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Fanconi_Anemia

Disease Pathophysiology Research Report

2026-02-14
Falcon MONDO:0019391 Model: Edison Scientific Literature 28 citations

Disease Pathophysiology Research Report

Target Disease

  • Disease Name: Fanconi Anemia (FA)
  • MONDO ID: MONDO:0019391
  • Category: Genetic (DNA repair disorder)

Pathophysiology Description (Narrative)

Fanconi anemia is a genomic instability syndrome caused by biallelic pathogenic variants in genes encoding the FA/BRCA DNA interstrand crosslink (ICL) repair pathway. The central biochemical lesion is the DNA ICL, which stalls replication and transcription, provoking replication fork collapse, chromosomal breakage, and activation of checkpoint signaling. The FA core complex (FANCA, FANCB, FANCC, FANCE, FANCF, FANCG, FANCL, plus FAAPs) recognizes ICL-stalled forks and catalyzes the monoubiquitination of the FANCD2–FANCI (I-D2) complex via the E3 ligase FANCL and the E2 UBE2T (FANCT). Monoubiquitinated I-D2 localizes to damaged chromatin and orchestrates nuclease-mediated “unhooking” (e.g., SLX4/FANCP scaffolding XPF–ERCC1 and SLX1), translesion synthesis (TLS, Polζ with FANCV/REV7), and homologous recombination (HR) to complete repair; the cycle is reset by USP1-mediated deubiquitination. FA proteins also protect stressed forks, interface with ATR/CHK1 signaling, and contribute to mitotic integrity (ultrafine bridges), explaining the broad chromosomal instability and cancer predisposition in FA (URL: https://doi.org/10.1182/blood-2014-04-526293; Oct 2014) (longerich2014stressanddna pages 4-5, longerich2014stressanddna pages 7-8). Recent work further shows that PCNA monoubiquitination at K164 is critical to canalize ICL repair toward canonical FA/TLS: in its absence, MSH2–MSH6 mismatch repair is mis-recruited to ICLs, and combined PcnaK164R and FA deficiency is embryonic lethal, highlighting a dual role of PCNA-Ub in polymerase switching and pathway choice (URL: https://doi.org/10.1093/pnasnexus/pgae242; Jun 2024) (shah2024dualroleof pages 1-2).

Endogenous aldehydes are major physiological sources of crosslinking and DNA–protein crosslink damage in hematopoietic stem cells (HSCs). A two-tier protection model has emerged: tier-1 detoxification by ADH5 (formaldehyde) and ALDH2 (acetaldehyde), and tier-2 removal of aldehyde-induced lesions by the FA repair pathway. In humans with FA, the dominant-negative ALDH2*2 variant accelerates progression of bone marrow failure, underscoring aldehyde burden as a disease modifier and therapeutic target (URL: https://doi.org/10.1182/blood-2013-06-507962; Oct 2013) (hira2013variantaldh2is pages 1-2). Reviews and mechanistic syntheses concur that aldehyde genotoxicity, replication stress with ATR activation, and chronic inflammatory/oxidative milieus converge to drive HSC attrition, myelodysplasia/AML, and squamous carcinogenesis (URLs: https://doi.org/10.3390/ijms252111619; Oct 2024; https://doi.org/10.1146/annurev-pathmechdis-111523-023420; Jan 2025; https://doi.org/10.1186/s13023-025-03896-w; Jul 2025) (repczynska2024newinsightsinto pages 9-13, repczynska2024newinsightsinto pages 13-17, liu2025inheritedpredispositionsto pages 13-15, fang2025comprehensivereviewon pages 1-3).

Two 2024 advances refine FA pathophysiology and therapeutic angles: (1) fetal HSC failure originates in the fetal liver from inflammation-driven ER stress and proteostasis disruption in LT-HSCs; restoring protein folding with the chemical chaperone TUDCA and dampening type I interferon signaling rescue fetal Fancd2−/− LT-HSC pool size, identifying proteostasis/inflammation as actionable nodes (URL: https://doi.org/10.1038/s41467-024-46159-1; Feb 2024) (kovuru2024deregulatedproteinhomeostasis pages 10-11). (2) In head and neck squamous cell carcinoma (HNSCC), KMT2D loss increases glycolysis and, under glycolytic inhibition, epigenetically suppresses FA/BRCA gene expression by converting FA gene promoters/enhancers to inactive states; combining 2-deoxyglucose with DNA crosslinkers or PARP inhibitors preferentially suppresses KMT2D-deficient tumors, linking metabolic state, chromatin, and FA pathway competence (URL: https://doi.org/10.1038/s41467-024-50861-5; Aug 2024) (liu2024histonemethyltransferasekmt2ddeficiency pages 1-2).

