Börjeson-Forssman-Lehman Syndrome

Börjeson-Forssman-Lehman Syndrome

National Organization for Rare Disorders, Inc.

Important

It is possible that the main title of the report Börjeson-Forssman-Lehman Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.

Synonyms

  • BORJ
  • BFLS
  • Borjeson syndrome

Disorder Subdivisions

  • None

General Discussion

Börjeson-Forssman-Lehmann syndrome (BFLS) is an extremely rare disorder characterized by intellectual disability, obesity, seizures, failure of the testes in males or the ovaries in females to produce hormones (hypogonadism), and distinctive facial features. Affected infants often experience delays in reaching developmental milestones. The exact symptoms vary from case to case, even among members of the same family.



BFLS is caused by disruptions or changes (mutations) of the PHF6 gene on the X chromosome. This mutation is usually transmitted as an X-linked recessive trait, which means the disorder is fully expressed predominantly in males. Females who carry a single copy of the disease gene (heterozygous carriers) may develop some variable features of the disorder, however, in some instances they can have features similar to the affected males (i.e. be considered as affected with the syndrome).

Symptoms

Börjeson-Forssman-Lehmann syndrome is usually fully expressed in males only, but there is at least one report of an effected female with the syndrome. Generally symptoms in females are less severe and more variable, but this cannot be predicted based on molecular studies. The symptoms associated with BFLS are variable even in males and even in individuals of the same family.



Most male cases of BFLS are characterized by mental retardation of varying severity. Affected infants may also have diminished muscle tone (hypotonia), a condition that indicates that the head circumference is smaller than would be expected for an infant's age and sex (microcephaly), and may experience feeding difficulties resulting in failure to thrive. As affected children age they may experience delays in reaching developmental milestones. Seizures may be present in some cases. Mild obesity is common in affected children even during infancy.



Affected individuals may have distinctive facial features including large, fleshy earlobes, deep-set eyes, heavy ridges above the eyes (prominent supraorbital ridge), and thickened connective tissue of the face, giving the face a coarse appearance. In some cases, affected individuals may have droopy upper eyelids (ptosis), rapid, involuntary eye movements (nystagmus), and abnormalities of the thin membrane that lines the back of the eyes (retina) and the main nerve that sends electrical impulses from the retina to the brain (optic nerve). Vision problems such as farsightedness (hyperopia) and cataracts may develop before the age of 30.



Individuals with BFLS may also have reduced function of the testes or ovaries (hypogonadism). The failure of the testes and ovaries to produces hormones may result in growth deficiencies resulting in short stature and delayed sexual development. In addition, affected males may have small genitalia and the testes may fail to descend into the scrotum (cryptorchidism). After puberty, some males may develop abnormally enlarged breasts (gynecomastia).



Skeletal abnormalities may occur in some cases including abnormal side-to-side or front-to-back curvature of the spine (scoliosis or kyphosis), a narrow cervical spinal canal, or underdevelopment (hypoplasia) of certain bones of the fingers or toes resulting long, tapered fingers and abnormally short toes especially the fourth and fifth toes.



As affected males age, the symptoms of the disorder may become milder and vary more between cases. Diabetes has occurred in some adults with BFLS.



Females who carry the disease gene for BFLS may develop some symptoms of the disorder. Females usually develop a milder form of BFLS than males and the specific symptoms are highly variable. For example, intelligence may be unaffected or intellectual disability may occur. Additional symptoms may include large ears, obesity, coarse facial appearance, and a variety of skeletal abnormalities. Some affected females may experience delayed development of secondary sexual characteristics. At least one female was reported so far in the medical literature with full features of the syndrome, similar to those of an affected male.

Causes

Börjeson-Forssman-Lehmann syndrome is caused by a mutation of the zinc finger protein 6 (PHF6) gene. This mutation is inherited as an X-linked recessive trait. The gene PHF6 contains instructions (encodes) for creating a specific type of protein. One of the functions of this protein is to prevent cancer, but the other functions are unknown.



