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12 - Birth Defects and Genetic Disease in Sub-Saharan Africa

Published online by Cambridge University Press:  02 December 2019

By
Ambroise Wonkam
Edited by
Muntaser E. Ibrahim  and
Charles N. Rotimi
Muntaser E. Ibrahim
Affiliation:
University of Khartoum
Charles N. Rotimi
Affiliation:
National Human Genome Research Institute/NIH
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Summary

A birth defect is defined as any abnormality affecting body structures or function that is present from birth, or may be diagnosed only later in life. Causes can be divided broadly into two groups: genetic and partially genetic causes originating mostly before conception, and causes developing after conception but before birth. In industrialized countries, genetic abnormalities account for about 7 percent of birth defects, mainly numerical or structural chromosomal abnormalities, e.g., Down syndrome or single genes defects, e.g., sickle cell anemia. Partial genetic birth defects are due to a combination of genes that puts the fetus at risk in the presence of specific environmental factors, and account for an estimated 20–30 percent of all birth defects, a number of which are lethal, e.g., congenital heart disease (Turnpenny and Ellard 2007). Causes of birth defects originating after conception are primarily non-genetic. These include teratogens that interfere with normal growth and development of the embryo or fetus (maternal illness, maternal infections, drugs, radiation, and environmental pollutants), mechanical forces that deform the fetus, and vascular accidents that disrupt the normal growth of organs. This category accounts for an estimated 5–10 percent of all birth defects (Turnpenny and Ellard 2007). About 50 percent of birth defects are of unknown cause. These types of defects may be due to new mutations, submicroscopic chromosome deletions, or epigenetic modification. With ongoing advances in genomic technology, including affordable individual whole-genome sequencing, analysis of copy number variants, methylation, and genome-wide association studies, the underlying causes of more birth defects will become apparent (Butler 2009; Lupski et al. 2010; Stefansson et al. 2008; Vissers et al. 2009).

Type
Chapter
Information
The Genetics of African Populations in Health and Disease , pp. 268 - 310
Publisher: Cambridge University Press
Print publication year: 2019

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