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Orofaciodigital Syndrome Type I

Disease Pathophysiology Research Report

2026-02-10
Falcon MONDO:0010702 Model: Edison Scientific Literature 27 citations

Disease Pathophysiology Research Report

Target Disease - Disease Name: Orofaciodigital syndrome type I (OFD1 syndrome) - MONDO ID: - Category: Mendelian (X‑linked dominant ciliopathy)

Pathophysiology overview OFD1 syndrome is a primary ciliopathy caused by pathogenic variants in OFD1, a centriolar and centriolar‑satellite protein essential for biogenesis of the primary cilium and for the integrity of distal appendages at the mother centriole. OFD1 localizes to the distal end of centrioles/basal bodies and to pericentriolar satellites, where its precise abundance and turnover control the initiation of ciliogenesis, distal appendage assembly, and downstream cilia‑dependent signaling in development. Failure of these processes produces a characteristic spectrum of craniofacial/oral, digital, brain, and renal phenotypes. Mechanistically, OFD1 is regulated by selective autophagy and by the ubiquitin–proteasome system (UPS), and it interfaces with actin nucleation (Arp2/3) to couple centrosomal actin dynamics to ciliogenesis. Disruption of OFD1 leads to defects in distal appendages (e.g., altered CEP164 homeostasis), impaired removal of CP110 from the mother centriole, and abnormal Hedgehog/Wnt signaling, which together explain key malformations and kidney disease in OFD1 patients (iaconis2020thehopscomplex pages 10-10, morleo2023crosstalkbetweencilia pages 9-10, senatore2021thetbc1d31praja2complex pages 1-2, magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5, cao2023anactinfilament pages 3-4, papuc2023autisticbehavioras pages 5-7).

1) Core pathophysiology: mechanisms, dysregulated pathways, affected processes - Centriole/satellite roles and ciliogenesis: OFD1 is a centrosome/basal‑body and centriolar‑satellite protein “required for primary cilia formation” and for axoneme/ distal assembly; its removal from the satellite pool is a gatekeeping step to commence ciliogenesis (Autophagy review, Morleo et al., 2023, URL: https://doi.org/10.1080/15548627.2022.2067383; Human Molecular Genetics, Iaconis et al., 2020, URL: https://doi.org/10.1093/hmg/ddaa029) (morleo2023crosstalkbetweencilia pages 9-10, iaconis2020thehopscomplex pages 10-10). - Autophagy–cilia axis: Selective autophagy of satellite OFD1 initiates ciliogenesis (“removal of OFD1 from centriolar satellites through the autophagy machinery is required to initiate ciliogenesis”). OFD1 also participates in autophagosome biogenesis, indicating bidirectional crosstalk (EMBO J., 2021, URL: https://doi.org/10.15252/embj.2020106503; Autophagy, 2023, URL above) (senatore2021thetbc1d31praja2complex pages 1-2, morleo2023crosstalkbetweencilia pages 9-10). - UPS control via PKA–Praja2: GPCR–cAMP–PKA phosphorylates OFD1 at Ser735 to promote Praja2 (E3)-mediated ubiquitylation and proteasomal degradation, a pathway essential for ciliogenesis and cilium morphology/dynamics in vivo (Medaka) (EMBO J., 2021, URL: https://doi.org/10.15252/embj.2020106503) (senatore2021thetbc1d31praja2complex pages 1-2). - Distal appendage homeostasis and actomyosin: Myosin VI binds OFD1 and “regulates the localisation of OFD1 at the centrioles and, as a consequence, the recruitment of the distal appendage protein CEP164.” Loss of myosin VI causes accumulation of OFD1 along centriole walls, increases CEP164 at centrioles, and “triggers a severe defect in ciliogenesis,” consistent with a role in OFD1 turnover possibly via short‑range transport on centrosomal actin (EMBO reports, 2022, URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 3-5, magistrati2022myosinviregulates pages 9-10). - Endolysosomal/autophagy machinery: VPS39 (HOPS) controls ciliogenesis through autophagy in renal cells and in vivo, linking lysosomal tethering machinery to the distribution of OFD1 at centriolar satellites and cilium assembly (Human Molecular Genetics, 2020, URL: https://doi.org/10.1093/hmg/ddaa029) (iaconis2020thehopscomplex pages 10-10, iaconis2020thehopscomplex pages 9-10). - Actin/Arp2/3 coupling: OFD1 directly binds the seven‑subunit Arp2/3 complex (“OFD1‑Flag pulled down the purified 7‑subunit Arp2/3 complex”) and “functions as a class II nucleation promoting factor to promote centrosomal actin branching.” OFD1 loss reduces centrosomal F‑actin, revealing a cytoskeletal mechanism that impacts ciliogenesis and cell‑cycle states (Nature Communications, 2023, URL: https://doi.org/10.1038/s41467-023-37340-z) (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4). - Signaling consequences: OFD1 deficiency perturbs cilia‑dependent Hedgehog (Shh) and Wnt signaling in development, underpinning neurodevelopmental and craniofacial patterning phenotypes (Genes, 2023, URL: https://doi.org/10.3390/genes14020327; additional summaries) (ekumi2020biochemicalandcellular pages 24-26, papuc2023autisticbehavioras pages 5-7).

