遺伝的異常のない知的障害の有無を伴う多発性先天性奇形の診断における光学ゲノムマッピング(OGM)の貢献 (CARTOGEN-N)
CARTOGEN-N_全ゲノムシークエンシングで遺伝子異常が検出されなかった、知的障害を伴うまたは伴わない多発性先天性奇形の診断における光学的ゲノムマッピング(OGM)の貢献
Congenital malformations result from an embryonic or foetal developmental disorder (DD) affecting one or more systems (cardiac, skeletal, nervous, etc.). These are referred to as multiple congenital anomalies (MCAs). They may be associated with an intellectual disability (ID)1.
Chromosomal analysis on Chromosomal Microarray Analysis (CMA) and gene panels or exome sequencing are the respective gold standard methods for chromosomal and molecular diagnosis of DD respectively2. In cases where no diagnosis is established after these first-line tests, short-read whole genome sequencing (WGS), via the Plan France Medicine Genomic 2020-2025 (AURAGEN), may be considered. This approach allows for diagnosis in nearly 40% of patients with DD3,4. However, many patients remain in diagnostic deadlock, likely due to the technical limitations of these methods, which potentially be overcome by emerging methodologies such as optical genome mapping (OGM)5,6,7,8,9. The investigators propose to systematically perform OGM in 30 patients presenting with MCA+/-ID who have inconclusive WGS result10.
The main objective is to assess the contribution of OGM in identifying structural variants not detected or poorly characterised by WGS in this clinical context. This work will also contribute to the ongoing of OGM in routine diagnostics and determine its role in the overall genetic diagnosis of MCA+/-ID. Additionally it may lead to the identification of new candidate genes and/or mechanisms of pathogenicity. If the results are promising, further clinical could expand this preliminary work into a larger-scale project. Improving the genetic diagnosis of DD should enhance the medical management of patients, currently in diagnostic deadlock, and their families.
調査の概要
状態
状態
条件
条件
介入・治療
介入・治療
詳細な説明
Study Workflow
Pre-analytical Phase
Participation in the study will be offered to all patients meeting the inclusion and non-inclusion criteria by an investigator from the Department of Genetics, during a medical consultation in which the non-contributive whole-genome sequencing (WGS) result will have been communicated (Figure 1). Information regarding the study procedures and objectives will be provided at that time. The information sheet and consent form will be given to the patient (if an adult) or to the holders of parental authority (if the patient is a minor). After obtaining consent for both the genetic investigations and participation in the research project, the patient may be enrolled in the study. Blood samples required for the study will be collected, transferred to the laboratory, and secured for analysis according to the following protocol:
Patient > 20 kg:
2 × 5 mL EDTA blood tubes
-
× 5 mL heparinized blood tube
Patient 12-20 kg:
-
× 5 mL EDTA blood tubes
Patient 5-12 kg:
1 × 5 mL EDTA blood tube
Samples will be sent to the Cytogenetics Department, where they will be pseudonymized and secured. At least three aliquots of 1.5 mL EDTA blood and the remaining volume will be frozen at -80 °C for DNA extraction and long-fragment DNA extraction. A cell culture (peripheral blood lymphocytes) will also be performed to obtain a fixed chromosomal pellet from the heparinized tube, when available. If the heparinized sample is not available and the results of optical genome mapping require confirmation of a chromosomal abnormality by karyotype or FISH (i.e., contributive result), a second blood draw will be proposed during the clinical results-return consultation.
Analysis Frozen samples from the Cytogenetics Department of Clermont-Ferrand University Hospital (one per patient) will be transferred via TSE to the Department of Genetics at Reims University Hospital, designated to perform optical genome mapping while awaiting installation of the Saphyr scanner at Clermont-Ferrand University Hospital (DAN 2025 application).
Extraction, labeling, and imaging of long DNA molecules will be performed using the manufacturer's kits, following the provided instructions.
Results and Interpretation
Raw data will be analyzed and validated by cytogeneticists at Reims University Hospital using Bionano Access and Solve® software. Data will also be securely shared with the project lead, responsible for:
Performing a second independent analysis (with Bionano Access and Solve, available in the Cytogenetics Department), leveraging expertise acquired through participation in previous projects.
Providing final interpretation of results and disseminating clinically relevant findings for patient management.
Each sample will therefore benefit from dual review and dual expertise, ensuring the reliability of the results.
Parental segregation studies may be proposed to facilitate biological interpretation. If needed, collection of parental samples and consent procedures will be coordinated by the Department of Medical Genetics at Clermont-Ferrand University Hospital. Conclusive results will be communicated to the clinician who prescribed the WGS for patient management and genetic counselling.
研究の種類
研究の種類
入学 (推定)
入学
段階
段階
- 適用できない
連絡先と場所
研究連絡先
研究連絡先
- 名前:Lise Laclautre
- 電話番号:+33473754963
- メール:promo_interne_drci@chu-clermontferrand.fr
研究場所
-
-
-
Clermont-Ferrand、フランス
- 募集
- CHU clermont-Ferrand
-
コンタクト:
- Lise Laclautre
- 電話番号:+33473754963
- メール:promo_interne_drci@chu-clermontferrand.fr
-
主任研究者:
- Céline PEBREL-RICHARD
-
-
参加基準
適格基準
適格基準
就学可能な年齢
- 子
- 大人
- 高齢者
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria
- Patients presenting with at least two congenital anomalies, with or without intellectual disability, and weighing more than 5 kg.
