20-23049049-G-T

Variant names:

• chr20-23049049-G-T
• rs1060499909
• NM_000361.3:c.456C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The ENST00000377103.3(THBD):​c.456C>A​(p.Ile152Ile) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000141 in 1,418,252 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. I152I) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: THBD ENST00000377103.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.134
• Publications: 0 publications found

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]

THBD Gene-Disease associations (from GenCC):

• atypical hemolytic-uremic syndrome with thrombomodulin anomaly

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• thrombomodulin-related bleeding disorder

  Inheritance: AR, AD, Unknown Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: ClinGen, Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)

ENSG00000296483 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.65).
• BP7: Synonymous conserved (PhyloP=0.134 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000377103.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	THBD	NM_000361.3	MANE Select	c.456C>A	p.Ile152Ile	synonymous	Exon 1 of 1	NP_000352.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	THBD	ENST00000377103.3	TSL:6 MANE Select	c.456C>A	p.Ile152Ile	synonymous	Exon 1 of 1	ENSP00000366307.2
	ENSG00000296483	ENST00000739851.1		n.795+1770C>A		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00 AC: 0 AN: 187472 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000141 AC: 2 AN: 1418252 Hom.: 0 Cov.: 32 AF XY: 0.00000143 AC XY: 1 AN XY: 700834

African (AFR) AF: 0.00 AC: 0 AN: 32658

American (AMR) AF: 0.00 AC: 0 AN: 38760

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25322

East Asian (EAS) AF: 0.00 AC: 0 AN: 37598

South Asian (SAS) AF: 0.0000123 AC: 1 AN: 81482

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47538

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5724

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1090518

Other (OTH) AF: 0.0000170 AC: 1 AN: 58652

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.65
CADD	Benign	5.9
DANN	Benign	0.68
PhyloP100		0.13

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: rs1060499909; hg19: chr20-23029686;