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

October 22, 2025 updated by: University of California, San Francisco

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

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.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

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.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
120

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • United States
    • California
      • San Francisco, California, United States, 94143
        • Recruiting
        • University of California San Francisco
        • Contact:
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

SPLIS is a genetic disorder caused by recessive mutations in SGPL1. The study population includes individuals with confirmed bi-allelic mutations in SGPL1, regardless of age, gender, disease manifestations, or treatments received. Some patients with SPLIS will have kidney failure, adrenal insufficiency and/or neurological problems. Parents, family members and unrelated healthy individuals enrolled during routine health appointments, elective surgical procedures and other medical interactions will be included as healthy controls.

Description

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.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Case-Control
  • Time Perspectives: Cross-Sectional

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Individuals with SPLIS
Individuals diagnosed with SPLIS based on genetic testing that confirms bi-allelic pathogenic variants in SGPL1
Other: no intervention
No interventions are involved in this observational study.
Parents of individuals with SPLIS
Parents of individuals diagnosed with SPLIS based on genetic testing that confirms bi-allelic pathogenic variants in SGPL1
Other: no intervention
No interventions are involved in this observational study.
age and gender-matched controls
The investigators will attempt to collect biological specimens from individuals closely matched to SPLIS patient cohort by age and gender. This group may include siblings, cousins, and unrelated healthy children and adults.
Other: no intervention
No interventions are involved in this observational study.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Survival
Time Frame: 0-99 years
The primary outcome of this study is survival (age at death).
0-99 years

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Onset of nephrotic syndrome
Time Frame: 0-99 years
Age at onset of proteinuria greater than 3.5 grams per 24h
0-99 years

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Onset of primary adrenal insufficiency
Time Frame: 0-99 years
Age at onset of glucocorticoid insufficiency with or without other endocrine defects
0-99 years
Responsiveness of blood sphingolipid levels to vitamin B6 supplementation
Time Frame: 0-99 years
Changes in blood sphingolipid levels before and after caring physician-initiated vitamin B6 supplementation
0-99 years
Skin fibroblast sphingolipid levels in response to vitamin B6
Time Frame: 1-6 weeks
Skin fibroblast sphingolipid levels compared by liquid chromatography/mass spectrometry in medium containing various forms of vitamin B6 or lacking vitamin B6.
1-6 weeks
Responsiveness of absolute lymphocyte count to vitamin B6 supplementation
Time Frame: 0-99 years
Changes in blood absolute lymphocyte count before and after caring physician-initiated vitamin B6
0-99 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of California, San Francisco

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Julie D Saba, MD, PhD, University of California, San Francisco

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 22, 2025

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 30, 2026

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 30, 2028

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 29, 2021

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 7, 2021

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 13, 2021

Study Record Updates

Last Update Posted (Estimated)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
October 24, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 22, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
October 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 20-32291

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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