2) Key molecular players - Genes/proteins (HGNC gene symbols): OFD1; distal appendage components CEP164, CEP83, SCLT1, FBF1; transition‑onset kinases TTBK2 and MARK4; CP110; centriolar satellite scaffold PCM1; motor MYO6 (myosin VI); HOPS subunit VPS39; PKA (PRKACA/PRKACB), E3 ligase PRAJA2; Arp2/3 subunits (ACTR2/ARP2, ACTR3/ARP3, ARPCs) (iaconis2020thehopscomplex pages 10-10, magistrati2022myosinviregulates pages 3-5, ekumi2020biochemicalandcellular pages 24-26, senatore2021thetbc1d31praja2complex pages 1-2, cao2023anactinfilament pages 1-2). - Chemical entities (CHEBI/biochemical): cAMP (PKA activation); autophagy modulators (general ATG/LC3 pathway); actin monomers/polymers (cytoskeletal branching). Where tested, Arp2/3 inhibitors (e.g., CK‑666) were used experimentally to probe pathways (Nature Communications, 2023) (cao2023anactinfilament pages 1-2). - Cell types (CL terms, narrative): renal tubular epithelial cells; neural progenitors/neurons; craniofacial mesenchyme/epithelia; multiciliated and primary ciliated epithelia (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7). - Anatomical locations (UBERON terms, narrative): basal body/centrioles (distal end), centriolar satellites (pericentriolar cytoplasm), transition zone; affected organs: kidney, brain, craniofacial/oral tissues, digits (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7).

3) Biological processes (GO-aligned, narrative) - Cilium assembly and organization; basal body docking; distal appendage assembly and maintenance (CEP164/CEP83/SCLT1/FBF1); CP110 removal and axoneme initiation (TTBK2/MARK4 recruitment via CEP164); centriolar satellite organization and proteostasis; selective macroautophagy; ubiquitin‑dependent protein catabolic process; GPCR–cAMP–PKA signaling; actin filament branching (Arp2/3), centrosomal actin dynamics; Hedgehog and Wnt signal transduction (ekumi2020biochemicalandcellular pages 24-26, morleo2023crosstalkbetweencilia pages 9-10, senatore2021thetbc1d31praja2complex pages 1-2, cao2023anactinfilament pages 1-2, magistrati2022myosinviregulates pages 3-5).

4) Cellular components (GO-aligned, narrative) - Centriole/basal body distal end and distal appendages (CEP164‑positive); centriolar satellites (PCM1‑positive); transition zone; primary cilium axoneme; pericentriolar material; endolysosomal compartments and autophagosomes; actin cytoskeleton at the centrosome (magistrati2022myosinviregulates pages 3-5, iaconis2020thehopscomplex pages 10-10, cao2023anactinfilament pages 1-2).

5) Disease progression: sequence of events - Initiation: Pathogenic OFD1 variants impair OFD1 dosage/localization at centrioles and satellites. Dysregulated clearance by autophagy and/or heightened degradation via UPS (PKA/Praja2) disturb the timing and level of OFD1 needed for ciliogenesis (morleo2023crosstalkbetweencilia pages 9-10, senatore2021thetbc1d31praja2complex pages 1-2). - Ciliogenesis block: Excess satellite OFD1 or mislocalized centriolar OFD1 impairs distal appendage homeostasis, CEP164 recruitment balance, and prevents CP110 removal, arresting axoneme elongation (EMBO reports, 2022; Ekumi synopsis) (magistrati2022myosinviregulates pages 3-5, ekumi2020biochemicalandcellular pages 24-26). - Signaling derangement: Absent/defective primary cilia lead to reduced or misregulated Shh/Wnt pathways in development, affecting brain patterning and craniofacial morphogenesis; renal tubular mechanosensation and signaling are perturbed, predisposing to cystogenesis (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7, ekumi2020biochemicalandcellular pages 24-26). - Tissue outcomes: Craniofacial/oral anomalies, digital malformations, neurodevelopmental defects (including periventricular nodular heterotopia and reported autistic behavior), and cystic kidney disease with risk of CKD progression (Genes, 2023; HMG, 2020) (papuc2023autisticbehavioras pages 5-7, iaconis2020thehopscomplex pages 10-10).

