Correlations between behavior, memory, sleep-wake and melatonin in Williams-Beuren syndrome

Area of Science:

• Neuroscience
• Genetics
• Developmental Biology

Background:

• Williams-Beuren syndrome (WBS) is a neurodevelopmental disorder caused by a 7q11.23 microdeletion.
• WBS is characterized by distinct behavioral and neurocognitive phenotypes, including social-communicative strengths alongside visuospatial and cognitive deficits.
• Sleep disturbances and behavioral problems are commonly reported in WBS, with their underlying causes often unclear.

Purpose of the Study:

• To investigate behavioral phenotypes, memory function, and sleep disorders in individuals with WBS.
• To explore correlations between behavior, memory, sleep disturbances, and melatonin levels in WBS.
• To assess melatonin levels and circadian rhythm variations in WBS.

Main Methods:

• Utilized the Child Behavior Checklist (CBCL), Wechsler digit subtest, and Illinois Test of Psycholinguistic Abilities (ITPA) for behavioral and memory assessments.
• Employed the Sleep Disturbance Scale for Children (SDSC) to identify sleep disorders.
• Measured 24-hour urinary 6-sulfatoxymelatonin (aMT6s) via ELISA to assess melatonin levels and circadian rhythmicity using the Cosinor method.

Main Results:

• 87% of WBS individuals showed clinical scores for behavioral problems (anxiety, thought problems) and overall competence.
• Impaired auditory memory was universal, and visual sequential memory was affected in 47% of WBS cases.
• 65% of WBS individuals had indicative sleep disorders (respiratory, DIMS, hyperhidrosis), lower nocturnal melatonin levels, and 53% lacked melatonin circadian rhythm variation.

Conclusions:

• Individuals with WBS frequently experience behavioral and memory deficits, alongside sleep disturbances.
• Reduced melatonin levels and lack of circadian rhythm variation in aMT6s may be linked to sleep disorders in WBS.
• Sleep disturbances in WBS could adversely affect cognitive skills, particularly memory.