Embryonic hypocellularity, blastogenetic malformations, and fetal growth restriction

Area of Science:

• Developmental Biology
• Embryology
• Medical Genetics

Background:

• Congenital malformations and fetal growth restriction (FGR) are complex conditions.
• The VACTERL association, a group of malformations, is rarely a Mendelian syndrome.
• Conditions like monozygotic twinning, maternal diabetes, and aneuploidy are linked to small embryos.

Purpose of the Study:

• To propose early embryonic hypocellularity as a unifying factor for congenital malformations and FGR.
• To explore the non-genetic pathogenesis of VACTERL association and single umbilical artery (SUA).
• To investigate the link between hypocellularity, mitochondrial disorders, and embryonic development.

Main Methods:

• Review of existing literature and case studies.
• Comparative analysis of etiological factors in VACTERL association and FGR.
• Hypothetical modeling of pathogenetic processes.

Main Results:

• Early embryonic hypocellularity is proposed as a common factor linking VACTERL association, FGR, and other developmental anomalies.
• A non-genetic pathogenesis is supported by the association of VACTERL with conditions like SUA, which is uncommon in Mendelian disorders.
• Hypocellularity may also explain the link between VACTERL and mitochondrial disorders due to reduced cellular energy impacting early growth.

Conclusions:

• Early embryonic hypocellularity offers a parsimonious explanation for the diverse associations with VACTERL and FGR.
• A non-genetic pathway involving hypocellularity is a plausible explanation for these developmental disorders.
• Further research into the mechanisms of hypocellularity and its impact on embryonic development is warranted.