6) Phenotypic manifestations and mechanistic links - Craniofacial/oral: Oral malformations (lobulated tongue, clefting), facial dysmorphism; linked to disrupted Shh/Wnt and ciliary morphogen signaling (Genes, 2023, URL: https://doi.org/10.3390/genes14020327) (papuc2023autisticbehavioras pages 5-7). - Digits: Brachydactyly/polydactyly, reflecting ciliopathy‑related limb bud patterning defects (Genes, 2023) (papuc2023autisticbehavioras pages 5-7). - Brain/CNS: Malformations (e.g., periventricular nodular heterotopia), developmental delay; a 2023 case highlighted autistic behavior as a novel feature in a female with de novo OFD1 variant (Genes, 2023, URL above) (papuc2023autisticbehavioras pages 9-11, papuc2023autisticbehavioras pages 5-7). - Kidney: Cystic kidney disease and progression to renal dysfunction; mechanistically tied to defective primary cilia and autophagy‑ciliogenesis control (HMG, 2020, URL: https://doi.org/10.1093/hmg/ddaa029) (iaconis2020thehopscomplex pages 10-10).

Direct mechanistic details and recent developments (2023–2024 prioritized) - Autophagy–ciliogenesis crosstalk (2023 review): OFD1 resides at centrioles and satellites, and “selective autophagic degradation of ciliary proteins has been shown to control ciliogenesis,” with OFD1 among satellite cargos whose removal licenses cilium assembly (Autophagy, 2023, URL: https://doi.org/10.1080/15548627.2022.2067383) (morleo2023crosstalkbetweencilia pages 9-10). - PKA–Praja2–OFD1 UPS pathway (EMBO J., 2021): “Upon GPCR‑cAMP stimulation, PKA phosphorylates OFD1 at ser735, thus promoting OFD1 proteolysis through the praja2‑UPS circuitry,” a pathway “essential for ciliogenesis,” and a non‑phosphorylatable OFD1 mutant “dramatically affects cilium morphology and dynamics” (URL: https://doi.org/10.15252/embj.2020106503) (senatore2021thetbc1d31praja2complex pages 1-2). - Myosin VI control of OFD1 and CEP164 (EMBO reports, 2022): “Myosin VI regulates the localisation of OFD1 at the centrioles and, as a consequence, the recruitment of the distal appendage protein CEP164… loss of myosin VI triggers a severe defect in ciliogenesis that could be causally linked to an impairment in the autophagic removal of OFD1 from satellites” (URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5). - Arp2/3—OFD1 link (Nature Communications, 2023): “OFD1‑Flag pulled down the purified 7‑subunit Arp2/3 complex,” and “OFD1 functions as a class II Nucleation promoting factor to promote Arp2/3 complex‑mediated actin branching,” providing a cytoskeletal mechanism that integrates actin branching status with ciliogenesis and cell‑cycle control (URL: https://doi.org/10.1038/s41467-023-37340-z) (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4). - Distal appendage/CP110 program (synthesis of experimental literature): Distal appendage proteins (CEP83/CEP164/SCLT1/FBF1) recruit TTBK2 and MARK4, which remove CP110 from the mother centriole to initiate ciliogenesis; OFD1 is required at the distal centriole/appendages for this program to proceed (synopses and experimental context) (ekumi2020biochemicalandcellular pages 24-26, magistrati2022myosinviregulates pages 3-5).

Current applications and real‑world implementations - Renal surveillance and management: Given the risk of renal cystic disease and chronic kidney disease in OFD1 syndrome, clinical sources recommend periodic renal imaging and multidisciplinary management; mechanistic nephrology literature underscores the autophagy–cilia connection in kidney epithelia (Genes, 2023; HMG, 2020; URLs above) (papuc2023autisticbehavioras pages 5-7, iaconis2020thehopscomplex pages 10-10).

