chr9-133436888-G-A

Variant names:

• chr9-133436888-G-A
• rs36220239
• NM_139027.6:c.1368G>A

Variant summary

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

The NM_139027.6(ADAMTS13):​c.1368G>A​(p.Gln456Gln) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000697 in 1,435,242 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.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: ADAMTS13 NM_139027.6 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.21
• Publications: 0 publications found

Genes affected

ADAMTS13 (HGNC:1366): (ADAM metallopeptidase with thrombospondin type 1 motif 13) This gene encodes a member of a family of proteins containing several distinct regions, including a metalloproteinase domain, a disintegrin-like domain, and a thrombospondin type 1 (TS) motif. The enzyme encoded by this gene specifically cleaves von Willebrand Factor (vWF). Defects in this gene are associated with thrombotic thrombocytopenic purpura. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

ADAMTS13 Gene-Disease associations (from GenCC):

• congenital thrombotic thrombocytopenic purpura

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

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=-0.82).
• BP7: Synonymous conserved (PhyloP=1.21 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ADAMTS13	NM_139027.6	c.1368G>A	p.Gln456Gln	synonymous_variant	Exon 12 of 29	ENST00000355699.7	NP_620596.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ADAMTS13	ENST00000355699.7	c.1368G>A	p.Gln456Gln	synonymous_variant	Exon 12 of 29	1	NM_139027.6	ENSP00000347927.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.97e-7 AC: 1 AN: 1435242 Hom.: 0 Cov.: 35 AF XY: 0.00000141 AC XY: 1 AN XY: 711346

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

African (AFR) AF: 0.00 AC: 0 AN: 33224

American (AMR) AF: 0.00 AC: 0 AN: 40684

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25536

East Asian (EAS) AF: 0.00 AC: 0 AN: 38788

South Asian (SAS) AF: 0.00 AC: 0 AN: 82356

European-Finnish (FIN) AF: 0.0000200 AC: 1 AN: 50008

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5726

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1099588

Other (OTH) AF: 0.00 AC: 0 AN: 59332

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	1.8
DANN	Benign	0.58
PhyloP100		1.2

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs36220239; hg19: chr9-136302008;