Dominantly inherited microcephaly, hypotelorism and normal intelligence

Area of Science:

• Medical Genetics
• Clinical Neurology
• Human Physiology

Background:

• Microcephaly, characterized by a smaller than normal head circumference, can be associated with intellectual disability.
• Dominantly inherited conditions affecting head size and facial features require thorough investigation.
• Understanding the genetic and phenotypic spectrum of microcephaly is crucial for accurate diagnosis and counseling.

Observation:

• A multi-generational family exhibited a unique pattern of microcephaly and hypotelorism.
• Facial similarities including malar hypoplasia were noted among affected members.
• Psychometric assessments confirmed normal intelligence across two generations.

Findings:

• Cranial computed tomography (CT) scans revealed no structural brain abnormalities.
• The inheritance pattern suggests a dominant mode for this specific microcephaly phenotype.
• Normal intelligence despite reduced head circumference challenges typical associations.

Implications:

• Highlights the importance of comprehensive family studies in diagnosing rare genetic disorders.
• Emphasizes the necessity of psychometric testing to accurately assess cognitive function in microcephaly.
• Suggests that microcephaly without intellectual disability may represent distinct genetic entities requiring specialized diagnostic approaches.