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D

Term Definition
De novo mutation

A genetic change in the DNA that happens for the first time in a patient, i.e., the parents do not carry the change.

Deficiency

A lower amount than necessary for functioning.

Dehydration

Excessive loss of water from the body or from an organ or body part, as from illness or fluid deprivation.

Developmental Disabilities

A chronic mental or physical impairment that results in decreased ability of an individual to reach appropriate age-level developmental goals.

DNA

Deoxyribonucleic acid (DNA) is the chemical inside the nucleus of all cells that carries the genetic instructions for making living organisms.

DNA sequencing (genome sequencing)

A multistage process that includes cloning, physical mapping, subcloning, determination of the DNA sequence of the nucleotide bases and information analysis. Sometimes the entire gene is decoded and sometimes only the most important parts are. Different people can have slightly different sequences (variants) with little or no impact on how well the gene works. However, some errors in a gene's sequence can have serious consequences.

DTaP vaccine

An immunization against diphtheria, tetanus, and pertussis (whooping cough) that is one of the recommended childhood immunizations. Five DTaP vaccines are recommended, usually given to children at ages 2 months, 4 months, 6 months, 15-18 months, and 4-6 years.

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