rs17572791

Positions:

• chr1-43339422-T-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_005373.3(MPL):​c.543T>C​(p.Gly181=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00142 in 1,614,174 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 Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0074 (8 hom., cov: 32)
  • Exomes 𝑓: 0.00080 (13 hom.)
• Consequence: MPL NM_005373.3 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -1.29

Genes affected

MPL (HGNC:7217): (MPL proto-oncogene, thrombopoietin receptor) In 1990 an oncogene, v-mpl, was identified from the murine myeloproliferative leukemia virus that was capable of immortalizing bone marrow hematopoietic cells from different lineages. In 1992 the human homologue, named, c-mpl, was cloned. Sequence data revealed that c-mpl encoded a protein that was homologous with members of the hematopoietic receptor superfamily. Presence of anti-sense oligodeoxynucleotides of c-mpl inhibited megakaryocyte colony formation. The ligand for c-mpl, thrombopoietin, was cloned in 1994. Thrombopoietin was shown to be the major regulator of megakaryocytopoiesis and platelet formation. The protein encoded by the c-mpl gene, CD110, is a 635 amino acid transmembrane domain, with two extracellular cytokine receptor domains and two intracellular cytokine receptor box motifs . TPO-R deficient mice were severely thrombocytopenic, emphasizing the important role of CD110 and thrombopoietin in megakaryocyte and platelet formation. Upon binding of thrombopoietin CD110 is dimerized and the JAK family of non-receptor tyrosine kinases, as well as the STAT family, the MAPK family, the adaptor protein Shc and the receptors themselves become tyrosine phosphorylated. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP6: Variant 1-43339422-T-C is Benign according to our data. Variant chr1-43339422-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 297399.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-43339422-T-C is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=-1.29 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00743 (1131/152280) while in subpopulation AFR AF= 0.0259 (1075/41546). AF 95% confidence interval is 0.0246. There are 8 homozygotes in gnomad4. There are 527 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 8 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MPL	NM_005373.3	c.543T>C	p.Gly181=	synonymous_variant	4/12	ENST00000372470.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MPL	ENST00000372470.9	c.543T>C	p.Gly181=	synonymous_variant	4/12	1	NM_005373.3	P1
MPL	ENST00000413998.7	c.522T>C	p.Gly174=	synonymous_variant	4/12	1
MPL	ENST00000638732.1	n.543T>C		non_coding_transcript_exon_variant	4/10	1

Frequencies

GnomAD3 genomes AF: 0.00743 AC: 1130 AN: 152162 Hom.: 8 Cov.: 32

Gnomad AFR AF: 0.0259

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00249

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00574

GnomAD3 exomes AF: 0.00202 AC: 507 AN: 251460 Hom.: 7 AF XY: 0.00133 AC XY: 181 AN XY: 135920

Gnomad AFR exome AF: 0.0271

Gnomad AMR exome AF: 0.00142

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000703

Gnomad OTH exome AF: 0.00114

GnomAD4 exome AF: 0.000798 AC: 1166 AN: 1461894 Hom.: 13 Cov.: 32 AF XY: 0.000659 AC XY: 479 AN XY: 727248

Gnomad4 AFR exome AF: 0.0283

Gnomad4 AMR exome AF: 0.00174

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000580

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000207

Gnomad4 OTH exome AF: 0.00179

GnomAD4 genome AF: 0.00743 AC: 1131 AN: 152280 Hom.: 8 Cov.: 32 AF XY: 0.00708 AC XY: 527 AN XY: 74462

Gnomad4 AFR AF: 0.0259

Gnomad4 AMR AF: 0.00248

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00568

Alfa AF: 0.00396 Hom.: 4

Bravo AF: 0.00862

Asia WGS AF: 0.00231 AC: 9 AN: 3478

EpiCase AF: 0.000109

EpiControl AF: 0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Congenital amegakaryocytic thrombocytopenia Benign:2

Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jun 14, 2016	- -

Thrombocythemia 1 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Essential thrombocythemia;C1327915:Congenital amegakaryocytic thrombocytopenia Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	1.2
DANN	Benign	0.48

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: rs17572791; hg19: chr1-43805093;