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Marhoon SE, Ali AH, Husain A, Alsudan AA, Elshabrawy EG. IFT140 Mutation and End-Stage Renal Disease in Mainzer-Saldino Syndrome: A Case Report. Cureus 2024; 16:e53889. [PMID: 38465144 PMCID: PMC10925067 DOI: 10.7759/cureus.53889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/08/2024] [Indexed: 03/12/2024] Open
Abstract
Mainzer-Saldino syndrome (MSS) or conorenal syndrome (CRS) is a rare autosomal recessive ciliopathy characterized by multiorgan affection, typically presents with a triad of nephronophthisis (NPHP), retinitis pigmentosa (RP), and cone-shaped epiphysis (CSE) with varying degrees of severity. A 20-month-old male is experiencing recurrent pneumonia attacks, an elevated serum creatinine level, proteinuria, and high anion gap partially compensated metabolic acidosis were incidentally discovered during one of his hospitalizations. A biopsy was performed, and the results supported the diagnosis of Alport syndrome. However, a subsequent genetic test suggests the presence of MSS. Aside from NPHP, RP and CSE tested positive. Based on the fact that MSS is not a common cause of end-stage renal disease (ESRD) in pediatrics, physicians should bear in mind genetic testing as a decisive tool. In this context, we highlighted a case of an accidentally discovered impaired renal function from first presentation to final diagnosis, with a valuable comparison with previously published similar cases.
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Affiliation(s)
| | - Ali H Ali
- College of Medicine, Mansoura University, Mansoura, EGY
| | - Ali Husain
- College of Medicine, Mansoura University, Mansoura, EGY
| | - Ali A Alsudan
- Pediatrics, Maternity and Children's Hospital, Dammam, SAU
| | - Eman G Elshabrawy
- Pediatric Nephrology, Mansoura University Children Hospital, Mansoura, EGY
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Gupta M, Pazour GJ. Intraflagellar transport: A critical player in photoreceptor development and the pathogenesis of retinal degenerative diseases. Cytoskeleton (Hoboken) 2023:10.1002/cm.21823. [PMID: 38140908 PMCID: PMC11193844 DOI: 10.1002/cm.21823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 12/01/2023] [Accepted: 12/08/2023] [Indexed: 12/24/2023]
Abstract
In vertebrate vision, photons are detected by highly specialized sensory cilia called outer segments. Photoreceptor outer segments form by remodeling the membrane of a primary cilium into a stack of flattened disks. Intraflagellar transport (IFT) is critical to the formation of most types of eukaryotic cilia including the outer segments. This review covers the state of knowledge of the role of IFT in the formation and maintenance of outer segments and the human diseases that result from mutations in genes encoding the IFT complex and associated motors.
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Affiliation(s)
- Mohona Gupta
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Suite 213 Biotech II, 373 Plantation Street, Worcester MA USA 01605
- Morningside Graduate School of Biological Sciences, University of Massachusetts Chan Medical School, 55 Lake Avenue North, Worcester MA USA 01655
| | - Gregory J. Pazour
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Suite 213 Biotech II, 373 Plantation Street, Worcester MA USA 01605
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Patel SH, Bakhsh S, Conboy E, Hajrasouliha AR. Case of IFT140-associated Mainzer Saldino Syndrome. Ophthalmic Genet 2023; 44:208-210. [PMID: 36063079 DOI: 10.1080/13816810.2022.2113545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Shivam H Patel
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Saaquib Bakhsh
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Erin Conboy
- Department of Medical and Molecular Genetics and Pediatrics, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Amir R Hajrasouliha
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN, United States
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Yeh TC, Niu DM, Cheng HC, Chen YR, Chen LZ, Tsui SP, Liao TWE, Wang AG, Yang CF. Novel mutation of IFT140 in an infant with Mainzer-Saldino syndrome presenting with retinal dystrophy. Mol Genet Metab Rep 2022; 33:100937. [PMID: 36393898 PMCID: PMC9646644 DOI: 10.1016/j.ymgmr.2022.100937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 11/01/2022] [Accepted: 11/02/2022] [Indexed: 11/10/2022] Open
Abstract
A seven-month-old girl presented with bilateral roving nystagmus, hyperopia, and retinal dystrophy, and was brought to our ophthalmology clinic. Visual-evoked potentials (VEPs) were non-recordable in both the eyes. No other systemic symptoms or abnormalities were observed. Whole exome sequencing (WES) identified a compound heterozygous mutation in the IFT140 gene: c.1990G > A (p. Glu664Lys) and c.2214_2217del (p.Asp738GlufsTer47). The genetic results support a diagnosis of Mainzer-Saldino syndrome (MSS). Importantly, c.2214_2217del is a novel mutation in the IFT140 gene. Although the patient presents with isolated retinal dystrophy, it is crucial to monitor renal function overtime. Taken together, our results reinforce the role of IFT140 in syndromic ciliopathies. This report also highlights the role of combined WES approaches in identifying underlying mutations in infants presenting with isolated retinal dystrophy, considering MSS may present differently over time. A novel mutation in IFT140 was found to cause Mainzer-Saldino syndrome (MSS). MSS may present as isolated retinal dystrophy in infant, and genetic testing plays a crucial role in diagnosis. Patients with MSS should receive systemic follow-up, particularly renal function.
