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Chromosomal Aberration – Definition and Causes

A chromosomal aberration is a structural or numerical change in the chromosomes that can lead to genetic disorders and developmental abnormalities.

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Things worth knowing about "Chromosomal Aberration"

A chromosomal aberration is a structural or numerical change in the chromosomes that can lead to genetic disorders and developmental abnormalities.

What is a Chromosomal Aberration?

A chromosomal aberration refers to any deviation from the normal structure or number of chromosomes in human cells. Chromosomes carry the genetic information (DNA) and are normally present in 46 copies arranged in 23 pairs. Any change in this normal chromosomal structure or number can significantly affect a person´s development and health.

Types of Chromosomal Aberrations

Numerical Aberrations

Numerical chromosomal aberrations occur when the total number of chromosomes deviates from the standard. These include:

Trisomy: An extra copy of a chromosome is present (e.g., Trisomy 21 = Down syndrome).
Monosomy: A chromosome is missing entirely (e.g., Monosomy X = Turner syndrome).
Polyploidy: The entire chromosome set is multiplied (e.g., triploidy = three full sets of chromosomes).

Structural Aberrations

Structural chromosomal aberrations involve changes to the internal organization of one or more chromosomes. Common forms include:

Deletion: A segment of the chromosome is lost.
Duplication: A segment is copied and present in excess.
Inversion: A segment is reversed in orientation within the chromosome.
Translocation: A segment moves from one chromosome to another.
Insertion: A segment is inserted into a non-standard position.

Causes

Chromosomal aberrations usually arise from errors during cell division, particularly during meiosis (division of reproductive cells) or mitosis (division of somatic cells). Contributing factors may include:

Advanced maternal age (especially associated with trisomies)
Exposure to ionizing radiation (e.g., X-rays)
Chemical mutagens (e.g., certain medications or industrial chemicals)
Viral infections during early pregnancy
Genetic predisposition

Symptoms and Clinical Consequences

The clinical impact of a chromosomal aberration depends greatly on the type and extent of the change. Possible consequences include:

Intellectual disability or developmental delay
Physical malformations (e.g., congenital heart defects, skeletal anomalies)
Growth disorders
Infertility or recurrent miscarriage
Increased cancer risk (e.g., from somatic chromosomal aberrations in tumor cells)

Some chromosomal aberrations, particularly balanced translocations, may cause no symptoms in the carrier but can be passed on to children and result in serious conditions.

Diagnosis

Chromosomal aberrations are diagnosed through specialized genetic testing methods:

Karyotyping: Microscopic visualization and analysis of all chromosomes in a cell (chromosomal analysis).
FISH (Fluorescence In Situ Hybridization): A technique using fluorescent probes to identify specific chromosomal segments.
Array-CGH (Comparative Genomic Hybridization): A high-resolution method for detecting small deletions and duplications.
Prenatal diagnostics: Amniocentesis or chorionic villus sampling (CVS) to analyze fetal chromosomes.
Non-invasive Prenatal Testing (NIPT): A maternal blood test that analyzes cell-free fetal DNA.

Treatment and Management

There is currently no cure for chromosomal aberrations, as the genetic change is present in every affected cell. Management focuses on treating the symptoms and associated conditions:

Early intervention programs and physiotherapy for developmental delays
Surgical correction of organ malformations (e.g., heart surgery)
Hormone therapy (e.g., growth hormone in Turner syndrome)
Psychosocial support for affected individuals and their families
Genetic counseling for couples planning to have children

References

Strachan T, Read AP. Human Molecular Genetics. 4th ed. Garland Science; 2011.
Nussbaum RL, McInnes RR, Willard HF. Thompson and Thompson Genetics in Medicine. 8th ed. Elsevier; 2016.
World Health Organization (WHO). Genomics and World Health: Report of the Advisory Committee on Health Research. Geneva: WHO; 2002. Available at: https://www.who.int

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