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Updated: Dec 28, 2025
FISH for Pre-implantation Genetic Diagnosis
Published on: February 23, 2011
Genetic counseling for fetal gastrointestinal anomalies
Erica Schindewolf1, Julie S Moldenhauer1,2
1Center for Fetal Diagnosis and Treatment, The Children's Hospital of Philadelphia.
Insights
Genetic testing advances offer insights into congenital gastrointestinal anomalies. Updated prenatal genetic counseling and testing guidelines are crucial for diagnosing and managing these conditions, improving lifelong care for affected children.
Area of Science:
- Pediatric Surgery
- Medical Genetics
- Prenatal Diagnosis
Background:
- Congenital gastrointestinal anomalies are common but their genetic underpinnings and impact on lifelong care are not fully understood.
- Established treatments exist, yet genetic causes and their implications require further elucidation.
- Recent advancements in genetic testing have not been matched by updated prenatal genetic counseling and testing guidelines.
Purpose of the Study:
- To review current understanding of genetic causes for congenital gastrointestinal anomalies.
- To highlight the importance of updated prenatal genetic counseling and testing.
- To guide families in managing lifelong care for affected children.
Main Methods:
- Review of recent findings on genetic associations with foregut, midgut, and hindgut anomalies.
- Discussion of diagnostic utility of cytogenetic testing (e.g., microarray) and next-generation sequencing panels.
- Emphasis on prenatal diagnostic genetic testing options like amniocentesis and chorionic villus sampling.
Main Results:
- Foregut anomalies (e.g., tracheoesophageal fistula) show high genetic association.
- Duodenal atresia is linked to Trisomy 21; midgut anomalies (e.g., omphalocele) often require cytogenetic and panel testing.
- Hindgut malformations (e.g., imperforate anus, Hirschsprung's disease) have largely unknown etiologies but are associated with microdeletion and other syndromes.
Conclusions:
- Cytogenetic testing is a valuable first-tier test for identifying causes of congenital gastrointestinal anomalies.
- Next-generation sequencing and defect-specific panels are essential when anomalies affect multiple organ systems.
- Updated guidelines are needed to integrate genetic testing into prenatal counseling for comprehensive management planning.
Purpose Of Review:
Congenital gastrointestinal anomalies are common findings with relatively established methods of treatment. However, the genetic cause of how these defects occur and how that may impact a child's lifelong care is less established. Genetic testing has improved significantly in recent years, yet reviews documenting prenatal genetic counseling and testing guidelines have not been comprehensively updated.
Recent Findings:
Congenital anomalies of the foregut, such as tracheoesophageal fistula carry a high association with genetic disorders, both in isolation and syndromic forms. Duodenal atresia remains highly associated with Trisomy 21 but is not enriched in other genetic conditions. Disorders of the midgut, such as omphalocele often have a genetic cause and may require both cytogenetic and panel testing to obtain a diagnosis. The etiologic basis of hindgut malformations remain largely unknown, though imperforate anus as well as Hirschprung's disease have been associated with many micro deletion syndromes as well as in association with other birth defects as part of larger syndromes.
Summary:
Prenatal diagnostic genetic testing through amniocentesis or chorionic villus sampling can be offered to every patient who wants to learn genetic information about their fetus. Cytogenetic testing, such as microarray is a first tier test to assess cause for these conditions and can provide meaningful answers. When a gastrointestinal anomaly is identified in association with an additionally affected organ system next-generation sequencing and defect-specific genetic testing panels can be necessary to understand cause as well as prognosis to best prepare families for the medical management that lies ahead.
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