- Whole-genome sequencing performed by the AURAGEN laboratory deemed non-contributive (absence of class 4 or 5 variants, or identification of a VUS, or identification of only one variant in the context of a recessive disorder).
- Patient covered by a social security scheme.
- Patient able to understand and to oppose participation in the study.
- Written informed consent for genetic analyses, signed either by the patient or by their legal representatives (for minors), after clear and fair information about the study has been provided.
Non-Inclusion Criteria
- Patients for whom a non-genetic cause (infectious, environmental, or toxic) has been previously identified.
- Inability to obtain a compliant sample.
- Patient or holder of parental authority under guardianship or legal protection, deprived of liberty, or placed under court-ordered protection.
研究計画
研究はどのように設計されていますか?
デザインの詳細
- 主な目的:診断
- 割り当て:なし
- 介入モデル:単一グループの割り当て
- マスキング:なし(オープンラベル)
アーム数
武器と介入
参加者グループ / アーム参加者グループ / アーム |
介入・治療介入・治療 |
|---|---|
|
実験的:先天奇形を有する患者の単一アーム
|
A blood sample will be collected after obtaining consent from the patient and/or their legal guardians. The number of tubes required (1 to 3) will be determined according to the patient's weight, for the purpose of performing optical genome mapping and any necessary confirmatory analyses in the event that a structural variant is identified. |
この研究は何を測定していますか?
主要な結果の測定
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
diagnostic yield of optical genome mapping (OGM) in multiple congenital anomalies with or without intellectual disability when whole-genome sequencing (WGS) is non-contributive
時間枠:day 1 (inclusion and blood collection)
|
Assessing the diagnostic yield of optical genome mapping (OGM) in multiple congenital anomalies with or without intellectual disability when whole-genome sequencing (WGS) is non-contributive (absence of causal genetic variation or detection of a variant of uncertain significance (VUS) or a single variant in a recessive disorder). |
day 1 (inclusion and blood collection)
|
二次結果の測定
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
新規候補遺伝子/病原性メカニズムが特定された患者数
時間枠:第1日目(組み入れおよび採血)
|
第1日目(組み入れおよび採血)
|
|
|
Number of reclassified variants intially considered as VUS (Variants of Uncertain/Unknown Signification)
時間枠:day 1 (inclusion and blood collection)
|
Assessment of the number of variants initially classified as VUS (variants of uncertain/unknown significance) that were reclassified as benign or pathogenic variants |
day 1 (inclusion and blood collection)
|
|
Evaluation of the feasibility (duration) of the technique in current practice in 1st-line, 2nd-line (after routine tests such as chromosomal microarray, exome sequencing…), or 3rd-line in the case of non-contributive WGS based on several criteria
時間枠:day 1 (inclusion and blood collection)
|
Evaluation of technical duration (hours) |
day 1 (inclusion and blood collection)
|
|
Evaluation of the feasibility of the technique (failure) in current practice in 1st-line, 2nd-line (after routine tests such as chromosomal microarray, exome sequencing…), or 3rd-line in the case of non-contributive WGS based on several criteria
時間枠:day 1 (inclusion and blood collection)
|
failure rate number |
day 1 (inclusion and blood collection)
|
|
Evaluation of the feasibility of the technique (reprocessing) in current practice in 1st-line, 2nd-line (after routine tests such as chromosomal microarray, exome sequencing…), or 3rd-line in the case of non-contributive WGS based on several criteria
時間枠:day 1 (inclusion and blood collection)
|
reprocessing rate number |
day 1 (inclusion and blood collection)
|
|
Evaluation of the feasibility of the technique (interpretation) in current practice in 1st-line, 2nd-line (after routine tests such as chromosomal microarray, exome sequencing…), or 3rd-line in the case of non-contributive WGS based on several criteria
時間枠:day 1 (inclusion and blood collection)
|
Evaluation of biological interpretation time (hours) |
day 1 (inclusion and blood collection)
|
|
Assess the impact of using these new technologies on patient management.
時間枠:day 1 (inclusion and blood collection)
|
Percentage of patients for whom the OGM results led to a change in clinical management. |
day 1 (inclusion and blood collection)
|
協力者と研究者
捜査官
捜査官
- スタディチェア:Lise LACLAUTRE、University Hospital, Clermont-Ferrand
研究記録日
主要日程の研究
研究開始 (実際)
研究開始
一次修了 (推定)
一次修了
研究の完了 (推定)
研究の完了
試験登録日
最初に提出
最初に提出
QC基準を満たした最初の提出物
QC基準を満たした最初の提出物
最初の投稿 (実際)
最初の投稿
学習記録の更新
投稿された最後の更新 (実際)
投稿された最後の更新
QC基準を満たした最後の更新が送信されました
QC基準を満たした最後の更新が送信されました
最終確認日
最終確認日
詳しくは
本研究に関する用語
その他の研究ID番号
その他の研究ID番号
- AOI 2024 PEBREL-RICHARD
個々の参加者データ (IPD) の計画
個々の参加者データ (IPD) を共有する予定はありますか?
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