1-164799889-G-C

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM1PM2PM5PP2PP3_ModeratePP5_Moderate

The NM_002585.4(PBX1):​c.701G>C​(p.Arg234Pro) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 14/23 in silico tools predict a damaging outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R234W) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 32)

Consequence

PBX1
NM_002585.4 missense, splice_region

Scores

14
4
1
Splicing: ADA: 1.000
2

Clinical Significance

Likely pathogenic criteria provided, single submitter P:2

Conservation

PhyloP100: 9.46
Variant links:
Genes affected
PBX1 (HGNC:8632): (PBX homeobox 1) This gene encodes a nuclear protein that belongs to the PBX homeobox family of transcriptional factors. Studies in mice suggest that this gene may be involved in the regulation of osteogenesis and required for skeletal patterning and programming. A chromosomal translocation, t(1;19) involving this gene and TCF3/E2A gene, is associated with pre-B-cell acute lymphoblastic leukemia. The resulting fusion protein, in which the DNA binding domain of E2A is replaced by the DNA binding domain of this protein, transforms cells by constitutively activating transcription of genes regulated by the PBX protein family. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2017]

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PM1
In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 1 uncertain in NM_002585.4
PM2
Very rare variant in population databases, with high coverage;
PM5
Other missense variant is known to change same aminoacid residue: Variant chr1-164799889-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 559855.Status of the report is criteria_provided_single_submitter, 1 stars.
PP2
Missense variant in the PBX1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 15 curated pathogenic missense variants (we use a threshold of 10). The gene has 3 curated benign missense variants. Gene score misZ: 3.8266 (above the threshold of 3.09). Trascript score misZ: 4.2973 (above the threshold of 3.09). GenCC associations: The gene is linked to congenital anomalies of kidney and urinary tract syndrome with or without hearing loss, abnormal ears, or developmental delay.
PP3
MetaRNN computational evidence supports a deleterious effect, 0.9
PP5
Variant 1-164799889-G-C is Pathogenic according to our data. Variant chr1-164799889-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 523089.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect Exon rank MANE Protein UniProt
PBX1NM_002585.4 linkc.701G>C p.Arg234Pro missense_variant, splice_region_variant Exon 4 of 9 ENST00000420696.7 NP_002576.1 P40424-1A1MJ41A8K5V0

Ensembl

Gene Transcript HGVSc HGVSp Effect Exon rank TSL MANE Protein Appris UniProt
PBX1ENST00000420696.7 linkc.701G>C p.Arg234Pro missense_variant, splice_region_variant Exon 4 of 9 1 NM_002585.4 ENSP00000405890.2 P40424-1

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD4 exome
Cov.:
31
GnomAD4 genome
Cov.:
32

ClinVar

Significance: Likely pathogenic
Submissions summary: Pathogenic:2
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

PBX1-related intellectual disability and pleiotropic developmental defects Pathogenic:1
Feb 28, 2019
Illumina Laboratory Services, Illumina
Significance: Likely pathogenic
Review Status: criteria provided, single submitter
Collection Method: clinical testing

The PBX1 c.701G>C (p.Arg234Pro) variant is a missense variant that has been reported in one study, in which it is found in a heterozygous state, presumed de novo, in 24 month old female proband (Slavotinek et al. 2017). The proband’s phenotype included global developmental delay, hypotonia and a history of a patent PDA ligation and pulmonary artery hypertension. Polyhydramnios and decreased fetal movements had led to emergency C-section at 32 weeks gestation. The p.Arg234Pro variant is not found in the Genome Aggregation Database. The Arg234 is a highly conserved residue located within the homeobox domain of PBX1. An in vitro luciferase assay, using heterologous expression of a PBX1 p.Arg234Pro construct, demonstrated that this variant has reduced transcriptional activity compared to the wild type (Slavotinek et al. 2017). Based on the collective evidence and application of the ACMG criteria, the PBX1 p.Arg234Pro variant is classified as likely pathogenic for PBX1-related intellectual disability and pleiotropic developmental defects. -

Congenital anomalies of kidney and urinary tract syndrome with or without hearing loss, abnormal ears, or developmental delay Pathogenic:1
Apr 26, 2018
OMIM
Significance: Pathogenic
Review Status: no assertion criteria provided
Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
1.0
BayesDel_addAF
Pathogenic
0.50
D
BayesDel_noAF
Pathogenic
0.49
CADD
Pathogenic
34
DANN
Uncertain
1.0
DEOGEN2
Uncertain
0.68
D;.;.;D;.;T;T;.
Eigen
Pathogenic
0.94
Eigen_PC
Pathogenic
0.90
FATHMM_MKL
Pathogenic
0.97
D
LIST_S2
Pathogenic
0.99
D;D;D;D;D;D;D;D
M_CAP
Pathogenic
0.40
D
MetaRNN
Pathogenic
0.90
D;D;D;D;D;D;D;D
MetaSVM
Pathogenic
1.1
D
MutationAssessor
Pathogenic
2.9
M;M;M;.;.;.;.;.
PrimateAI
Pathogenic
0.93
D
PROVEAN
Pathogenic
-6.7
D;.;D;D;D;D;.;.
REVEL
Pathogenic
0.93
Sift
Uncertain
0.0020
D;.;D;D;D;D;.;.
Sift4G
Uncertain
0.033
D;D;D;T;D;D;T;D
Polyphen
1.0
D;.;.;.;.;.;.;.
Vest4
0.77
MutPred
0.63
Loss of stability (P = 0.0643);Loss of stability (P = 0.0643);Loss of stability (P = 0.0643);Loss of stability (P = 0.0643);.;.;.;.;
MVP
0.95
MPC
3.6
ClinPred
1.0
D
GERP RS
5.6
Varity_R
0.96
gMVP
1.0

Splicing

Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
1.0
dbscSNV1_RF
Pathogenic
1.0
SpliceAI score (max)
0.040
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

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs1553248112; hg19: chr1-164769126; API