22-19723570-A-T
Variant summary
Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1PS1_ModeratePM2PP5_Moderate
The NM_000407.5(GP1BB):c.1A>T(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000208 in 1,444,864 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).
Frequency
Genomes: not found (cov: 33)
Exomes 𝑓: 0.0000021 ( 0 hom. )
Consequence
GP1BB
NM_000407.5 start_lost
NM_000407.5 start_lost
Scores
7
2
7
Clinical Significance
Conservation
PhyloP100: 1.75
Genes affected
GP1BB (HGNC:4440): (glycoprotein Ib platelet subunit beta) Platelet glycoprotein Ib (GPIb) is a heterodimeric transmembrane protein consisting of a disulfide-linked 140 kD alpha chain and 22 kD beta chain. It is part of the GPIb-V-IX system that constitutes the receptor for von Willebrand factor (VWF), and mediates platelet adhesion in the arterial circulation. GPIb alpha chain provides the VWF binding site, and GPIb beta contributes to surface expression of the receptor and participates in transmembrane signaling through phosphorylation of its intracellular domain. Mutations in the GPIb beta subunit have been associated with Bernard-Soulier syndrome, velocardiofacial syndrome and giant platelet disorder. The 206 amino acid precursor of GPIb beta is synthesized from a 1.0 kb mRNA expressed in plateletes and megakaryocytes. A 411 amino acid protein arising from a longer, unspliced transcript in endothelial cells has been described; however, the authenticity of this product has been questioned. Yet another less abundant GPIb beta mRNA species of 3.5 kb, expressed in nonhematopoietic tissues such as endothelium, brain and heart, was shown to result from inefficient usage of a non-consensus polyA signal in the neighboring upstream gene (SEPT5, septin 5). In the absence of polyadenylation from its own imperfect site, the SEPT5 gene produces read-through transcripts that use the consensus polyA signal of this gene. [provided by RefSeq, Dec 2010]
SEPTIN5 (HGNC:9164): (septin 5) This gene is a member of the septin gene family of nucleotide binding proteins, originally described in yeast as cell division cycle regulatory proteins. Septins are highly conserved in yeast, Drosophila, and mouse and appear to regulate cytoskeletal organization. Disruption of septin function disturbs cytokinesis and results in large multinucleate or polyploid cells. This gene is mapped to 22q11, the region frequently deleted in DiGeorge and velocardiofacial syndromes. A translocation involving the MLL gene and this gene has also been reported in patients with acute myeloid leukemia. Alternative splicing results in multiple transcript variants. The presence of a non-consensus polyA signal (AACAAT) in this gene also results in read-through transcription into the downstream neighboring gene (GP1BB; platelet glycoprotein Ib), whereby larger, non-coding transcripts are produced. [provided by RefSeq, Dec 2010]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 14 ACMG points.
PVS1
?
Start lost variant, no new inframe start found.
PS1
?
Another start lost variant in NM_000407.5 (GP1BB) was described as [Likely_pathogenic] in ClinVar as 812741
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 22-19723570-A-T is Pathogenic according to our data. Variant chr22-19723570-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 1691253.Status of the report is criteria_provided_single_submitter, 1 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
GP1BB | NM_000407.5 | c.1A>T | p.Met1? | start_lost | 1/2 | ENST00000366425.4 | |
SEPT5-GP1BB | NR_037611.1 | n.3741A>T | non_coding_transcript_exon_variant | 11/12 | |||
SEPT5-GP1BB | NR_037612.1 | n.2245A>T | non_coding_transcript_exon_variant | 11/12 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
GP1BB | ENST00000366425.4 | c.1A>T | p.Met1? | start_lost | 1/2 | 1 | NM_000407.5 | P1 | |
SEPTIN5 | ENST00000470814.1 | n.1973A>T | non_coding_transcript_exon_variant | 5/6 | 5 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD3 genomes
?
Cov.:
33
GnomAD4 exome AF: 0.00000208 AC: 3AN: 1444864Hom.: 0 Cov.: 31 AF XY: 0.00000418 AC XY: 3AN XY: 718488
GnomAD4 exome
AF:
AC:
3
AN:
1444864
Hom.:
Cov.:
31
AF XY:
AC XY:
3
AN XY:
718488
Gnomad4 AFR exome
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GnomAD4 genome ? Cov.: 33
GnomAD4 genome
?
Cov.:
33
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:2
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Mild macrothrombocytopenia Pathogenic:1
Likely pathogenic, no assertion criteria provided | research | ISTH-SSC Genomics in Thrombosis and Hemostasis, KU Leuven, Center for Molecular and Vascular Biology | - | - - |
Bernard Soulier syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | ISTH-SSC Genomics in Thrombosis and Hemostasis, KU Leuven, Center for Molecular and Vascular Biology | - | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Uncertain
Dann
Benign
DEOGEN2
Benign
T
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D
MetaSVM
Benign
T
MutationTaster
Benign
D
PROVEAN
Benign
N
REVEL
Uncertain
Sift
Pathogenic
D
Sift4G
Pathogenic
D
Polyphen
B
Vest4
MutPred
Loss of catalytic residue at M1 (P = 0.1307);
MVP
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at