1. Core Pathophysiology

2. Key Molecular Players

3. Biological Processes (GO terms; disrupted in FA)

4. Cellular Components (GO CC)

5. Disease Progression (Sequence of events)

1) Initiating lesions: endogenous aldehydes (acetaldehyde/formaldehyde) and oxidative metabolism generate ICLs and DPCs in HSCs; detoxification capacity (ALDH2/ADH5) modulates burden (human ALDH2*2 accelerates BMF) (hira2013variantaldh2is pages 1-2, repczynska2024newinsightsinto pages 13-17). 2) Repair failure at replication: defective FA core recruitment and I-D2 monoubiquitination limit nuclease unhooking, TLS insertion across unhooked adduct, and HR-mediated restoration; ATR/CHK signaling becomes chronically engaged (longerich2014stressanddna pages 4-5, longerich2014stressanddna pages 7-8, liu2025inheritedpredispositionsto pages 13-15). 3) Cellular outcomes: fork collapse, chromosomal breakage, mitotic bridge formation; TP53 activation and apoptotic attrition of HSCs; chronic ROS/inflammatory signaling exacerbate senescence and HSC pool depletion (longerich2014stressanddna pages 7-8, liu2025inheritedpredispositionsto pages 13-15, repczynska2024newinsightsinto pages 9-13). 4) Developmental window: fetal liver LT-HSCs are particularly vulnerable due to inflammation-driven ER stress and proteostasis breakdown; TUDCA and type I interferon dampening rescue fetal LT-HSC numbers in Fancd2−/− (kovuru2024deregulatedproteinhomeostasis pages 10-11). 5) Malignant evolution: persistent genomic instability and replication stress select for clones tolerating checkpoints, predisposing to MDS/AML and early-onset squamous cell carcinomas of the oral/anogenital/upper aerodigestive tract (liu2025inheritedpredispositionsto pages 13-15, fang2025comprehensivereviewon pages 1-3).

6. Phenotypic Manifestations (Mechanism links)

Current Applications and Real-World Implementations

Expert Opinions and Analysis (Authoritative sources)

Relevant Statistics and Data (recent)

Gene/Protein Annotations (selected; HGNC with key roles)

Phenotype Associations (HP terms)

Cell Type Involvement (CL terms)

Anatomical Locations (UBERON)

Chemical Entities (CHEBI)

Evidence Items (PMIDs/DOIs, URLs, dates)

Concluding Remarks

FA pathogenesis is anchored in defective ICL repair at the replication fork, compounded by endogenous aldehyde genotoxicity, replication stress/ATR signaling, and context-specific inflammatory and metabolic stresses in hematopoietic and epithelial compartments. 2023–2024 research adds mechanistic layers: fetal liver proteostasis–interferon circuits driving LT-HSC loss and an epigenetic–metabolic axis that tunes FA gene expression and therapeutic response in SCC. Together, these advances refine targets for intervention—detoxification/alcohol counseling, fetal-stage proteostasis/innate immune modulation, and tumor-context metabolic–epigenetic therapies—while preserving the centrality of the FA/BRCA repair pathway in both marrow failure and cancer risk (longerich2014stressanddna pages 4-5, hira2013variantaldh2is pages 1-2, kovuru2024deregulatedproteinhomeostasis pages 10-11, liu2024histonemethyltransferasekmt2ddeficiency pages 1-2).

References

  1. (longerich2014stressanddna pages 4-5): Simonne Longerich, Jian Li, Yong Xiong, Patrick Sung, and Gary M. Kupfer. Stress and dna repair biology of the fanconi anemia pathway. Blood, 124 18:2812-9, Oct 2014. URL: https://doi.org/10.1182/blood-2014-04-526293, doi:10.1182/blood-2014-04-526293. This article has 106 citations and is from a highest quality peer-reviewed journal.

  2. (longerich2014stressanddna pages 7-8): Simonne Longerich, Jian Li, Yong Xiong, Patrick Sung, and Gary M. Kupfer. Stress and dna repair biology of the fanconi anemia pathway. Blood, 124 18:2812-9, Oct 2014. URL: https://doi.org/10.1182/blood-2014-04-526293, doi:10.1182/blood-2014-04-526293. This article has 106 citations and is from a highest quality peer-reviewed journal.

  3. (shah2024dualroleof pages 1-2): Ronak Shah, Muhammad Assad Aslam, Aldo Spanjaard, Daniel de Groot, Lisa M Zürcher, Maarten Altelaar, Liesbeth Hoekman, Colin E J Pritchard, Bas Pilzecker, Paul C M van den Berk, and Heinz Jacobs. Dual role of proliferating cell nuclear antigen monoubiquitination in facilitating fanconi anemia-mediated interstrand crosslink repair. PNAS Nexus, Jun 2024. URL: https://doi.org/10.1093/pnasnexus/pgae242, doi:10.1093/pnasnexus/pgae242. This article has 0 citations and is from a peer-reviewed journal.

