20-23045634-G-A

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_000361.3(THBD):c.*2143C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0123 in 152,264 control chromosomes in the GnomAD database, including 21 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.012 (21 hom., cov: 33)
  • Failed GnomAD Quality Control
• Consequence: THBD NM_000361.3 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.398

Genes affected

THBD (HGNC:11784): (thrombomodulin) The protein encoded by this intronless gene is an endothelial-specific type I membrane receptor that binds thrombin. This binding results in the activation of protein C, which degrades clotting factors Va and VIIIa and reduces the amount of thrombin generated. Mutations in this gene are a cause of thromboembolic disease, also known as inherited thrombophilia. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.69).
• BP6: Variant 20-23045634-G-A is Benign according to our data. Variant chr20-23045634-G-A is described in ClinVar as [Benign]. Clinvar id is 337849.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr20-23045634-G-A is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.0123 (1868/152264) while in subpopulation SAS AF= 0.0193 (93/4826). AF 95% confidence interval is 0.0171. There are 21 homozygotes in gnomad4. There are 935 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High AC in GnomAd at 1865 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
THBD	NM_000361.3	c.*2143C>T		3_prime_UTR_variant	1/1	ENST00000377103.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
THBD	ENST00000377103.3	c.*2143C>T		3_prime_UTR_variant	1/1		NM_000361.3	P1

Frequencies

GnomAD3 genomes AF: 0.0123 AC: 1865 AN: 152146 Hom.: 21 Cov.: 33

Gnomad AFR AF: 0.00251

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0107

Gnomad ASJ AF: 0.00634

Gnomad EAS AF: 0.000578

Gnomad SAS AF: 0.0188

Gnomad FIN AF: 0.0231

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0179

Gnomad OTH AF: 0.00813

GnomAD4 exome Data not reliable, filtered out with message: AC0 AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

GnomAD4 genome AF: 0.0123 AC: 1868 AN: 152264 Hom.: 21 Cov.: 33 AF XY: 0.0126 AC XY: 935 AN XY: 74450

Gnomad4 AFR AF: 0.00250

Gnomad4 AMR AF: 0.0107

Gnomad4 ASJ AF: 0.00634

Gnomad4 EAS AF: 0.000579

Gnomad4 SAS AF: 0.0193

Gnomad4 FIN AF: 0.0231

Gnomad4 NFE AF: 0.0179

Gnomad4 OTH AF: 0.00805

Alfa AF: 0.0155 Hom.: 22

Bravo AF: 0.0106

Asia WGS AF: 0.00577 AC: 20 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Atypical hemolytic-uremic syndrome with thrombomodulin anomaly Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
Cadd	Benign	11
Dann	Benign	0.84

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: rs3176126; hg19: chr20-23026271;