HomeFAQ SectionAneuploidy-Know what is Anueploidy | Types | Causes and symptoms.

Aneuploidy-Know what is Anueploidy | Types | Causes and symptoms.

Aneuploidy-Know what is Anueploidy | Types | Causes and symptoms.


Aneuploidy is a genetic condition characterized by an abnormal number of chromosomes in a cell, deviating from the usual count of 46 chromosomes

It arises when there is an error during the formation of egg or sperm cells leading to an imbalance in the number of chromosomes inherited from the biological parents the total number of chromosomes may exceed 46

resulting in trisomy (47 chromosomes) or it may be less than 46 leading to monosomy (45 chromosomes)

These deviations from the standard chromosomal count can have significant implications for pregnancy outcomes

A change in the number of chromosomes acquired from either parent can impact the development of a fetus and potentially lead to complications

Aneuploidy is commonly associated with an increased risk of miscarriage particularly during the first trimester of pregnancy

Research suggests that nearly half of the pregnancies that end in miscarriage in the early stages are affected by aneuploidy.

It is important to recognize that aneuploidy can occur sporadically throughout an individual’s life, but it is more frequently observed as an error during the formation of reproductive cells

These chromosomal abnormalities can have profound consequences on the genetic makeup of offspring and may give rise to various genetic disorders

Understanding aneuploidy and its impact on pregnancy outcomes is crucial for healthcare professionals and individuals planning to start a family

Genetic counseling and prenatal screening tests can help assess the risk of aneuploidy and

provide valuable information for making informed decisions regarding pregnancy management and potential interventions.


There are two varieties of aneuploidy:


A kind of aneuploidy characterised by the loss of a single chromosome it is represented by the 2n-1 nucleus and may be caused by nondisjunction during cellular division particularly meiosis


A kind of aneuploidy that has an additional copy of the chromosome 2n + 1 is used to denote it and results from nondisjunction i.e.when one chromosome pair does not split properly during cell division especially meiosis




Aneuploidy, an abnormal number of chromosomes in a cell, can affect various individuals:


  1. Embryos and Fetuses: Aneuploidy during development can lead to conditions like Down syndrome, Edwards syndrome and Patau syndrome


  1. Genetic Disorders: Aneuploidy can cause conditions like Turner syndrome (monosomy X) or Klinefelter syndrome (XXY).


  1. Reproductive Cells: Aneuploidy in eggs or sperm can lead to infertility, miscarriage or genetic disorders in offspring

Aneuploidy is common in cancer cells and can contribute to tumor growth progression and treatment resistance

The impact of aneuploidy varies depending on the chromosomes involved and the extent of the abnormality





How often are aneuploidies?

About 1 out of every 150 pregnancies are affected by foetal aneuploidy, which accounts for 50% of early pregnancy losses


What are the Symptoms?

An early pregnancy termination, or miscarriage is the most typical sign of aneuploidy. A miscarriage can happen at any moment although it typically happens during the first three months of pregnancy

Miscarriage signs and symptoms include:

  • Lower backaches and abdominal discomfort.
  • Cramps.
  • Moderate to severe bleeding.

Although genetic disorders like aneuploidy are the cause of 50% of miscarriages, it is still possible for a baby to be born with the diagnosis

Aneuploid babies are far more prone to experience developmental delays and intellectual problems as well as birth abnormalities






Causes of anueploidy

An genetic mistake, which most frequently occurs prior to the fertilisation of sperm and egg cells, results in aneuploidy

As cells divide new cells are created. This procedure also known as meiosis takes place when a single cell (which has 46 chromosomes) splits twice to produce two cells (gametes) each of which has half as many chromosomes as the original cell (23)

The sex cells in your body, known as gametes, are known as sperm in men and eggs in women When chromosomal pairs fail to split and complete cell division during meiosis aneuploidy results

Aneuploidy occurs at random and without warning You never know when the copying error could appear in your DNA just like your office printer could break down through a genetics .


Malignant Mesothelioma


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