3-184378790-A-T

Variant names:

• chr3-184378790-A-T
• rs885838
• ENST00000691896.3:n.736A>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000691896.3(ENSG00000289500):​n.736A>T variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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: 32)
• Consequence: ENSG00000289500 ENST00000691896.3 non_coding_transcript_exon
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.37
• Publications: 12 publications found

Genes affected

ENSG00000289500 (HGNC:):

THPO (HGNC:11795): (thrombopoietin) Megakaryocytopoiesis is the cellular development process that leads to platelet production. The main functional protein encoded by this gene is a humoral growth factor that is necessary for megakaryocyte proliferation and maturation, as well as for thrombopoiesis. This protein is the ligand for MLP/C_MPL, the product of myeloproliferative leukemia virus oncogene. Mutations in this gene are the cause of thrombocythemia 1. Alternative promoter usage and differential splicing result in multiple transcript variants differing in the 5' UTR and/or coding region. Multiple AUG codons upstream of the main open reading frame (ORF) have been identified, and these upstream AUGs inhibit translation of the main ORF at different extent. [provided by RefSeq, Feb 2014]

THPO Gene-Disease associations (from GenCC):

• thrombocythemia 1

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: ClinGen, Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• congenital amegakaryocytic thrombocytopenia

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• familial thrombocytosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary isolated aplastic anemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary thrombocytosis with transverse limb defect

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• congenital amegakaryocytic thrombocytopenia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
THPO	NM_001290003.1	c.-28-413T>A		intron_variant	Intron 1 of 6		NP_001276932.1
THPO	NM_001289998.1	c.-448-413T>A		intron_variant	Intron 1 of 6		NP_001276927.1
THPO	NM_001290028.1	c.-146+801T>A		intron_variant	Intron 1 of 5		NP_001276957.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ENSG00000289500	ENST00000691896.3	n.736A>T		non_coding_transcript_exon_variant	Exon 1 of 1
THPO	ENST00000645603.2	c.-28-413T>A		intron_variant	Intron 2 of 7			ENSP00000494281.2
THPO	ENST00000649095.1	c.-28-413T>A		intron_variant	Intron 1 of 6			ENSP00000497904.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.14
DANN	Benign	0.52
PhyloP100		-2.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs885838; hg19: chr3-184096578;