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Affiliation(s)
- Tsai-Chu Yeh
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Dau-Ming Niu
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Department of Pediatrics, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Hui-Chen Cheng
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Program in Molecular Medicine, College of Life Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Department of Life Sciences and Institute of Genome Sciences, College of Life Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Brain Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Yun-Ru Chen
- Department of Pediatrics, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Li-Zhen Chen
- Department of Pediatrics, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Shu-Ping Tsui
- Department of Pediatrics, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Ting-Wei Ernie Liao
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Department of Pediatrics, Taipei Veterans General Hospital, Taipei, Taiwan
| | - An-Guor Wang
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Chia-Feng Yang
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Department of Pediatrics, Taipei Veterans General Hospital, Taipei, Taiwan
- Corresponding author at: Department of Pediatrics, Taipei Veterans General Hospital, No. 201, Sec.2, Shih-Pai Road, Taipei 11217, Taiwan.
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Romano F, Dautaj A, Esposito RA, Bertelli M, Staurenghi G, Salvetti AP. Multimodal imaging of retinitis pigmentosa associated with Mainzer-Saldino syndrome. Ophthalmic Genet 2021; 42:218-221. [PMID: 33393400 DOI: 10.1080/13816810.2020.1867755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Background: Syndromic ciliopathies have been variably linked to different retinal dystrophies. However, to date, few reports have characterized by means of multimodal imaging the retinal degeneration occurring in Mainzer-Saldino syndrome (MSS).Methods: Two siblings with history of kidney disease and other systemic abnormalities presented at our eye clinic in October 2017 complaining of night blindness and visual loss. They underwent a complete ophthalmologic examination including visual acuity (VA) assessment, optical coherence tomography (OCT) and blue-light autofluorescence (BAF). A screen for inherited retinal dystrophies was performed in this occasion.Results: At baseline, the youngest sister had slightly worse VA (20/30 vs. 20/20-25 Snellen equivalents). On fundoscopy, both siblings had severe thinning of the peripheral retina, attenuation of retinal vessels and widespread accumulation of pigmented deposits. Significant outer retinal atrophy with apparent foveal sparing was appreciable on OCT.During the 3 years of follow-up, vision remained overall stable in both patients whereas minimal progression of outer retinal atrophy was observed by means of OCT. Genetic analysis revealed compound heterozygosity in the IFT172 gene. Based on these findings, a diagnosis of retinitis pigmentosa (RP) associated with MSS was formulated.Conclusions: Our report describes the cases of two siblings affected by retinitis pigmentosa associated with MSS. Although both carrying the same mutations and a severe RP phenotype, the youngest sister had slightly more advanced retinal degeneration highlighting the remarkable variability related to the IFT172 retinopathy.
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Affiliation(s)
- Francesco Romano
- Eye Clinic, Department of Biomedical and Clinical Science, Luigi Sacco Hospital, University of Milan, Milan, Italy
| | | | - Raffaele Antonio Esposito
- Eye Clinic, Department of Biomedical and Clinical Science, Luigi Sacco Hospital, University of Milan, Milan, Italy
| | | | - Giovanni Staurenghi
- Eye Clinic, Department of Biomedical and Clinical Science, Luigi Sacco Hospital, University of Milan, Milan, Italy
| | - Anna Paola Salvetti
- Eye Clinic, Department of Biomedical and Clinical Science, Luigi Sacco Hospital, University of Milan, Milan, Italy
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