Whole Exome Sequencing and Whole Genome Sequencing for Nonimmune Fetal/Neonatal Hydrops

Genetic Disorders Clinical Trial

Official title:

Whole Exome Sequencing and Whole Genome Sequencing for Nonimmune Fetal/Neonatal Hydrops

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT03911531
• Other study ID #: IRB18D.728
• Status: Recruiting
• Start date: January 15, 2019
• Est. completion date: December 31, 2024

Study information

• Verified date: November 2023
• Source: Thomas Jefferson University
• Contact: Huda B Al-Kouatly, MD
• Phone: 215-955-9200
• Email: Huda.Al-kouatly[@]jefferson.edu
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Brief Summary: Nonimmune hydrops fetalis (NIHF) is a potentially fatal condition characterized by abnormal fluid accumulation in two or more fetal compartments. Numerous etiologies may lead to NIHF, and the underlying cause often remains unclear (1). The current standard of genetic diagnostic testing includes a fetal karyotype and chromosomal microarray (CMA), with an option to pursue single gene testing on amniocytes collected by amniocentesis (2). A large subgroup of the NIHF causes includes single gene disorders that are not diagnosed with the standard genetic workup for hydrops. Currently, nearly 1 in 5 cases of NIHF is defined as idiopathic, meaning there is no identified etiology (2). The investigators believe this is because the causes of NIHF are not completely investigated, specifically single gene disorders. Our research study aims to increase the diagnostic yield by performing whole exome sequencing (WES) and whole genome sequencing (WGS) on prenatal and neonatal NIHF cases when standard genetic testing is negative, identifying known and new genes, thus providing vital information to families regarding the specific diagnosis and risk to future pregnancies. The investigators plan to perform WES as the initial diagnostic test. If WES is negative, then the investigators will proceed to perform WGS.

Description:

This is a prospective cohort study design for fetuses or neonates affected with NIHF. Mother-father-fetus trios of pregnancies complicated by idiopathic non-immune fetal hydrops will be identified. These patients will be counseled by a Maternal-Fetal Medicine specialist as would be the routine. As part of the routine work-up, amniocentesis will be recommended for karyotype, CMA and an infectious work-up. Amniocentesis will be performed by the Maternal-Fetal Medicine specialist of the referring institution. The patient will also be offered genetic counseling (routine). Subjects will be offered enrollment when inclusion criteria are met. After enrollment, the following samples will be collected: (1) maternal blood (2) paternal blood, (3) fetal DNA isolated from amniocytes (4) neonatal blood when referral is done postnatally. The WES results will be reported to the genetic counselor dedicated to the study. The parents will be contacted by the genetic counselor and counseled on the findings whether they were positive or negative. The result will also be communicated to the patient's primary MFM provider or pediatrician and appropriate referrals to pediatric genetics specialists will be made by the primary provider. In cases where no genetic disorder is identified, the sample will be stored and then subsequently whole genome sequencing will be performed.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 55
• Est. completion date: December 31, 2024
• Est. primary completion date: June 30, 2024
• Accepts healthy volunteers: No
• Gender: All
• Age group: 16 Years to 55 Years

Eligibility

The following inclusion criteria will apply:

1. Fetal hydrops identified anytime in pregnancy after the first trimester

2. Parents are planning to proceed with amniocentesis as a routine workup for hydrops.

3. Both parents are available for blood sample collection

4. Normal CMA and normal karyotype if performed

5. Negative workup for Parvovirus B19, cytomegalovirus, toxoplasmosis, and syphilis

6. Negative fetomaternal hemorrhage workup as a cause for hydrops For cases of neonatal hydrops, the criteria for invasive prenatal testing will not be required as a postnatal blood sample from the hydropic infant will be the source of proband DNA.

The following exclusion criteria will apply:

1. Microarray was abnormal or karyotype was abnormal

2. Hydrops caused by congenital infection

3. Fetomaternal hemorrhage was a documented etiology for hydrops

4. Parental DNA cannot be obtained for either parents

5. Donor egg or donor sperm were utilized for conception

6. Fetus/Infant diagnosed with lysosomal storage disease

7. Pregnant woman or father of the baby less than 16 years of age

8. Hydrops was diagnosed concomitantly with intrauterine fetal demise

Related Conditions & MeSH terms

• Edema
• Genetic Diseases, Inborn
• Genetic Disorders
• Hydrops Fetalis

Intervention

Diagnostic Test:
• Whole Exome Sequencing
Whole exome sequencing (WES) provides more detailed information through greater resolution, identifying single base-pair changes and small insertions and deletions. WES performs sequencing on the protein-coding exons, which are contained in 1-2% of the genome but make up over 85% of all known pathogenic mutations.
• Whole Genome Sequencing
Whole Genome Sequencing (WGS) has emerged in recent years as a diagnostic tool that sequences the entire genome and can pick up insertions or deletion of bases, structural variants and intronic single nucleotide variations.

