Introduction

Fraser syndrome, a rare autosomal recessive genetic condition, is characterised by a range of congenital anomalies primarily affecting the eyes, genitourinary system, respiratory tract, and limbs. Genes such as FRAS1, FREM2, and GRIP1 are linked to the condition initially reported by George Fraser in 1962. These genes are essential for the development of epithelial-mesenchymal interactions during embryogenesis. The degree and combination of defects present determine the individual's prognosis and life expectancy in cases with Fraser syndrome.¹

Clinical features and challenges in Fraser syndrome

Major and minor clinical criteria are usually used to diagnose Fraser syndrome. The main requirements include renal agenesis or dysplasia, aberrant genitalia, syndactyly (fusion of digits), and cryptophthalmos (total or partial lack of eyelids). Anomalies include ear deformities, skeletal abnormalities, and a family history of affected siblings are examples of minor requirements. 

The signs of the illness can vary greatly in severity, which has a substantial impact on life expectancy and prognosis. Renal agenesis, pulmonary hypoplasia, and laryngeal stenosis are the most serious and potentially fatal traits; these conditions are frequently linked to unfavourable outcomes.²

Prognosis of Fraser syndrome

The degree of congenital defects and the existence of potentially fatal consequences are directly related to the prognosis of people with Fraser syndrome. The overall prognosis is influenced by multiple factors:

Renal anomalies/agenesis or dysplasia of the renal

A severe disorder known as bilateral renal agenesis (absence of both kidneys) produces oligohydramnios (low amounts of amniotic fluid) during pregnancy, which in turn results in pulmonary hypoplasia (underdevelopment of the lungs). Soon after birth, this combination frequently results in death. Although there may be a better chance for babies born with unilateral renal agenesis or dysplasia, they nonetheless run the risk of having chronic kidney disease in the future.³

Respiratory insufficiency/pulmonary hypoplasia

In cases of Fraser syndrome, pulmonary hypoplasia—which is frequently a result of oligohydramnios—contributes significantly to neonatal mortality. Severe pulmonary hypoplasia newborns usually have respiratory insufficiency and need respiratory support and careful care. In most circumstances, there is not much hope for these patients; many affected infants do not make it through the newborn stage. 

Cryptophthalmos and other anomalies

Cryptophthalmos, a condition in which the eyelids do not form normally, causes blindness or vision impairment to varied degrees. Although not fatal, it can have a significant negative impact on quality of life and necessitates surgery for both practical and cosmetic reasons. 

Skeletal and Genitourinary abnormalities can greatly affect the quality of life and may need to be surgically corrected, although they usually have no direct effect on life expectancy unless they are combined with other severe defects. 

Anomalies of the larynx and respiratory system/anomalies of the larynx or stenosis

These illnesses are frequently fatal and can cause serious breathing problems. Depending on the severity of the defect, early discovery and surgical intervention may or may not be successful.⁴

Life expectancy in Fraser syndrome

Fraser syndrome patients have a wide range of life expectancies, which are mostly influenced by the existence and severity of life-threatening abnormalities. The main elements impacting life expectancy are summed up as follows: 

Neonatal mortality

Fraser syndrome is associated with a high neonatal death rate, which is mostly caused by severe renal, pulmonary, and laryngeal defects. Often, infants with severe pulmonary hypoplasia and bilateral renal agenesis do not make it past the neonatal stage. Survival chances are much better when these anomalies are missing or less severe. 

Eternal viability

A child's prognosis is generally better if they survive the neonatal stage, particularly if they have manageable defects such as unilateral renal agenesis or less severe pulmonary problems. They might still have to deal with long-term health issues like respiratory problems, renal insufficiency, and the requirement for numerous surgeries. 

Quality of life

The quality of life among people with Fraser syndrome varies considerably. If given the right medical and surgical attention, people with lesser variants of the condition can enjoy comparatively normal lives. On the other hand, people with more severe types could have substantial developmental and physical limitations that affect their everyday activities and general quality of life.⁵

Management and support

Improvements in surgical methods, supportive therapies, and neonatal critical care have increased the survival and quality of life for people with Fraser syndrome. The complicated demands of these patients require multidisciplinary care from paediatricians, nephrologists, ophthalmologists, and surgeons. 

Summary

Prognosis and life expectancy are greatly affected by Fraser syndrome, a complicated and heterogeneous condition with a wide range of clinical presentations. Even while severe renal and pulmonary defects have a high infant mortality rate, individuals with less severe variants of the condition may survive for a long time. The degree of physical and developmental issues survivors encounter determines their quality of life. Fraser syndrome patients' fates are greatly improved by ongoing medical developments and early intervention, underscoring the significance of early diagnosis and a multidisciplinary approach to therapy.