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Published in: International Journal of Pediatric Endocrinology 1/2018

Open Access 01-12-2018 | Case report

A novel, homozygous mutation in desert hedgehog (DHH) in a 46, XY patient with dysgenetic testes presenting with primary amenorrhoea: a case report

Authors: Karen M. Rothacker, Katie L. Ayers, Dave Tang, Kiranjit Joshi, Jocelyn A. van den Bergen, Gorjana Robevska, Naeem Samnakay, Lakshmi Nagarajan, Kate Francis, Andrew H. Sinclair, Catherine S. Choong

Published in: International Journal of Pediatric Endocrinology | Issue 1/2018

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Abstract

Background

Desert hedgehog (DHH) mutations have been described in only a limited number of individuals with 46, XY disorders of sex development (DSD) presenting as either partial or complete gonadal dysgenesis. Gonadal tumours and peripheral neuropathy have been associated with DHH mutations. Herein we report a novel, homozygous mutation of DHH identified through a targeted, massively parallel sequencing (MPS) DSD panel, in a patient presenting with partial gonadal dysgenesis. This novel mutation is two amino acids away from a previously described mutation in a patient who presented with complete gonadal dysgenesis. Adding to the complexity of work-up, our patient also expressed gender identity concern.

Case presentation

A 14-year-old, phenotypic female presented with primary amenorrhoea and absent secondary sex characteristics. Investigations revealed elevated gonadotrophins with low oestradiol, testosterone of 0.6 nmol/L and a 46, XY karyotype. Müllerian structures were not seen on pelvic ultrasound or laparoscopically and gonadal biopsies demonstrated dysgenetic testes without neoplasia (partial gonadal dysgenesis). The patient expressed gender identity confusion upon initial notification of investigation findings. Formal psychiatric evaluation excluded gender dysphoria. Genetic analysis was performed using a targeted, MPS DSD panel of 64 diagnostic and 927 research candidate genes. This identified a novel, homozygous mutation in exon 2 of DHH (DHH:NM_021044:exon2:c.G491C:p.R164P). With this finding our patient was screened for the possibility of peripheral neuropathy which was not evident clinically nor on investigation. She was commenced on oestrogen for pubertal induction.

Conclusion

The evaluation of patients with DSD is associated with considerable psychological distress. Targeted MPS enables an affordable and efficient method for diagnosis of 46, XY DSD cases. Identifying a genetic diagnosis may inform clinical management and in this case directed screening for peripheral neuropathy. In addition to the structural location of the mutation other interacting factors may influence phenotypic expression in homozygous DHH mutations.
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Metadata
Title
A novel, homozygous mutation in desert hedgehog (DHH) in a 46, XY patient with dysgenetic testes presenting with primary amenorrhoea: a case report
Authors
Karen M. Rothacker
Katie L. Ayers
Dave Tang
Kiranjit Joshi
Jocelyn A. van den Bergen
Gorjana Robevska
Naeem Samnakay
Lakshmi Nagarajan
Kate Francis
Andrew H. Sinclair
Catherine S. Choong
Publication date
01-12-2018
Publisher
BioMed Central
Published in
International Journal of Pediatric Endocrinology / Issue 1/2018
Electronic ISSN: 1687-9856
DOI
https://doi.org/10.1186/s13633-018-0056-3

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