Mutations in the PHF6 gene have been found in the cancer cells of people who have T-cell acute lymphoblastic leukaemia (T-ALL) or acute myelogenous leukemia (AML). These people do not have the BFLS syndrome. The mutations of PHF6 are found only in some cells in their blood. There has been at least one report of a male affected with both, BFLS and T-ALL. These cancers are thought to have occurred due to the role of PHF6 as a tumor suppressor gene, in other words a gene that prevents the development of cancer. It is obvious that PHF6 on its own is unlikely cause cancer, however, together with mutations in others genes it can contribute to cancer. While there might be a slightly increased risk of these forms of blood cancer to occur in people affected with BFLS (i.e. with germline PHF6 mutations), such risk is at the moment difficult to quantify. More studies are required to address the importance of the PHF6-cancer link for the BFLS patients.



X-linked genetic disorders are conditions caused by an abnormal gene on the X chromosome and manifest mostly in males. Females that have a defective gene present on one of their X chromosomes are carriers for that disorder. Carrier females usually do not display symptoms because females have two X chromosomes and only one carries the defective gene. Males have one X chromosome that is inherited from their mother and if a male inherits an X chromosome that contains a defective gene he will develop the disease.



Female carriers of an X-linked disorder have a 25% chance with each pregnancy to have a carrier daughter like themselves, a 25% chance to have a non-carrier daughter, a 25% chance to have a son affected with the disease and a 25% chance to have an unaffected son.



If a male with an X-linked disorder is able to reproduce, he will pass the defective gene to all of his daughters who will be carriers. A male cannot pass an X-linked gene to his sons because males always pass their Y chromosome instead of their X chromosome to male offspring.

Affected Populations

Börjeson-Forssman-Lehmann syndrome is an extremely rare disorder that is fully expressed in males only. Some females who carry a single copy of the disease gene may develop some symptoms of the disorder. BFLS was originally described in the medical literature in 1962 in three related males as well as three of their more mildly affected female relatives. The exact incidence of BFLS is unknown. Approximately 20 unrelated families and various isolated cases have been reported in the medical literature with mutations in the PHF6 gene.

Standard Therapies

Diagnosis

A diagnosis of Börjeson-Forssman-Lehmann syndrome is made based upon a thorough clinical evaluation, a detailed patient history, and identification of characteristic features. X-rays of the skeletal (skeletal radiography) may be used to detect the presence and assess the severity of potential skeletal defects and support a diagnosis of BFLS.

Molecular genetic testing for mutations in the PHF6 gene is available to confirm the diagnosis.



Treatment

The treatment of BFLS is directed toward the specific symptoms that are apparent in each individual. Treatment may require the coordinated efforts of a team of specialists. Pediatricians, neurologists, eye specialists (ophthalmologists), and specialists in treating skeletal disorders (orthopedists), and other healthcare professionals may need to systematically and comprehensively plan an affected child's treatment.



Early developmental intervention is important in ensuring that affected children with BFLS reach their potential. Special services that may be beneficial to affected children may include special remedial education and other medical, social, and/or vocational services. Genetic counseling may be of benefit for affected individuals and their families.

Investigational Therapies

Information on current clinical trials is posted on the Internet at www.clinicaltrials.gov. All studies receiving U.S. government funding, and some supported by private industry, are posted on this government web site.



For information about clinical trials being conducted at the NIH Clinical Center in Bethesda, MD, contact the NIH Patient Recruitment Office:



Toll free: (800) 411-1222

TTY: (866) 411-1010

Email: prpl@cc.nih.gov



For information about clinical trials sponsored by private sources, contact:

www.centerwatch.com

References

TEXTBOOKS

Gunay-Aygun M. Börjeson-Forssman-Lehmann Syndrome. NORD Guide to Rare Disorders. Philadelphia, PA: Lippincott Williams & Wilkins; 2003:705-6.



Rimoin D, Connor JM, Pyeritz RP, Korf BR. Eds. Emory and Rimoin's Principles and Practice of Medical Genetics. 4th ed. New York, NY: Churchill Livingstone; 2002:2149.



