Associated malformations in the family of a patient with Meckel syndrome: heterozygous expression?

Area of Science:

• Genetics
• Medical Genetics
• Pediatric Genetics

Background:

• Meckel syndrome is a lethal, autosomal recessive genetic disorder.
• The genetic basis of Meckel syndrome is not fully understood.
• Autosomal recessive diseases can sometimes exhibit partial expression in heterozygotes.

Purpose of the Study:

• To describe a family with Meckel syndrome exhibiting potential partial expression in heterozygotes.
• To discuss the implications of potential manifesting heterozygotes for genetic counseling and prenatal diagnosis.
• To highlight the need for identifying the gene responsible for Meckel syndrome.

Main Methods:

• Case report describing a family with Meckel syndrome.
• Clinical observation of malformations in relatives of the proband.
• Review of literature on autosomal recessive diseases and heterozygote expression.

Main Results:

• Four family members displayed minor malformations associated with Meckel syndrome.
• These findings suggest the possibility of manifesting heterozygotes in Meckel syndrome.
• The observed malformations could be partial expression or coincidental.

Conclusions:

• Partial expression of Meckel syndrome in heterozygotes is a possibility that warrants further investigation.
• Genetic counseling and prenatal diagnosis should be offered to relatives of Meckel syndrome patients.
• Cloning and sequencing the responsible gene are crucial for definitive diagnosis and understanding of Meckel syndrome.