Expert opinions and authoritative analyses - Autophagy–cilia field leadership (2023): Morleo et al. synthesize “the current knowledge about [the cilia–autophagy] axis and challenges… as well as the implication for ciliopathies,” explicitly placing OFD1 within autophagy‑regulated ciliogenesis (Autophagy, 2023, URL: https://doi.org/10.1080/15548627.2022.2067383) (morleo2023crosstalkbetweencilia pages 9-10). - UPS signaling at centrosomes (2021): EMBO Journal study establishes a centrosomal transduction unit “that links GPCR signalling to ubiquitylation and proteolysis of the ciliopathy protein OFD1,” setting a paradigm for proteostatic gating of ciliogenesis (URL: https://doi.org/10.15252/embj.2020106503) (senatore2021thetbc1d31praja2complex pages 1-2). - Distal appendage homeostasis and motor coupling (2022): EMBO reports identifies myosin VI as a regulator that tunes OFD1 mobility and CEP164 levels, adding actomyosin regulation to centriole‑distal architecture control (URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5). - Cytoskeletal integration (2023): Nature Communications reveals OFD1 as a class II NPF for Arp2/3, “linking actin filament branching surveillance” to ciliogenesis and cell‑cycle transitions (URL: https://doi.org/10.1038/s41467-023-37340-z) (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4).

Relevant statistics and data - Experimental quantitation: Myosin VI depletion increased OFD1 and CEP164 intensities at centrioles in cultured cells with n>140 cells per condition and p‑values reported, demonstrating robust effects on distal appendage homeostasis (EMBO reports, 2022, URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 3-5). - Clinical spectrum: OFD1 is consistently characterized as a multisystem ciliopathy with oral, facial, digital, brain, and renal involvement; recent case documentation extends neurobehavioral features to include autistic behavior in a female with de novo OFD1 variant (Genes, 2023, URL: https://doi.org/10.3390/genes14020327) (papuc2023autisticbehavioras pages 9-11, papuc2023autisticbehavioras pages 5-7).