Gorlin RJ, Cohen MMJr, Hennekam RCM. Eds. Syndromes of the Head and Neck. 4th ed. New York, NY: Oxford University Press; 2001:426-7.



Stevenson RE, Schwartz CE, Schroer RJ. X-linked Mental Retardation. New York, NY: Oxford University Press; 2000:134-138.



JOURNAL ARTICLES

Van Vlierberghe P, Patel J, Abdel-Wahab O, et al. PHF6 mutations in adult acute myeloid leukemia. Leukemia. 2011;25(1):130-4.



Berland S, Alme K, Brendehaug A, Houge G, Hovland R. PHF6 Deletions May Cause Börjeson-Forssman-Lehmann Syndrome in Females. Mol Syndromol. 2011;1(6):294-300.



Chao MM, Todd MA, Kontny U, et al. T-cell acute lymphoblastic leukemia in association with Börjeson-Forssman-Lehmann syndrome due to a mutation in PHF6. Pediatr Blood Cancer. 2010;55(4):722-4.



Holmfeldt L, Mullighan CG. PHF6 mutations in T-lineage acute lymphoblastic leukemia. Pediatr Blood Cancer. 2010;55(4):595-6.



Van Vlierberghe P, Palomero T, Khiabanian H, et al. PHF6 mutations in T-cell acute lymphoblastic leukemia. Nat Genet. 2010;42(4):338-42.



Crawford, J, Lower KM, Hennekam RCM, et al. Mutation screening in Börjeson-Forssman-Lehmann syndrome: identification of a novel de novo PHF6 mutation in a female patient. J Med Genet. 2006;43:238-43.



Gecz J, Turner G, Nelson J, Partington M. The Börjeson-Forssman-Lehman syndrome (BFLS, MIM#301900). Europ J Hum Genet. 2006;14:1233-7.



Turner G, Lower KM, White SM, et al. The clinical picture of Börjeson-Forssman-Lehmann syndrome in males and heterozygous females with PHF6 mutations. Clin Genet. 2004;65:226-32.



Vallee D, Chevrier E, Graham GE, et al. A novel PHF6 mutation results in enhanced exon skipping and mild Börjeson-Forssman-Lehmann syndrome. J Med Genet. 2004;41:778-83.



Visootsak J, Rosner B, Dykens E, et al. Clinical and behavioral features of patients with Börjeson-Forssman-Lehmann syndrome with mutations in PHF6. J Pediatr. 2004;145:819-25.



Baumstark A, Lower KM, Sinkus A, et al., Novel PHF6 mutation p.D333del causes Börjeson-Forssman-Lehmann syndrome. J Med Genet. 2003;40:e.50.



Lower KM, Turner G, Kerr BA et al. Mutations in a novel PHD finger gene, PHF6, cause Börjeson-Forssman-Lehmann syndrome Nature Genetics. 2002;32(4):661-5.



Kubota T, Oga S, Ohashi H, Iwamotor Y, Fukushima Y. Börjeson-Forssman-Lehmann syndrome in a women with skewed X-chromosome. Am J Med Genet. 1999;26:258-61.



Gunay-Aygun M, Cassidy SB, Nicholls RD. Prader-Willi and other syndromes associated with obesity and mental retardation. Behav Genet. 1997;27:307-24.



INTERNET

Moraine C. Börjeson-Forssman-Lehmann Syndrome. Orphanet encyclopedia. http://www.orpha.net/consor/cgi-bin/OC_Exp.php?Lng=GB&Expert=127. Last Updated October 2004. Accessed March 30, 2012.



Online Mendelian Inheritance in Man (OMIM). The Johns Hopkins University. Börjeson-Forssman-Lehmann Syndrome; BFLS Entry No: 301900. Last Edited October 26, 2011. Available at: http://www.ncbi.nlm.nih.gov/omim/. Accessed March 30, 2012.

Resources

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