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Cytochrome P450 oxidoreductase deficiency (PORD)

Cytochrome P450 oxidoreductase deficiency (PORD)



Overview             

Cytochrome P450 oxidoreductase deficiency (PORD) is a rare genetic disorder of hormone production that causes abnormal bone development, atypical genital development, and problems with cortisol. 

Symptoms

Primary amenorrhea: Failure to start menstruation by age 16.Infertility: Affects both men and women

Polycystic ovary syndrome (PCOS): Hormonal imbalance causing irregular periods, ovarian cysts, acne, or excess hair growth.

Hypogonadism: Poor hormone production in males, leading to delayed puberty.

Ambiguous genitalia: External sex organs that do not look clearly male or female in newborns of either genetic sex.

Cortisol deficiency: Partial reduction in the stress hormone cortisol, which can lead to life-threatening adrenal crisis during severe stress or illness.

Maternal virilization: Development of male-pattern secondary sex characteristics in pregnant women carrying an affected fetus.

Hypertension: High blood pressure presenting in young adulthood due to mineralocorticoid excess. 

Craniosynostosis: Premature fusion of the skull bones leading to an abnormal head shape.

Facial differences: Flattened mid-face, prominent forehead, and low-set or dysplastic ears.

Joint and limb abnormalities: Bending of long bones, joint contractures (stiffness limiting movement), radiohumeral synostosis (fused elbows), and long, slender fingers (arachnodactyly).Developmental delays: Potential cognitive reduction or breathing difficulties stemming from airway malformations

Causes

The POR Gene: This gene gives instructions to make an enzyme called cytochrome P450 oxidoreductase.

Electron Transfer: This enzyme acts like an electrical cord. It moves energy (electrons) to other important enzymes in the body.

Gene Mutations: When the POR gene changes or mutates, the enzyme stops working well.Autosomal Recessive: A child must inherit one changed POR gene from each parent to develop the condition

Diagnosis

Steroid profiles: Blood and urine tests show abnormal levels of steroid hormones. PORD causes partial failure in two key enzymes 

High 17-OH progesterone: Blood tests often show elevated levels of 17-hydroxyprogesterone, similar to standard congenital adrenal hyperplasia.

ACTH stimulation test: Giving a hormone called ACTH shows that the adrenal glands produce normal baseline cortisol, but fail to boost cortisol production during stress

Genital appearance: Doctors check for differences in external sex organs. Both male and female babies can be born with ambiguous (unclear) genitalia. 

Skeletal checks: Severe cases feature bone changes known as Antley-Bixler syndrome. This includes fused skull bones (craniosynostosis), a flat mid-face, and bowed long bones in the legs. 

Maternal history: Doctors ask if the mother showed signs of virilization (developing male-like traits such as a deepened voice or extra hair) during pregnancy.

POR gene sequencing: The definitive diagnosis comes from molecular genetic testing. A blood test sequences the POR gene to find disease-causing mutations. 

Differential testing: Genetic tests may also check other genes 

Treatment

Glucocorticoid Replacement: Oral hydrocortisone (typically 15 to 25 mg/day in divided doses) is the main treatment to manage cortisol deficiency and prevent adrenal crisis, with stress-dose coverage required during illness or surgery. 

Pubertal Hormone Replacement: Gender-appropriate hormone therapy using androgens or estrogens with progestins is provided during puberty to induce secondary sexual characteristics. Low-dose corticosteroids combined with estrogen-progesterone therapy can also help manage recurrent ovarian macro-cysts in females. 

Fertility Support: Controlled hormone management can facilitate successful pregnancies, sometimes aided by in vitro fertilization (IVF) and frozen embryo transfer

Genital Reconstruction: Surgical correction may be performed for ambiguous genitalia, hypospadias, or cryptorchidism in males, or clitoromegaly and vaginal hypoplasia in females. 

Skeletal and Airway Management: Surgery is utilized as needed for structural anomalies like craniosynostosis, alongside respiratory aids (such as nasal stents or tracheostomy) for upper airway obstruction.

Therapies: Physical and occupational support help address joint contractures and motor skill development. 

Type of Doctor Department : A pediatric endocrinologist or an adult endocrinologist


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