rs587779388
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Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_001253852.3(AP4B1):c.1160_1161del(p.Thr387ArgfsTer30) variant causes a frameshift change. The variant allele was found at a frequency of 0.000111 in 1,609,850 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: 𝑓 0.00014 ( 0 hom., cov: 32)
Exomes 𝑓: 0.00011 ( 0 hom. )
Consequence
AP4B1
NM_001253852.3 frameshift
NM_001253852.3 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 6.69
Genes affected
AP4B1 (HGNC:572): (adaptor related protein complex 4 subunit beta 1) This gene encodes a subunit of a heterotetrameric adapter-like complex 4 that is involved in targeting proteins from the trans-Golgi network to the endosomal-lysosomal system. Mutations in this gene are associated with cerebral palsy spastic quadriplegic type 5 (CPSQ5) disorder. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2011]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 1-113898754-CTG-C is Pathogenic according to our data. Variant chr1-113898754-CTG-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 156414.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-113898754-CTG-C is described in Lovd as [Pathogenic]. Variant chr1-113898754-CTG-C is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
AP4B1 | NM_001253852.3 | c.1160_1161del | p.Thr387ArgfsTer30 | frameshift_variant | 6/10 | ENST00000369569.6 | |
AP4B1-AS1 | NR_125965.1 | n.536+767_536+768del | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
AP4B1 | ENST00000369569.6 | c.1160_1161del | p.Thr387ArgfsTer30 | frameshift_variant | 6/10 | 1 | NM_001253852.3 | P1 | |
AP4B1-AS1 | ENST00000419536.1 | n.368+767_368+768del | intron_variant, non_coding_transcript_variant | 2 |
Frequencies
GnomAD3 genomes AF: 0.000138 AC: 21AN: 152144Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.000137 AC: 34AN: 247490Hom.: 0 AF XY: 0.000142 AC XY: 19AN XY: 134086
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GnomAD4 exome AF: 0.000108 AC: 157AN: 1457706Hom.: 0 AF XY: 0.000127 AC XY: 92AN XY: 725356
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GnomAD4 genome AF: 0.000138 AC: 21AN: 152144Hom.: 0 Cov.: 32 AF XY: 0.000175 AC XY: 13AN XY: 74346
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ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:16Benign:1
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Hereditary spastic paraplegia 47 Pathogenic:8
Pathogenic, criteria provided, single submitter | clinical testing | Centre for Mendelian Genomics, University Medical Centre Ljubljana | Sep 04, 2019 | This variant was classified as: Pathogenic. The following ACMG criteria were applied in classifying this variant: PVS1,PM2,PM3,PP5. This variant was detected in homozygous state. - |
Pathogenic, criteria provided, single submitter | clinical testing | MGZ Medical Genetics Center | May 03, 2022 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Paris Brain Institute, Inserm - ICM | - | - - |
Pathogenic, no assertion criteria provided | literature only | OMIM | Apr 30, 2014 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Apr 11, 2023 | - - |
Pathogenic, no assertion criteria provided | research | Institute of Human Genetics, University Medical Center Hamburg-Eppendorf | Jan 01, 2012 | In two siblings who presented with severe ID, absent speech, microcephaly, growth retardation, and progressive spastic tetraplegia we detected the novel homozygous 2 bp deletion c.1159_1160delCA in AP4B1; the mutation was present in the heterozygous state in both parents. The AP4B1-associated phenotype has previously been assigned to spastic paraplegia-47 (SPG47). - |
Pathogenic, criteria provided, single submitter | clinical testing | Victorian Clinical Genetics Services, Murdoch Childrens Research Institute | Feb 02, 2022 | Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with spastic paraplegia 47 (MIM#614066). (I) 0106 - This gene is associated with autosomal recessive disease. (I) 0201 - Variant is predicted to cause nonsense-mediated decay (NMD) and loss of protein (premature termination codon is located at least 54 nucleotides upstream of the final exon-exon junction). (SP) 0251 - This variant is heterozygous. (I) 0304 - Variant is present in gnomAD (v2) <0.01 for a recessive condition (37 heterozygotes, 0 homozygotes). (SP) 0701 - Many NMD predicted variants comparable to the one identified in this case have very strong previous evidence for pathogenicity (ClinVar). (SP) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. This variant has been reported in multiple individuals with spastic paraplegia 47 (ClinVar, PMID: 29193663). (SP) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jan 09, 2024 | This sequence change creates a premature translational stop signal (p.Thr387Argfs*30) in the AP4B1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in AP4B1 are known to be pathogenic (PMID: 22290197, 24700674, 24781758). This variant is present in population databases (rs587779388, gnomAD 0.07%). This premature translational stop signal has been observed in individual(s) with AP4B1-related conditions (PMID: 24781758). ClinVar contains an entry for this variant (Variation ID: 156414). For these reasons, this variant has been classified as Pathogenic. - |
not provided Pathogenic:5
Pathogenic, no assertion criteria provided | clinical testing | Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+ | - | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Genetic Services Laboratory, University of Chicago | Jan 28, 2021 | - - |
Pathogenic, no assertion criteria provided | clinical testing | Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center | - | - - |
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Nov 10, 2023 | Observed in homozygous state in several unrelated patients in published literature with hypotonia, spastic paraplegia, microcephaly, severe intellectual disability, and global developmental delay and not observed in homozygous state in controls (PMID: 32166732, 24781758); Reported with a second AP4B1 variant in an individual with SPG47 in the published literature (PMID: 29193663); Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 24781758, 21620353, 21440262, 22290197, 25552650, 25693842, 24700674, 19559397, 23167973, 20972249, 23472171, 31525725, 32166732, 31915823, 33728854, 32895917, 32964447, 33726816, 34544818, 34729478, 29193663) - |
Pathogenic, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Apr 01, 2024 | AP4B1: PVS1, PM3:Strong, PM2 - |
Spastic paraplegia Pathogenic:1
Likely pathogenic, no assertion criteria provided | literature only | Yale Center for Mendelian Genomics, Yale University | Oct 01, 2020 | - - |
Inborn genetic diseases Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Nov 30, 2016 | - - |
Abnormality of the nervous system Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Kariminejad - Najmabadi Pathology & Genetics Center | Jul 10, 2021 | - - |
Intellectual disability Benign:1
Likely benign, no assertion criteria provided | clinical testing | Centre de Biologie Pathologie Génétique, Centre Hospitalier Universitaire de Lille | Jan 01, 2019 | - - |
Computational scores
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at