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Journal of Fetal Medicine

, Volume 6, Issue 3, pp 151–154 | Cite as

Exome Sequencing Identifies RET Associated Hirschsprung Disease in a Fetus with Echogenic Bowel

  • Gayatri Nerakh
  • Ashwani Tandon
  • Ashwin Dalal
  • Shagun AggarwalEmail author
Brief Communication
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Abstract

This is report of a case of RET associated Hirschsprung disease in a fetus diagnosed using exome sequencing. The fetus initially presented with echogenic bowel at 16 weeks with maternal first trimester serum screen showing increased risk for Trisomy 21. Amniotic fluid karyotype, ΔF508 CFTR genotype and maternal TORCH serology were normal. Subsequent ultrasonograms showed dilated bowel loops, predominantly large bowel. Following delivery at 24 weeks, a post-mortem examination was performed. Dilated bowel was confirmed with no structural gut abnormality and no other dysmorphic finding. Histopathology revealed agangliosis confirming a diagnosis of Hirschsprung disease. Exome sequencing done on fetal DNA from amniotic fluid revealed a putative pathogenic heterozygous c.1438G > A variant in exon 7 of RET gene, which was inherited from the asymptomatic mother. This enabled genetic counseling and prenatal diagnosis in subsequent pregnancy.

Keywords

Exome sequencing RET Hirschsprung disease Fetal autopsy Prenatal diagnosis 

Notes

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interests.

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Copyright information

© Society of Fetal Medicine 2019

Authors and Affiliations

  • Gayatri Nerakh
    • 1
    • 2
  • Ashwani Tandon
    • 3
  • Ashwin Dalal
    • 2
  • Shagun Aggarwal
    • 1
    • 2
    Email author
  1. 1.Department of Medical GeneticsNizam’s Institute of Medical SciencesHyderabadIndia
  2. 2.Diagnostics DivisionCentre for DNA Fingerprinting and DiagnosticsHyderabadIndia
  3. 3.Department of PathologyNizam’s Institute of Medical SciencesHyderabadIndia

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