3-184376395-A-C

Variant names:

• chr3-184376395-A-C
• rs956732
• NM_000460.4:c.-136T>G

Variant summary

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

The NM_001290003.1(THPO):​c.285T>G​(p.Ser95Ser) variant causes a synonymous 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. Synonymous variant affecting the same amino acid position (i.e. S95S) has been classified as Benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: THPO NM_001290003.1 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.565
• Publications: 15 publications found

Genes affected

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

  Inheritance: SD, AR Classification: DEFINITIVE, MODERATE Submitted by: ClinGen
• thrombocytopenia 9

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
• 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 -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.61).
• BP7: Synonymous conserved (PhyloP=0.565 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001290003.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	THPO	NM_000460.4	MANE Select	c.-136T>G		5_prime_UTR	Exon 2 of 6	NP_000451.1	P40225-1
	THPO	NM_001290003.1		c.285T>G	p.Ser95Ser	synonymous	Exon 3 of 7	NP_001276932.1	A0A3B3ITS0
	THPO	NM_001289998.1		c.-136T>G		5_prime_UTR	Exon 3 of 7	NP_001276927.1	P40225-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	THPO	ENST00000647395.1	MANE Select	c.-136T>G		5_prime_UTR	Exon 2 of 6	ENSP00000494504.1	P40225-1
	THPO	ENST00000445696.6	TSL:1	c.-136T>G		5_prime_UTR	Exon 2 of 6	ENSP00000410763.2	P40225-2
	THPO	ENST00000645603.2		c.285T>G	p.Ser95Ser	synonymous	Exon 4 of 8	ENSP00000494281.2	A0A3B3ITS0

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 41

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.61
CADD	Benign	12
DANN	Benign	0.65
PhyloP100		0.56
PromoterAI		0.42	Neutral

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: rs956732; hg19: chr3-184094183;