What is the history of Floating-Harbor syndrome?

Floating-Harbor syndrome was first described in 1973 and 1975 by two separate teams of physicians, taking its name from the hospitals where the index patients were evaluated. Originally recognized as a rare condition characterized by short stature and delayed speech, our understanding has evolved from a purely clinical observation to a defined genetic disorder caused by mutations in the SRCAP gene.

When and how was Floating-Harbor syndrome first identified?

The clinical history of Floating-Harbor syndrome began in the 1970s. It was named after the Floating Hospital in Boston, where the first patient was identified by Dr. Pelletier in 1973, and the Harbor General Hospital in Torrance, California, where a second patient was studied by Dr. Robinson in 1975. Initially, researchers were struck by the combination of proportionate short stature, skeletal abnormalities, and distinct craniofacial features, such as a triangular face and deep-set eyes. For decades, it remained a "clinical diagnosis," meaning doctors identified it solely by observing physical traits and developmental delays.

How has our understanding of Floating-Harbor syndrome evolved?

For many years, Floating-Harbor syndrome was considered a collection of symptoms without a known cause. The most significant milestone in its history occurred in 2012, when researchers identified that heterozygous mutations in the SRCAP (Snf2-related CREBBP activator protein) gene were the underlying cause. This discovery transformed the diagnostic process from a subjective clinical assessment to an objective molecular test. Today, we understand that Floating-Harbor syndrome is typically caused by de novo (new) mutations, meaning it is rarely inherited from parents, providing critical clarity for families planning future pregnancies.

What were the historical misconceptions about the condition?

Before the genetic basis of Floating-Harbor syndrome was discovered, patients were often misdiagnosed with other growth-related disorders or generalized developmental delays. Because the syndrome is extremely rare, physicians often struggled to differentiate it from other ciliopathies or skeletal dysplasias. The correction of these misconceptions came through the compilation of international case studies, which allowed medical experts to refine the "phenotypic profile"—a specific checklist of features that now helps clinicians distinguish Floating-Harbor syndrome from more common genetic conditions.

How has patient advocacy shaped the awareness of this syndrome?

The evolution of advocacy has been pivotal. In the early years, families felt isolated due to the scarcity of medical literature. Today, digital platforms like DiseaseMaps.org help bridge this gap. Currently, 11 people with Floating-Harbor syndrome have joined the DiseaseMaps community to share their experiences. This collective knowledge has helped move the focus beyond just clinical metrics toward quality-of-life improvements, such as speech therapy and educational support, which are now recognized as essential components of care.

• 1973: First clinical description of the condition at the Floating Hospital.


• 1975: Additional cases documented at Harbor General Hospital, leading to the combined name.


• 2012: Identification of the SRCAP gene mutation as the definitive cause.


• Modern Era: Shift toward personalized care plans involving endocrinology, speech pathology, and genetic counseling.

Next steps

• Consult a clinical geneticist to discuss molecular testing if you suspect a diagnosis of Floating-Harbor syndrome.


• Connect with the 11 community members on DiseaseMaps.org to share resources and coping strategies.


• Work with a multidisciplinary team, including speech therapists and pediatric endocrinologists, to address specific developmental and growth needs.


• Monitor the NIH GARD website for updates on ongoing clinical research and international support networks.

Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of a qualified healthcare provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Floating-Harbor syndrome overview.


• OMIM (Online Mendelian Inheritance in Man): Entry #136140 (SRCAP gene).


• Orphanet: Rare disease database entry for Floating-Harbor syndrome (ORPHA:2038).


• PubMed: Hood, R. L., et al. (2012). "Mutations in the SRCAP gene cause Floating-Harbor syndrome."