Locations

Country	Name	City	State
United States	Thomas Jefferson University	Philadelphia	Pennsylvania

Sponsors (1)

Lead Sponsor	Collaborator
Thomas Jefferson University

Country where clinical trial is conducted

United States, 

References & Publications (4)

Lionel AC, Costain G, Monfared N, Walker S, Reuter MS, Hosseini SM, Thiruvahindrapuram B, Merico D, Jobling R, Nalpathamkalam T, Pellecchia G, Sung WWL, Wang Z, Bikangaga P, Boelman C, Carter MT, Cordeiro D, Cytrynbaum C, Dell SD, Dhir P, Dowling JJ, Heon E, Hewson S, Hiraki L, Inbar-Feigenberg M, Klatt R, Kronick J, Laxer RM, Licht C, MacDonald H, Mercimek-Andrews S, Mendoza-Londono R, Piscione T, Schneider R, Schulze A, Silverman E, Siriwardena K, Snead OC, Sondheimer N, Sutherland J, Vincent A, Wasserman JD, Weksberg R, Shuman C, Carew C, Szego MJ, Hayeems RZ, Basran R, Stavropoulos DJ, Ray PN, Bowdin S, Meyn MS, Cohn RD, Scherer SW, Marshall CR. Improved diagnostic yield compared with targeted gene sequencing panels suggests a role for whole-genome sequencing as a first-tier genetic test. Genet Med. 2018 Apr;20(4):435-443. doi: 10.1038/gim.2017.119. Epub 2017 Aug 3. — View Citation

Society for Maternal-Fetal Medicine (SMFM); Norton ME, Chauhan SP, Dashe JS. Society for maternal-fetal medicine (SMFM) clinical guideline #7: nonimmune hydrops fetalis. Am J Obstet Gynecol. 2015 Feb;212(2):127-39. doi: 10.1016/j.ajog.2014.12.018. Epub 2014 Dec 31. — View Citation

Taylor JC, Martin HC, Lise S, Broxholme J, Cazier JB, Rimmer A, Kanapin A, Lunter G, Fiddy S, Allan C, Aricescu AR, Attar M, Babbs C, Becq J, Beeson D, Bento C, Bignell P, Blair E, Buckle VJ, Bull K, Cais O, Cario H, Chapel H, Copley RR, Cornall R, Craft J, Dahan K, Davenport EE, Dendrou C, Devuyst O, Fenwick AL, Flint J, Fugger L, Gilbert RD, Goriely A, Green A, Greger IH, Grocock R, Gruszczyk AV, Hastings R, Hatton E, Higgs D, Hill A, Holmes C, Howard M, Hughes L, Humburg P, Johnson D, Karpe F, Kingsbury Z, Kini U, Knight JC, Krohn J, Lamble S, Langman C, Lonie L, Luck J, McCarthy D, McGowan SJ, McMullin MF, Miller KA, Murray L, Nemeth AH, Nesbit MA, Nutt D, Ormondroyd E, Oturai AB, Pagnamenta A, Patel SY, Percy M, Petousi N, Piazza P, Piret SE, Polanco-Echeverry G, Popitsch N, Powrie F, Pugh C, Quek L, Robbins PA, Robson K, Russo A, Sahgal N, van Schouwenburg PA, Schuh A, Silverman E, Simmons A, Sorensen PS, Sweeney E, Taylor J, Thakker RV, Tomlinson I, Trebes A, Twigg SR, Uhlig HH, Vyas P, Vyse T, Wall SA, Watkins H, Whyte MP, Witty L, Wright B, Yau C, Buck D, Humphray S, Ratcliffe PJ, Bell JI, Wilkie AO, Bentley D, Donnelly P, McVean G. Factors influencing success of clinical genome sequencing across a broad spectrum of disorders. Nat Genet. 2015 Jul;47(7):717-726. doi: 10.1038/ng.3304. Epub 2015 May 18. — View Citation

Whybra C, Mengel E, Russo A, Bahlmann F, Kampmann C, Beck M, Eich E, Mildenberger E. Lysosomal storage disorder in non-immunological hydrops fetalis (NIHF): more common than assumed? Report of four cases with transient NIHF and a review of the literature. Orphanet J Rare Dis. 2012 Nov 8;7:86. doi: 10.1186/1750-1172-7-86. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Identify known single gene disorders that would not be detected by microarray as a cause of nonimmune fetal hydrops by performing whole exome sequencing (WES)		5 years
Primary	Identify novel genetic disorders associated with nonimmune hydrops		5 years
Secondary	Evaluate the incremental value of whole genome sequencing (WGS) in the evaluation of fetal hydrops when WES is negative		5 years
Secondary	Better counsel the parents about the etiology of hydrops especially if they desire a subsequent pregnancy		5 years