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Intellectual disability - microarray and sequencing v5.299 PPFIBP1 Arina Puzriakova Tag Q2_23_promote_green was removed from gene: PPFIBP1.
Intellectual disability - microarray and sequencing v5.286 PPFIBP1 Arina Puzriakova reviewed gene: PPFIBP1: Rating: GREEN; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Intellectual disability - microarray and sequencing v5.286 PPFIBP1 Arina Puzriakova Source NHS GMS was added to PPFIBP1.
Source Expert Review Green was added to PPFIBP1.
Rating Changed from Amber List (moderate evidence) to Green List (high evidence)
Intellectual disability - microarray and sequencing v5.93 PPFIBP1 Achchuthan Shanmugasundram Classified gene: PPFIBP1 as Amber List (moderate evidence)
Intellectual disability - microarray and sequencing v5.93 PPFIBP1 Achchuthan Shanmugasundram Gene: ppfibp1 has been classified as Amber List (Moderate Evidence).
Intellectual disability - microarray and sequencing v5.93 PPFIBP1 Achchuthan Shanmugasundram Classified gene: PPFIBP1 as Amber List (moderate evidence)
Intellectual disability - microarray and sequencing v5.93 PPFIBP1 Achchuthan Shanmugasundram Gene: ppfibp1 has been classified as Amber List (Moderate Evidence).
Intellectual disability - microarray and sequencing v5.93 PPFIBP1 Achchuthan Shanmugasundram Classified gene: PPFIBP1 as Amber List (moderate evidence)
Intellectual disability - microarray and sequencing v5.93 PPFIBP1 Achchuthan Shanmugasundram Gene: ppfibp1 has been classified as Amber List (Moderate Evidence).
Intellectual disability - microarray and sequencing v5.92 PPFIBP1 Achchuthan Shanmugasundram Classified gene: PPFIBP1 as Amber List (moderate evidence)
Intellectual disability - microarray and sequencing v5.92 PPFIBP1 Achchuthan Shanmugasundram Gene: ppfibp1 has been classified as Amber List (Moderate Evidence).
Intellectual disability - microarray and sequencing v5.92 PPFIBP1 Achchuthan Shanmugasundram Classified gene: PPFIBP1 as Amber List (moderate evidence)
Intellectual disability - microarray and sequencing v5.92 PPFIBP1 Achchuthan Shanmugasundram Gene: ppfibp1 has been classified as Amber List (Moderate Evidence).
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.92 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.92 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.92 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Tag Q2_23_promote_green tag was added to gene: PPFIBP1.
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024 to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.91 PPFIBP1 Achchuthan Shanmugasundram Phenotypes for gene: PPFIBP1 were changed from Global developmental delay; Intellectual disability; Microcephaly; Seizures; Abnormality of brain morphology; Abnormality of the cerebral white matter; Cerebral calcification; Abnormal cortical gyration; Hypertonia; Spastic tetraplegia; Generalized hypotonia; Small for gestational age; Growth delay; Failure to thrive; Feeding difficulties; abnormal heart morphology; Hearing abnormality; Cryptorchidism; Abnormality of vision to Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.90 PPFIBP1 Achchuthan Shanmugasundram edited their review of gene: PPFIBP1: Changed phenotypes to: Neurodevelopmental disorder with seizures, microcephaly, and brain abnormalities, OMIM:620024
Intellectual disability - microarray and sequencing v5.90 PPFIBP1 Achchuthan Shanmugasundram reviewed gene: PPFIBP1: Rating: GREEN; Mode of pathogenicity: None; Publications: 35830857; Phenotypes: intellectual disability, MONDO:0001071; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Intellectual disability - microarray and sequencing v3.1628 PPFIBP1 Konstantinos Varvagiannis gene: PPFIBP1 was added
gene: PPFIBP1 was added to Intellectual disability. Sources: Literature
Mode of inheritance for gene: PPFIBP1 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: PPFIBP1 were set to 35830857; 30214071
Phenotypes for gene: PPFIBP1 were set to Global developmental delay; Intellectual disability; Microcephaly; Seizures; Abnormality of brain morphology; Abnormality of the cerebral white matter; Cerebral calcification; Abnormal cortical gyration; Hypertonia; Spastic tetraplegia; Generalized hypotonia; Small for gestational age; Growth delay; Failure to thrive; Feeding difficulties; abnormal heart morphology; Hearing abnormality; Cryptorchidism; Abnormality of vision
Penetrance for gene: PPFIBP1 were set to Complete
Review for gene: PPFIBP1 was set to GREEN
Added comment: Consider inclusion with green rating in the ID, epilepsy as well as other likely relevant gene panels (microcephaly, white matter disorders, corpus callosum abnormalities, intracerebral calficication disorders, malformations of cortical development, hereditary spastic paraplegia, growth failure in early childhood, etc) based on the summary below.