  4. (hira2013variantaldh2is pages 1-2): Asuka Hira, Hiromasa Yabe, Kenichi Yoshida, Yusuke Okuno, Yuichi Shiraishi, Kenichi Chiba, Hiroko Tanaka, Satoru Miyano, Jun Nakamura, Seiji Kojima, Seishi Ogawa, Keitaro Matsuo, Minoru Takata, and Miharu Yabe. Variant aldh2 is associated with accelerated progression of bone marrow failure in japanese fanconi anemia patients. Blood, 122 18:3206-9, Oct 2013. URL: https://doi.org/10.1182/blood-2013-06-507962, doi:10.1182/blood-2013-06-507962. This article has 213 citations and is from a highest quality peer-reviewed journal.

  5. (repczynska2024newinsightsinto pages 9-13): Anna Repczynska, Barbara Ciastek, and Olga Haus. New insights into the fanconi anemia pathogenesis: a crosstalk between inflammation and oxidative stress. International Journal of Molecular Sciences, 25:11619, Oct 2024. URL: https://doi.org/10.3390/ijms252111619, doi:10.3390/ijms252111619. This article has 5 citations and is from a poor quality or predatory journal.

  6. (repczynska2024newinsightsinto pages 13-17): Anna Repczynska, Barbara Ciastek, and Olga Haus. New insights into the fanconi anemia pathogenesis: a crosstalk between inflammation and oxidative stress. International Journal of Molecular Sciences, 25:11619, Oct 2024. URL: https://doi.org/10.3390/ijms252111619, doi:10.3390/ijms252111619. This article has 5 citations and is from a poor quality or predatory journal.

  7. (liu2025inheritedpredispositionsto pages 13-15): Yen-Chun Liu, Mohammad K. Eldomery, Jamie L. Maciaszek, and Jeffery M. Klco. Inherited predispositions to myeloid neoplasms: pathogenesis and clinical implications. Annual Review of Pathology: Mechanisms of Disease, 20:87-114, Jan 2025. URL: https://doi.org/10.1146/annurev-pathmechdis-111523-023420, doi:10.1146/annurev-pathmechdis-111523-023420. This article has 7 citations and is from a domain leading peer-reviewed journal.

  8. (fang2025comprehensivereviewon pages 1-3): Chenyan Fang, Zhoujun Zhu, Jun Cao, Jun Huang, and Yipeng Xu. Comprehensive review on fanconi anemia: insights into dna interstrand cross-links, repair pathways, and associated tumors. Orphanet Journal of Rare Diseases, Jul 2025. URL: https://doi.org/10.1186/s13023-025-03896-w, doi:10.1186/s13023-025-03896-w. This article has 4 citations and is from a peer-reviewed journal.

  9. (kovuru2024deregulatedproteinhomeostasis pages 10-11): Narasaiah Kovuru, Makiko Mochizuki-Kashio, Theresa Menna, Greer Jeffrey, Yuning Hong, Young me Yoon, Zhe Zhang, and Peter Kurre. Deregulated protein homeostasis constrains fetal hematopoietic stem cell pool expansion in fanconi anemia. Nature Communications, Feb 2024. URL: https://doi.org/10.1038/s41467-024-46159-1, doi:10.1038/s41467-024-46159-1. This article has 7 citations and is from a highest quality peer-reviewed journal.

  10. (liu2024histonemethyltransferasekmt2ddeficiency pages 1-2): Wei Liu, Hongchao Cao, Jing Wang, Areeg Elmusrati, Bing Han, Wei Chen, Ping Zhou, Xiyao Li, Stephen Keysar, Antonio Jimeno, and Cun-Yu Wang. Histone-methyltransferase kmt2d deficiency impairs the fanconi anemia/brca pathway upon glycolytic inhibition in squamous cell carcinoma. Nature Communications, Aug 2024. URL: https://doi.org/10.1038/s41467-024-50861-5, doi:10.1038/s41467-024-50861-5. This article has 9 citations and is from a highest quality peer-reviewed journal.

  11. (xu2024crosstalkbetweendna pages 7-9): Jian Xu, Peiwen Fei, Dennis W. Simon, Michael J. Morowitz, Parinda A. Mehta, and Wei Du. Crosstalk between dna damage repair and metabolic regulation in hematopoietic stem cells. Cells, 13:733, Apr 2024. URL: https://doi.org/10.3390/cells13090733, doi:10.3390/cells13090733. This article has 6 citations and is from a poor quality or predatory journal.