Lawrence-Moon-Biedl syndrome

  • Lawrence-Moon syndrome.

INCIDENCE

  • This syndrome and the Bardet-Biedl syndrome have, in the past, been confused with one another because both of them share many of the same characteristics.
  • Both syndromes are characterized by learning disabilities, problems with vision, spasticity, and small genitalia.
  • It is not known the actual incidence, but it has been reported that the Arab populations in Kuwait have a higher incidence than is found anywhere else in the world.
  • It appears that males and females are impacted in equal measure.

HISTORY

  • The Lawrence-Moon-Biedl syndrome was initially referred to for the very first time in the year 1866.
  • In 1920, the Bardet-Biedl syndrome was identified, along with the characteristics that are shared by both Bardet-Biedl and Bardet-Scheinker syndromes.
  • In more recent times, the two syndromes have only been recognized as two separate entities since they were separated out as such.

CAUSATION

  • The trait is passed down through generations in an autosomal dominant fashion.
    • This is a condition in which the signs and symptoms become progressively more severe as time goes on in the patient's life.
    • Because of this fact, it is believed that it is likely that the typical characteristics are caused by an enzyme defect that has not yet been discovered.
  • When a child within a family has been identified as having Lawrence-Moon-Biedl syndrome, it is recommended that the family seek genetic counseling.
  • At this time, there is no prenatal test that is particularly tailored to your situation.

CHARACTERISTICS

  • The Lawrence-Moon-Biedl syndrome is characterized by four primary characteristics.
  • Children who are only mildly affected by it to those who have a severe learning disability are included in the group of children who always have learning disabilities, although the degree to which they are affected by it can vary.
  • As development continues, this disability becomes more and more obvious to everyone.
  • The specific facets of delayed development, which are typically of a global and all-encompassing nature, should be identified during routine visits to developmental clinics.
  • As the child gets older, visual issues, such as retinitis pigmentosa, become more noticeable again.
    • As soon as the child is able to verbalize his or her difficulties in this direction, it will be possible to notice that the child has difficulty seeing in the dark, and eventually complete night-blindness will occur.
    • During the ophthalmic examination, it was discovered that the retina was thinner than normal, with excess pigment being visible initially on the outskirts of the retina.
    • This pigmentation eventually spreads and causes problems with central vision.
  • When a person's walking should be becoming more steady, they start to show signs of ataxia instead.
  • This distressing characteristic gradually worsens until it ultimately results in paralysis, which is accompanied by spastic limbs.
  • Boys' sexual organs, which are easily identifiable, are typically underdeveloped and undersized.
    • This is something that is there from birth, but it might not become apparent until later in life, when the lack of further development becomes more obvious.

MANAGEMENT IMPLICATIONS

  • Help can be provided in specific areas, such as speech and basic learning skills, once it is determined that the individual has a delay in their development through a series of developmental checks.
  • In the future, when the child with Lawrence-Moon-Biedl syndrome is approaching the school age years, it will be necessary to conduct a comprehensive multidisciplinary assessment in order to determine the most appropriate educational facilities for the child.
  • The kind of education that is pursued will need to be reexamined at some point in the future because, unfortunately, progressive physical disabilities are inevitable.
    • When it comes to education, of course, a great deal will be determined by the options that are available in the surrounding area.
  • As the child matures, they will experience a decline in their vision.
  • In the beginning, the child's central vision will be relatively normal, but the child's peripheral vision will be significantly impaired.
  • Even this good central vision will be lost as the pigmentation process continues to spread into the central area of the retina.
  • Regrettably, there is nothing that can be done to halt the steady decline of the patient's vision.
  • When contemplating a future in education, this decline in vision is another factor that must be taken into account.
  • In a similar vein, the ataxia that was first observed in early childhood will continue to worsen until, by the time the person reaches early adulthood, they are completely paralyzed with spastic limbs.

THE FUTURE

  • For children afflicted with Lawrence-Moon-Biedl syndrome, the prognosis is not good.
  • The prognosis is not encouraging, as it predicts progressive vision loss as well as the gradual onset of spastic paraplegia.
  • During these years, both parents and children will have significant support and emotional assistance needs.