Genetic Primary Microcephalies: When Centrosome Dysfunction Dictates Brain and Body Size

Area of Science:

• Genetics
• Developmental Biology
• Neuroscience

Background:

• Primary microcephalies (PMs) are congenital brain growth defects leading to neurodevelopmental disorders.
• These conditions often result from mutations in genes encoding centrosome or microtubule-associated proteins crucial for neural progenitor cell division.

Purpose of the Study:

• To provide an overview of various types of primary microcephalies.
• To analyze the genetic, developmental, neurological, and cognitive characteristics of representative PMs.
• To elucidate the functions and interrelationships of PM proteins in human development.

Main Methods:

• Review and synthesis of existing literature on primary microcephalies.
• Comparative analysis of patient phenotypes to understand protein functions.
• Examination of genetic, developmental, neurological, and cognitive data.

Main Results:

• PMs present diverse phenotypes, including isolated forms, those with cortical malformations, microcephalic dwarfism, and sensorineural disorders.
• Proteins like ASPM and WDR62 primarily influence brain size and structure, suggesting functional redundancy.
• Pericentrin (PCNT) is essential for both brain and body size determination, highlighting varied protein roles.

Conclusions:

• Phenotypic comparisons reveal the distinct and overlapping functions of PM proteins.
• Understanding these proteins is key to deciphering mechanisms of brain and body size regulation.
• Further research into PM protein interrelationships can illuminate neurodevelopmental pathways.