Hennekam Lymphangiectasia-Lymphedema Syndrome

Alternative Names

  • Hennekam Syndrome
  • Lymphatic Dysplasia, Generalized
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WHO-ICD-10 version:2010

Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism

OMIM Number

235510

Mode of Inheritance

Autosomal recessive

Gene Map Locus

18q21.32

Description

Hennekam syndrome is an autosomal recessive syndrome with lymphangiectasia, severe peripheral lymphedema, facial anomalies, seizures, mild growth retardation and variable mental retardation. Defective vascular and lymphatic development and consequent alteration in the fluid dynamics appear to disrupt critical events in craniofacial morphogenesis resulting in this phenotype.

Differential diagnosis of Hennekam syndrome include other rare syndromes associated with congenital lymphedema as: Noonan syndrome or Turner-like syndrome, Cholestasis lymphedema syndrome (CLS) or Aagenaes syndrome, Primary intestinal lymphangiectasia or Waldmann's disease, and hereditary lymphedema syndrome. Treatment of Hennekam syndrome includes medical and surgical procedures to control protein loss entropathy and lymphedema.

Molecular Genetics

Several genes known to be involved in lymphangiogenesis have been excluded in Hennekam syndrome using linkage analysis. Recent studies have confirmed that mutations in the Collagen and Calcium Binding EGF Domain-Containing Protein 1 (CCBE1) gene are associated with Hennekam lymphangiectasia-lymphedema syndrome. The CCBE1 gene codes for a protein that is supposed to be involved in extracellular matrix remodeling and migration. The gene is expressed primarily in the ovaries. It is also speculated to be a tumor suppressor gene due to the observation of down-regulation of the gene in ovarian cancer cell lines. Similarly, breast cancer cell lines show a high frequency of down-regulation of CCBE1, suggesting that loss of CCBE1 function results in changes in cell adhesion and mobility.

Epidemiology in the Arab World

View Map
Subject IDCountrySexFamily HistoryParental ConsanguinityHPO TermsVariantZygosityMode of InheritanceReferenceRemarks
235510.1IraqFemaleYes Global developmental delay; Growth del...NM_133459.4:c.979G>CHomozygousAutosomal, RecessiveAlders et al. 2009
235510.2OmanMaleYes Global developmental delay; Growth d...NM_133459.4:c.305G>CHomozygousAutosomal, RecessiveAl-Gazali et al. 2003; Alders et al. 2009
235510.3OmanMaleNoYes Global developmental delay; Abnormal fac...NM_133459.4:c.223T>AHomozygousAutosomal, RecessiveAlders et al. 2013

Other Reports

Tunisia

Al-Gazali et al. (2003) reported a female child born to Tunisian second cousins. She had several dysmorphic features at birth including bossing of the forehead, a depressed nasal bridge, small dysmorphic ears and edema of the dorsum of hands and feet. At three months of age she presented with a wide anterior fontanel, a prominent forehead with an open metopic suture, widely spaced eyes, a very flat and depressed nasal bridge, thin tented lips, small dysmorphic ears and preauricular skin tags. She was treated for diarrhea in the first two months of life and also had persistent vomiting. At her first year of age, she was hypotonic with delayed milestones and had a bilateral severe conductive hearing loss.

United Arab Emirates

Al Gazali et al. (2003) described several Arab children with Hennekam syndrome. One of these was a male child of first cousin parents from the United Arab Emirates. At birth he was noted to have puffy face with marked edema of the hands, lower legs, and dorsum of the feet, more on the left side than the right side. At two months of age, he was admitted to hospital because of abdominal swelling. Since that time, he underwent repeated hospitalizations for shortness of breath and prolonged expiration on auscultation. At nine years, he presented a prominent occiput, widely spaced eyes, epicanthic folds, a flat face with a depressed nasal bridge and a short nose, poor dental hygiene and a high, arched palate.

Alders et al. (2013) studied CCBE1 gene mutations in a cohort of patients with lymphadema. An Emirati male patient without a mutation in CCBE1 but in whom the diagnosis HS was considered to be likely, was included in this report. 

Yemen

Alders et al. (2013) studied CCBE1 gene mutations in a cohort of patients with lymphadema. A Yemeni female patient without a mutation in CCBE1 but in whom the diagnosis HS was considered to be likely, was included in this report. 

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