National Center for Advancing and Translational Sciences Genetic and Rare Diseases Information Center, a program of the National Center for Advancing and Translational Sciences

Lujan syndrome



Other Names:
Marfanoid habitus, mild general hypotonia, hypernasal voice, normal testicular size and distinct craniofacial anomalies
Categories:

Lujan syndrome is a condition characterized by intellectual disability, behavioral problems, and poor muscle tone (hypotonia). Affected people also tend to have characteristic physical features such as a tall and thin body; a large head (macrocephaly); and a thin face with distinctive facial features (prominent top of the nose, short space between the nose and the upper lip, narrow roof of the mouth, crowded teeth and a small chin). Most of the cases occur in males. Lujan syndrome is caused by changes (mutations) in the MED12 gene and is inherited in an X-linked manner. Treatment is based on the signs and symptoms present in each person and may include special education; physical therapy, occupational therapy, and speech therapy for developmental delays; and medications to control seizures.[1][2]
Last updated: 11/10/2015

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

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Medical Terms Other Names
Learn More:
HPO ID
80%-99% of people have these symptoms
Disproportionate tall stature 0001519
High forehead 0000348
High palate
Elevated palate
Increased palatal height
[ more ]
0000218
Intellectual disability
Mental deficiency
Mental retardation
Mental retardation, nonspecific
Mental-retardation
[ more ]
0001249
Macrocephaly
Increased size of skull
Large head
Large head circumference
[ more ]
0000256
Micrognathia
Little lower jaw
Small jaw
Small lower jaw
[ more ]
0000347
Muscular hypotonia
Low or weak muscle tone
0001252
Nasal speech
Nasal voice
0001611
Neurological speech impairment
Speech disorder
Speech impairment
Speech impediment
[ more ]
0002167
Scoliosis 0002650
30%-79% of people have these symptoms
Aplasia/Hypoplasia of the corpus callosum 0007370
Arachnodactyly
Long slender fingers
Spider fingers
[ more ]
0001166
Atrial septal defect
An opening in the wall separating the top two chambers of the heart
Hole in heart wall separating two upper heart chambers
[ more ]
0001631
Attention deficit hyperactivity disorder
Attention deficit
Attention deficit disorder
Attention deficit-hyperactivity disorder
Attention deficits
Childhood attention deficit/hyperactivity disorder
[ more ]
0007018
Hypoplasia of the maxilla
Decreased size of maxilla
Decreased size of upper jaw
Maxillary deficiency
Maxillary retrusion
Small maxilla
Small upper jaw
Small upper jaw bones
Upper jaw deficiency
Upper jaw retrusion
[ more ]
0000327
Joint hyperflexibility
Joints move beyond expected range of motion
0005692
Macroorchidism
Large testis
0000053
Narrow face
Decreased breadth of face
Decreased width of face
[ more ]
0000275
Pectus excavatum
Funnel chest
0000767
Prominent nasal bridge
Elevated nasal bridge
High nasal bridge
Prominent bridge of nose
Prominent nasal root
Protruding bridge of nose
Protruding nasal bridge
[ more ]
0000426
Short philtrum 0000322
5%-29% of people have these symptoms
Brachycephaly
Short and broad skull
0000248
Brachydactyly
Short fingers or toes
0001156
Camptodactyly of finger
Permanent flexion of the finger
0100490
Dental crowding
Crowded teeth
Dental overcrowding
Overcrowding of teeth
[ more ]
0000678
Hallucinations
Hallucination
Sensory hallucination
[ more ]
0000738
Low-set ears
Low set ears
Lowset ears
[ more ]
0000369
Protruding ear
Prominent ear
Prominent ears
[ more ]
0000411
Psychosis 0000709
Schizophrenia 0100753
Seizure 0001250
Percent of people who have these symptoms is not available through HPO
Abnormality of the genitourinary system 0000119
Abnormality of the rib cage 0001547
Abnormally folded helix 0008544
Agenesis of corpus callosum 0001274
Aggressive behavior
Aggression
Aggressive behaviour
Aggressiveness
[ more ]
0000718
Ascending tubular aorta aneurysm
Bulging of wall of large artery located above heart
0004970
Autism 0000717
Broad thumb
Broad thumbs
Wide/broad thumb
[ more ]
0011304
Deep philtrum 0002002
Emotional lability
Emotional instability
0000712
Flexion contracture
Flexed joint that cannot be straightened
0001371
Frontal bossing 0002007
Generalized hypotonia
Decreased muscle tone
Low muscle tone
[ more ]
0001290
Hyperactivity
More active than typical
0000752
Impaired social interactions
Impaired social interaction
Poor social interactions
[ more ]
0000735
Joint laxity
Joint instability
Lax joints
Loose-jointedness
Loosejointedness
[ more ]
0001388
Long face
Elongation of face
Increased height of face
Increased length of face
Vertical elongation of face
Vertical enlargement of face
Vertical overgrowth of face
[ more ]
0000276
Long nose
Elongated nose
Increased height of nose
Increased length of nose
Increased nasal height
Increased nasal length
Nasal elongation
[ more ]
0003189
Low frustration tolerance 0000744
Narrow nasal bridge
Narrow bridge of nose
Nasal Bridge, Narrow
Nasal bridge, thin
[ more ]
0000446
Obsessive-compulsive behavior
Obsessive compulsive behavior
0000722
Open mouth
Gaped jawed appearance
Gaped mouthed appearance
Slack jawed appearance
[ more ]
0000194
Prominent forehead
Pronounced forehead
Protruding forehead
[ more ]
0011220
Ventricular septal defect
Hole in heart wall separating two lower heart chambers
0001629
X-linked recessive inheritance 0001419
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Last updated: 7/1/2020

If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.

If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.

You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.

Healthcare Resources


Related diseases are conditions that have similar signs and symptoms. A health care provider may consider these conditions in the table below when making a diagnosis. Please note that the table may not include all the possible conditions related to this disease.

Conditions with similar signs and symptoms from Orphanet
Differential diagnosis includes the fragile X syndrome (molecular analysis of the FMR-1 gene), Marfan syndrome (cardiac and ophthalmologic examination) (see these terms), and homocystinuria (biochemical analysis). Lujan-Fryns syndrome should be considered in the differential diagnosis of schizophrenia.
Visit the Orphanet disease page for more information.

These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

Where to Start

In-Depth Information

  • GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions.
  • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
  • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Lujan syndrome. Click on the link to view a sample search on this topic.

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  1. Lyons MJ. MED12-Related Disorders. GeneReviews. June 6, 2013; http://www.ncbi.nlm.nih.gov/books/NBK1676/. Accessed 10/15/2015.
  2. Lujan syndrome. Genetics Home Reference. December, 2012; http://ghr.nlm.nih.gov/condition/lujan-syndrome. Accessed 10/15/2015.