SPL Insufficiency Syndrome (SPLIS)/NPHS14: a SPLIS Observational Study and Patient Registry (International)

Official title

Sphingosine Phosphate Lyase Insufficiency Syndrome - Observational Study and Patient Registry (International)

Overview

This protocol aims to gather information about sphingosine phosphate lyase insufficiency syndrome (SPLIS), also known as NPHS14, and to create a SPLIS patient registry. Medical records, radiological and pathology results, blood test results, and genetic information will be collected. Samples of blood, cheek cells, urine and stool may be collected for analysis. If a skin biopsy has been performed for medical care, cells from the biopsy may be analyzed. No treatment or other intervention is involved in this study. However, the effect of treatments administered by the patient's physician may be detected and monitored based on changes in the blood or urine.

Detailed description

This protocol aims to gather information about sphingosine phosphate lyase insufficiency syndrome (SPLIS), a condition also known as NPHS14 or familial steroid-resistant nephrotic syndrome with adrenal insufficiency. SPLIS is a recently discovered genetic disease caused by recessive mutations in the SGPL1 gene. SPLIS can have effects on the kidney, adrenal gland, brain, skin, and blood cells. Some patients with SPLIS do not survive beyond infancy, whereas others live to adulthood. By monitoring the natural history of SPLIS over time in affected patients, the investigators will establish a clinical baseline that reflects how the disease progresses over time. This information may be useful in future clinical trials. The results may reveal which types of SGPL1 mutations correlate with best and worst patient outcomes. Some SPLIS patients are current on a regimen of high dose vitamin B6 supplementation on the advice of their treating physician. By including patients treated with B6, our study may provide evidence for the impact of B6 treatment on biochemical and blood markers of the disease. Our overall goals are to characterize the clinical, biochemical and metabolic manifestations of SPLIS and how these manifestations change over time within individuals with this condition.

Interventions

• Other no intervention
  No interventions are involved in this observational study.

Primary outcome measures

• Survival [Time frame: 0-99 years]

Secondary outcome measures (1)

• Onset of nephrotic syndrome [Time frame: 0-99 years]

Eligibility criteria

Inclusion Criteria: Individuals of all ages diagnosed with SPLIS based on bi-allelic pathogenic variants of SGPL1, including children and neonates, as well as family members or caregivers, healthy volunteers and individuals with other sphingolipidoses.

Exclusion Criteria: the investigators will not include:

• prisoners
• pregnant women
• healthy volunteers with:

• diabetes,
• infection,
• fever,
• known HIV/AIDS,
• cardiac disease
• or anemia.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: Yes

Study design

Observational model

Case-control

Study locations

United States · 1 center

• University of California San Francisco — San Francisco

Publications

• Lovric S, Goncalves S, Gee HY, Oskouian B, Srinivas H, Choi WI, Shril S, Ashraf S, Tan W, Rao J, Airik M, Schapiro D, Braun DA, Sadowski CE, Widmeier E, Jobst-Schwan T, Schmidt JM, Girik V, Capitani G, Suh JH, Lachaussee N, Arrondel C, Patat J, Gribouval O, Furlano M, Boyer O, Schmitt A, Vuiblet V, Hashmi S, Wilcken R, Bernier FP, Innes AM, Parboosingh JS, Lamont RE, Midgley JP, Wright N, Majewski PMID 28165339
• Prasad R, Hadjidemetriou I, Maharaj A, Meimaridou E, Buonocore F, Saleem M, Hurcombe J, Bierzynska A, Barbagelata E, Bergada I, Cassinelli H, Das U, Krone R, Hacihamdioglu B, Sari E, Yesilkaya E, Storr HL, Clemente M, Fernandez-Cancio M, Camats N, Ram N, Achermann JC, Van Veldhoven PP, Guasti L, Braslavsky D, Guran T, Metherell LA. Sphingosine-1-phosphate lyase mutations cause primary adrenal insu PMID 28165343
• Weaver KN, Sullivan B, Hildebrandt F, Strober J, Prasad R, Saba J, Samuel M, Hegele R, McIntyre A. Sphingosine Phosphate Lyase Insufficiency Syndrome. 2020 Oct 15 [updated 2026 Apr 9]. In: Adam MP, Bick S, Mirzaa GM, Pagon RA, Wallace SE, Amemiya A, editors. GeneReviews(R) [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2026. Available from http://www.ncbi.nlm.nih.gov/books/NBK56 PMID 33074640
• Choi YJ, Saba JD. Sphingosine phosphate lyase insufficiency syndrome (SPLIS): A novel inborn error of sphingolipid metabolism. Adv Biol Regul. 2019 Jan;71:128-140. doi: 10.1016/j.jbior.2018.09.004. Epub 2018 Sep 25. PMID 30274713
• Zhao P, Liu ID, Hodgin JB, Benke PI, Selva J, Torta F, Wenk MR, Endrizzi JA, West O, Ou W, Tang E, Goh DL, Tay SK, Yap HK, Loh A, Weaver N, Sullivan B, Larson A, Cooper MA, Alhasan K, Alangari AA, Salim S, Gumus E, Chen K, Zenker M, Hildebrandt F, Saba JD. Responsiveness of sphingosine phosphate lyase insufficiency syndrome to vitamin B6 cofactor supplementation. J Inherit Metab Dis. 2020 Sep;43(5 PMID 32233035
• Martin KW, Weaver N, Alhasan K, Gumus E, Sullivan BR, Zenker M, Hildebrandt F, Saba JD. MRI Spectrum of Brain Involvement in Sphingosine-1-Phosphate Lyase Insufficiency Syndrome. AJNR Am J Neuroradiol. 2020 Oct;41(10):1943-1948. doi: 10.3174/ajnr.A6746. Epub 2020 Aug 27. PMID 32855188
• Zhao P, Tassew GB, Lee JY, Oskouian B, Munoz DP, Hodgin JB, Watson GL, Tang F, Wang JY, Luo J, Yang Y, King S, Krauss RM, Keller N, Saba JD. Efficacy of AAV9-mediated SGPL1 gene transfer in a mouse model of S1P lyase insufficiency syndrome. JCI Insight. 2021 Apr 22;6(8):e145936. doi: 10.1172/jci.insight.145936. PMID 33755599

Identifiers

NCT: NCT04885179 · 20-32291

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