Evidence artifact | Mechanistic theme | Specific finding | Experimental system/context | Key molecules | Implication for OFD1 disease | Citation (journal, year) | DOI/URL | |---|---|---|---|---|---|---| | Autophagy-mediated OFD1 clearance | Selective autophagic removal of OFD1 from centriolar satellites is required to initiate ciliogenesis | Cell culture (serum starvation), animal models (Medaka), reviews | OFD1, ATG proteins, LC3 (centriolar satellite pool), CP110 (downstream) | Failure to clear OFD1 → blocked ciliogenesis → ciliopathy phenotypes (kidney cysts, brain malformations) | Autophagy, 2023 (morleo2023crosstalkbetweencilia pages 9-10), Hum Mol Genet, 2020 (iaconis2020thehopscomplex pages 10-10) | https://doi.org/10.1080/15548627.2022.2067383 | | PKA–Praja2 ubiquitylation of OFD1 | PKA phosphorylation (Ser735) promotes PRAJA2-mediated ubiquitylation and proteasomal degradation of OFD1 linking GPCR–cAMP to ciliogenesis control | Serum-deprived cells; Medaka in vivo perturbation | OFD1 (pSer735), PKA, PRAJA2 (E3), TBC1D31 | Misregulation → altered OFD1 stability and defective cilium morphology/dynamics → developmental defects | The EMBO Journal, 2021 (senatore2021thetbc1d31praja2complex pages 1-2) | https://doi.org/10.15252/embj.2020106503 | | Myosin VI promotes OFD1 turnover and distal appendage homeostasis | Myosin VI binds OFD1 and promotes its turnover at centrioles; myosin VI depletion increases OFD1 and CEP164 at centrioles and impairs ciliogenesis | Human non-tumoral cell lines; IF, FRAP, biochemical pull-downs | OFD1, Myosin VI, CEP164, PCM1 | Perturbed myosin VI → OFD1 accumulation/altered CEP164 recruitment → defective distal appendage function and ciliogenesis | EMBO Reports, 2022 (magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5) | https://doi.org/10.15252/embr.202154160 | | VPS39 (HOPS) links endolysosomal/autophagy machinery to ciliogenesis | VPS39 (HOPS) controls autophagy-dependent regulation of centriolar satellite proteins, affecting OFD1 distribution and ciliogenesis | Human renal cells; medaka in vivo models | VPS39 (HOPS), OFD1, autophagy components (LC3, lysosomal machinery) | Dysregulated VPS39/autophagy → altered OFD1 satellite pool → defective ciliogenesis, kidney ciliopathy phenotypes | Human Molecular Genetics, 2020 (iaconis2020thehopscomplex pages 10-10, iaconis2020thehopscomplex pages 9-10) | https://doi.org/10.1093/hmg/ddaa029 | | OFD1–Arp2/3 / actin branching link | OFD1 directly binds Arp2/3 and acts as a class II nucleation promoting factor to promote centrosomal actin branching; OFD1 loss reduces centrosomal F-actin | Biochemistry (pulldown, actin polymerization assays), cultured cells (HeLa, MEFs) | OFD1, Arp2/3 complex (ARP2/ARP3/ARPC2), actin | Loss of OFD1 → reduced centrosomal actin branching → impacts ciliogenesis and cell-cycle coupling; provides mechanistic link to cytoskeleton-dependent ciliogenesis | Nature Communications, 2023 (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4) | https://doi.org/10.1038/s41467-023-37340-z | | Distal appendage (CEP164/TTBK2) and CP110 removal program | Distal appendage proteins (Cep83/Cep164/SCLT1/FBF1) recruit kinases (TTBK2/MARK4) to trigger CP110 removal from the mother centriole; OFD1 is required for distal centriole/appendage assembly | Cell biology studies, reviews, IF and molecular perturbation assays | CEP164, TTBK2, MARK4, CP110, OFD1, C2CD3 | Improper OFD1 function/distribution → defective distal appendage assembly, failed CP110 removal → blocked axoneme elongation and ciliogenesis | (mechanistic reviews/experimental reports) EMBO Reports 2022, Ekumi 2020 (magistrati2022myosinviregulates pages 3-5, ekumi2020biochemicalandcellular pages 24-26) | https://doi.org/10.15252/embr.202154160 | | Disrupted ciliary signaling (Hedgehog/Wnt) after OFD1 loss | OFD1 deficiency perturbs cilia-dependent signaling (Shh/Hedgehog and Wnt) during development, contributing to brain and craniofacial defects | Cellular models and developmental/animal studies; genetic analyses | OFD1, components of SHH and WNT pathways, IFT machinery | Altered signaling → neurodevelopmental malformations, midline/brain defects, patterning abnormalities seen in OFD1 patients | Genes, 2023 (ekumi2020biochemicalandcellular pages 24-26, papuc2023autisticbehavioras pages 5-7) | https://doi.org/10.3390/genes14020327 | | Clinical application: kidney replacement in OFD1-related ESKD | Reports document progression to end-stage kidney disease (ESKD) in OFD1 patients and case descriptions of kidney transplantation in affected individuals | Case reports / case series (clinical transplant reports) | OFD1 (genetic diagnosis), clinical management teams | Kidney transplantation has been performed in OFD1-related ESKD; highlights need for renal surveillance and multidisciplinary care | BMC Pediatrics / clinical case series, 2024 (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7) | https://doi.org/10.1186/s12887-024-05304-x |

Table: Key mechanistic themes, experimental contexts, molecular players, disease implications, and primary citations (context IDs) summarizing OFD1-related pathophysiology from the gathered evidence.

Ontology‑ready annotations (narrative labels) - Gene/protein (HGNC): OFD1; CEP164; CEP83; SCLT1; FBF1; TTBK2; MARK4; CP110; PCM1; MYO6; VPS39; PRKACA/PRKACB; PJA2; ACTR2/ACTR3/ARPCs (iaconis2020thehopscomplex pages 10-10, magistrati2022myosinviregulates pages 3-5, cao2023anactinfilament pages 1-2, senatore2021thetbc1d31praja2complex pages 1-2). - Biological process (GO): cilium assembly; ciliary transition from CP110‑capped basal body to axoneme initiation; distal appendage organization; centriolar satellite organization; selective macroautophagy; ubiquitin‑dependent protein catabolism; GPCR–cAMP–PKA signaling; actin filament branching via Arp2/3; Hedgehog/Wnt signal transduction (morleo2023crosstalkbetweencilia pages 9-10, ekumi2020biochemicalandcellular pages 24-26, cao2023anactinfilament pages 1-2, senatore2021thetbc1d31praja2complex pages 1-2). - Cellular component (GO): centriole/basal body distal appendage; centriolar satellite; transition zone; primary cilium; autophagosome; pericentriolar actin network (magistrati2022myosinviregulates pages 3-5, iaconis2020thehopscomplex pages 10-10, cao2023anactinfilament pages 1-2). - Phenotype (HP): oral cavity malformations (e.g., lobulated tongue, cleft palate), facial dysmorphism, digital anomalies, brain malformations/neurodevelopmental delay, renal cystic disease; emerging neurobehavioral feature: autistic behavior (papuc2023autisticbehavioras pages 5-7, papuc2023autisticbehavioras pages 9-11). - Cell types (CL): renal tubular epithelial cells; neural progenitors/neurons; craniofacial epithelial/mesenchymal cells (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7). - Anatomy (UBERON): kidney; brain; craniofacial/oral tissues; limb/digits; centrosome/basal body; transition zone (iaconis2020thehopscomplex pages 10-10, papuc2023autisticbehavioras pages 5-7). - Chemicals (CHEBI): cAMP; actin (G‑actin/F‑actin polymers) (senatore2021thetbc1d31praja2complex pages 1-2, cao2023anactinfilament pages 1-2).

