Meyahealth
HomeGeneticsConditionHartsfield syndrome
Back to Condition
Hartsfield syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Hartsfield syndrome

Hartsfield syndrome is a rare genetic disorder defined by the combination of holoprosencephaly (abnormal brain development) and ectrodactyly (malformation of the hands and feet).

Overview

Hartsfield syndrome is characterized by holoprosencephaly, where the brain fails to divide properly into two halves during early development. This can range from severe cases, where the brain does not divide at all, to milder forms where division is partial. The condition also features ectrodactyly, a deep split in the hands or feet with missing or fused digits.

Symptoms

  • Brain and Pituitary Dysfunction: Malfunctioning of the pituitary gland can lead to diabetes insipidus, growth hormone deficiency, and hypogonadotropic hypogonadism. Other brain-related issues include seizures, feeding difficulties, and problems regulating sleep or body temperature.
  • Developmental Delay: Affected individuals experience delayed development ranging from mild to severe.
  • Physical Malformations: Features may include premature fusion of skull bones (craniosynostosis), heart defects, vertebral abnormalities, and abnormal genitalia.
  • Facial Features: Some individuals have widely or closely spaced eyes, small or abnormally shaped ears, and a split in the lip (cleft lip) or the roof of the mouth (cleft palate).

Causes

The syndrome is caused by mutations in the FGFR1 gene, which provides instructions for the fibroblast growth factor receptor 1 protein. This receptor is critical for cell signaling involved in the development of the brain, craniofacial bones, and the bones of the hands and feet. Mutations severely disrupt the receptor's ability to bind to growth factors, impairing normal development.

Inheritance

Hartsfield syndrome can follow an autosomal dominant or autosomal recessive pattern of inheritance. In dominant cases, the condition often results from a new mutation (de novo) or germline mosaicism, where a parent carries the mutation only in their reproductive cells.

Frequently Asked Questions

Because the condition features holoprosencephaly and pituitary malformations, newborns are at high risk for central diabetes insipidus, secondary adrenal insufficiency, and severe temperature dysregulation. Caregivers and clinicians must monitor closely for signs of severe dehydration, extreme swings in urine output, hypernatremia, and hypoglycemia. Comprehensive baseline endocrinologic testing is critical immediately after birth so that life-saving hormone replacements, such as hydrocortisone or desmopressin, can be initiated without delay.
Management of split-hand and split-foot malformations focuses primarily on optimizing grasp, pinch, and weight-bearing function rather than purely cosmetic correction. Early evaluation by a pediatric orthopedic hand and foot surgeon is essential. Depending on the configuration of missing or fused digits, reconstructive procedures such as soft-tissue release, digit separation, or cleft closure may be performed during toddlerhood, supported by specialized occupational and physical therapy.
Hartsfield syndrome is caused by mutations in the FGFR1 gene and can follow either an autosomal dominant or an autosomal recessive pattern. Most autosomal dominant cases arise as a new (de novo) mutation with no prior family history, carrying a low recurrence risk for future pregnancies. However, parental germline mosaicism or recessive inheritance can elevate the risk up to 25 percent. Genetic counseling and parental carrier testing are strongly advised to assess individual recurrence risk.
The improper midline cleavage of the forebrain directly affects hypothalamic development, which controls the autonomic regulation of core body temperature. Consequently, minor changes in room temperature or mild viral infections can provoke dramatic hypothermia or hyperthermia. Structural cortical abnormalities also significantly lower the seizure threshold, requiring proactive neurological evaluation, baseline electroencephalograms, and careful antiepileptic drug management.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

Meyahealth

Ⓒ 2026. All rights reserved by MEYA

About UsTerms & PolicyFAQ