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Rosenhahn et al (2022 - PMID: 35830857) describe the phenotype of 16 individuals - belonging to 12 unrelated families - with biallelic PPFIBP1 pathogenic variants. Most (14/16) were born to consanguineous parents. One of these families was previously reported by Shaheen et al (2019 - PMID: 30214071) who first identified PPFIBP1 as a candidate gene for congenital microcephaly. In the current study, Rosenhahn also identified a fetus homozygous for a missense variant and similar features.

All individuals presented global DD/ID (16/16 - in 15 cases profound/severe) and epilepsy (16/16 - onset 1d-4y / median 2m - focal seizures in 11/16, epileptic spams in 7/16, generalized onset in 7/16, myoclonic in 6/16 - drug-resistant : 13/16). Almost all (15/16) had microcephaly, commonly congenital (9/16) and progressive (11/16). Other neurological findings included hypertonia (10/16), spastic tetraplegia (6/16), hypotonia (5/16), dystonic movements (3/16) or nystagmus (4/16). Brain abnormalities were identified in all investigated with MRI and included leukoencephalopathy (11/14) mostly periventricular, abnormal cortex morphology (7/14 - polymicrogyria 1, increased cortical thickness 4, pachygyria 3), cortical atrophy, corpus callosum hypoplasia (7/14). Intracranial calcifications were identified in all (9/9) investigated with CT scan. Abnormal growth was reported for several (SGA in 9/16, FTT 8/16, short stature 7/16) often associated with feeding difficulties (7/16). Other features incl. abnormal hearing (4/16), congenital heart defects (7/16), ophthalmologic findings (8/16), undescended testes (3/10). There were no overlapping facial features.

The fetus displayed similar features incl. SGA, microcephaly, intracranial calcifications.

Investigations incl. exome/genome sequencing (singleton or trio) with Sanger for confirmation/segregation of variants where necessary. Variable previous investigations incl. metabolic screening, TORCH screening, chromosomal studies (CMA) are mentioned in the supplement and were non-diagnostic. Additional candidate variants were identified in few cases although cases with plausible dual diagnoses (e.g. ind14) were not included in the overall phenotypic description.

9 pLoF variants (nonsense, frameshift, 1 splicing) predicted to lead to NMD were identified. There were no functional studies performed.
The missense variant c.2177G>T / p.Gly726Val (NM_003622.4) was predicted deleterious by in silico tools while the AA change causing severe steric problems upon modelling.

PPFIBP1 encodes PPFIA-binding protein 1 also known as liprin-β1. As the authors discuss: The liprin family of proteins comprises liprins α1 to 4 and liprin β1 and β2 in mammals. Liprin β1 is known to homodimerize and heterodimerize with α-liprins. In fibroblast cultures liprins β1 and α1 colocalize to cell membrane and periphery of focal adhesions. Members of the liprin-α fam. are scaffold proteins playing a role in synapse formation/signaling and axonal transport.

A ko model of the PPFIBP1 ortholog in C.elegans displayed abnormal locomotion behavior. In Drosophila, null-allele mutants resulted in altered axon outgrowth and synapse formation of R7 photoreceptors and reduced neuromuscular junction size (Refs provided in article).

Using a PPFIBP1/hlb-1 ko C.elegans model the authors demonstrated defects in spontaneous and light-induced behavior. Sensitivity of the worms to an acetylcholinesterase inhibitor (aldicarb) was suggestive of a presynaptic defect.

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There is currently no PPFIBP1 - associated phenotype in OMIM / G2P.
SysNDD lists PPFIBP1 among the ID genes (limited evidence based on the 3 sibs reported by Shaheen et al, 2019 - PMID: 30214071).
In PanelApp Australia the gene is listed with green rating for ID, epilepsy, microcephaly based on the medRxiv pre-print.
Sources: Literature
Intellectual disability - microarray and sequencing v3.310 FIBP Arina Puzriakova Classified gene: FIBP as Amber List (moderate evidence)
Intellectual disability - microarray and sequencing v3.310 FIBP Arina Puzriakova Added comment: Comment on list classification: Rating upgraded from Red to Amber based on review by Zornitza Stark.
Intellectual disability - microarray and sequencing v3.310 FIBP Arina Puzriakova Gene: fibp has been classified as Amber List (Moderate Evidence).
Intellectual disability - microarray and sequencing v3.309 FIBP Arina Puzriakova Phenotypes for gene: FIBP were changed from Thauvin-Robinet-Faivre syndrome to Thauvin-Robinet-Faivre syndrome, 617107
Intellectual disability - microarray and sequencing v3.308 FIBP Arina Puzriakova Added comment: Comment on publications: Two publications (PMID: 26660953; 27183861) describing four individuals from two unrelated families.
Intellectual disability - microarray and sequencing v3.308 FIBP Arina Puzriakova Publications for gene: FIBP were set to 26660953
Intellectual disability - microarray and sequencing v2.468 FIBP Louise Daugherty Source Victorian Clinical Genetics Services was added to FIBP.
Intellectual disability - microarray and sequencing FIBP Zornitza Stark Added gene to panel