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Effect of NOTCH2NLC Gene Variations on NIID Clinical Features (NOTCH2NLC-NIID)

24 juni 2026 uppdaterad av: Sichuan Academy of Medical Sciences

This study aims to understand how differences in the NOTCH2NLC gene affect the symptoms and course of neuronal intranuclear inclusion disease (NIID), a rare inherited neurological disorder. NIID is caused by an abnormal expansion of a GGC DNA repeat in the NOTCH2NLC gene, but members of the same family can have very different repeat sizes and patterns, leading to a wide variety of problems-such as difficulties with memory, movement, sensation, or involuntary body functions. The main goal is to uncover how these genetic differences (repeat length and interruption pattern) contribute to the severity and type of symptoms.

The study is being conducted at Sichuan Provincial People's Hospital and will enroll approximately 12 individuals from a single family, including those diagnosed with NIID, family members who carry the genetic change but are not yet sick, and healthy relatives. Participants must be 18-85 years old, able to complete genetic testing and a small skin biopsy, and willing to provide informed consent. Those who are medically unstable or otherwise unable to participate will not be enrolled.

The study has both a retrospective part (collecting past medical records) and a prospective follow-up. At the beginning, all participants will have a physical exam, provide a blood sample (for long-read DNA sequencing and RNA sequencing), and undergo a 3-mm skin biopsy to look for disease-related protein deposits. Brain MRI and nerve/muscle electrical tests will also be performed if not done recently. After this baseline visit, everyone will be followed every 6 months for a total of 2 years (5 visits total). Each follow-up visit includes assessments of thinking, memory, movement, autonomic function, pain, and quality of life, along with a neurological exam and repeat imaging/electrical tests as needed. At the final 24-month visit, another blood sample will be taken for RNA sequencing to see how gene activity changes over time.

This is an observational study; there is no experimental treatment. Participants will be compensated a total of ¥3,000 across all visits for their time and travel. All data and samples will stay in China and will not be shared internationally.

Studieöversikt

Status

Rekrytering

Betingelser

Intervention / Behandling

Studietyp

Observationell

Inskrivning (Beräknad)

12

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studiekontakt

Studieorter

  • Kina
    • Sichuan
      • Chengdu, Sichuan, Kina, 610072
        • Rekrytering
        • Qingyang District
        • Kontakt:

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

  • Barn
  • Vuxen
  • Äldre vuxen

Tar emot friska volontärer

Ja

Testmetod

Icke-sannolikhetsprov

Studera befolkning

This study will enroll approximately 12 participants from a single family (pedigree) with NOTCH2NLC-related neuronal intranuclear inclusion disease (NIID). The study population comprises three categories of family members: individuals with a clinical diagnosis of NIID, asymptomatic carriers of the NOTCH2NLC GGC repeat expansion, and healthy relatives who do not carry the expansion. All participants are adults aged 18 to 85 years recruited from the Health Management Center of Sichuan Provincial People's Hospital in China. Given the rarity and genetic nature of the disease, this single-family design is intended to control for shared genetic background and environmental factors while examining the effect of different GGC repeat characteristics on clinical phenotype.

Beskrivning

Inclusion Criteria:

  • Member of a single family (pedigree) with known NOTCH2NLC-related neuronal intranuclear inclusion disease (NIID), including clinically diagnosed patients, asymptomatic GGC repeat expansion carriers, and healthy relatives without the expansion.
  • Age 18 to 85 years at the time of enrollment.
  • Able and willing to undergo genetic testing for NOTCH2NLC (including long-read sequencing) and a skin punch biopsy.
  • Able to provide written informed consent.

Exclusion Criteria:

  • Unstable vital signs or any acute medical condition that would interfere with study participation.
  • Any condition that, in the opinion of the investigator, makes the participant unsuitable for the study.

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

Kohorter och interventioner

Grupp / Kohort
Intervention / Behandling
NIID Family Cohort
This is a single observational cohort consisting of approximately 12 members of the same family affected by neuronal intranuclear inclusion disease (NIID) caused by GGC repeat expansions in NOTCH2NLC. The cohort includes individuals with clinically diagnosed NIID, asymptomatic carriers of the repeat expansion, and healthy relatives without the expansion. After informed consent, all participants will undergo baseline assessments including clinical evaluation, peripheral blood collection for long-read and transcriptome sequencing, a skin punch biopsy for immunohistochemistry, and brain MRI/neurophysiological tests if clinically indicated. Participants will be followed prospectively every 6 months for 2 years (5 visits total). Follow-up visits include cognitive, motor, autonomic, and quality-of-life assessments, along with neurological examination and repeat imaging/electrophysiology as needed. A second blood sample for transcriptome sequencing will be collected at the 24-month visit. No
Övrig: No Intervention: Observational Cohort
This is an observational study. No investigational drug, device, biologic, or procedure is administered. Participants receive only standard clinical assessments, genetic testing, skin biopsy, and regular follow-up evaluations as described in the protocol.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Clinical Severity Score and Its Correlation with NOTCH2NLC GGC Repeat Characteristics
Tidsram: Baseline and at Months 6, 12, 18, and 24
The primary outcome is a composite clinical severity score that integrates cognitive function (assessed by Mini-Mental State Examination [MMSE] and Montreal Cognitive Assessment [MoCA]), motor function (including extrapyramidal and pyramidal signs), autonomic function (e.g., orthostatic blood pressure changes, heart rate variability), and peripheral nerve function (based on nerve conduction studies and clinical examination). Each domain is rated on a standardized scale, and the total score reflects overall neurological impairment, with higher scores indicating greater severity. The relationship (correlation coefficient) between this score and the NOTCH2NLC GGC repeat number and interruption pattern (defined by long-read sequencing) will be evaluated at baseline and over time.
Baseline and at Months 6, 12, 18, and 24

Samarbetspartners och utredare

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Sponsor

Sichuan Academy of Medical Sciences

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

1 april 2026

Primärt slutförande (Beräknad)

31 december 2028

Avslutad studie (Beräknad)

1 februari 2029

Studieregistreringsdatum

Först inskickad

1 juni 2026

Först inskickad som uppfyllde QC-kriterierna

24 juni 2026

Första postat (Faktisk)

26 juni 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

26 juni 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

24 juni 2026

Senast verifierad

1 juni 2026

Mer information

Termer relaterade till denna studie

Nyckelord

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • IRB No. 305 (2026)

Plan för individuella deltagardata (IPD)

Planerar du att dela individuella deltagardata (IPD)?

NEJ

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