Selected direct quotes supporting key statements - “Upon GPCR‑cAMP stimulation, PKA phosphorylates OFD1 at ser735, thus promoting OFD1 proteolysis through the praja2‑UPS circuitry… This pathway is essential for ciliogenesis.” (EMBO Journal, 2021; URL: https://doi.org/10.15252/embj.2020106503) (senatore2021thetbc1d31praja2complex pages 1-2). - “Myosin VI regulates the localisation of OFD1 at the centrioles and, as a consequence, the recruitment of the distal appendage protein cep164… loss of myosin VI triggers a severe defect in ciliogenesis that could be causally linked to an impairment in the autophagic removal of OFD1 from satellites.” (EMBO reports, 2022; URL: https://doi.org/10.15252/embr.202154160) (magistrati2022myosinviregulates pages 9-10). - “OFD1‑Flag pulled down the purified 7‑subunit Arp2/3 complex,” and “OFD1 functions as a class II Nucleation promoting factor to promote Arp2/3 complex‑mediated actin branching.” (Nature Communications, 2023; URL: https://doi.org/10.1038/s41467-023-37340-z) (cao2023anactinfilament pages 3-4, cao2023anactinfilament pages 1-2).

Limitations - Some genotype–phenotype correlations (e.g., exon‑level associations, X‑inactivation details) and clinical management statistics require broader clinical cohorts; we cite recent case‑level and mechanistic sources within 2020–2024, but comprehensive epidemiology was not available in the retrieved context (papuc2023autisticbehavioras pages 5-7).

References (with URLs and publication dates) - Morleo M. et al. Crosstalk between cilia and autophagy: implication for human diseases. Autophagy. 2023 May;19:24–43. URL: https://doi.org/10.1080/15548627.2022.2067383 (morleo2023crosstalkbetweencilia pages 9-10). - Senatore E. et al. The TBC1D31/praja2 complex controls primary ciliogenesis through PKA‑directed OFD1 ubiquitylation. The EMBO Journal. 2021 May 2;40(10). URL: https://doi.org/10.15252/embj.2020106503 (senatore2021thetbc1d31praja2complex pages 1-2). - Magistrati E. et al. Myosin VI regulates ciliogenesis by promoting the turnover of the centrosomal/satellite protein OFD1. EMBO Reports. 2022 Dec;23(3). URL: https://doi.org/10.15252/embr.202154160 (magistrati2022myosinviregulates pages 9-10, magistrati2022myosinviregulates pages 3-5). - Iaconis D. et al. The HOPS complex subunit VPS39 controls ciliogenesis through autophagy. Human Molecular Genetics. 2020 Feb;29(6):1018–1029. URL: https://doi.org/10.1093/hmg/ddaa029 (iaconis2020thehopscomplex pages 10-10, iaconis2020thehopscomplex pages 9-10). - Cao M. et al. An actin filament branching surveillance system regulates cell cycle progression, cytokinesis and primary ciliogenesis. Nature Communications. 2023 Mar;14: (article number). URL: https://doi.org/10.1038/s41467-023-37340-z (cao2023anactinfilament pages 1-2, cao2023anactinfilament pages 3-4). - Papuc S.M. et al. Autistic Behavior as Novel Clinical Finding in OFD1 Syndrome. Genes. 2023 Jan;14(2):327. URL: https://doi.org/10.3390/genes14020327 (papuc2023autisticbehavioras pages 9-11, papuc2023autisticbehavioras pages 5-7). - Additional mechanistic synopsis (distal appendages/CP110 program): distal appendage proteins recruit TTBK2/MARK4 to remove CP110 and initiate ciliogenesis; OFD1 supports distal centriole/appendage assembly (context synthesis from retrieved sources) (ekumi2020biochemicalandcellular pages 24-26, magistrati2022myosinviregulates pages 3-5).

References

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