What is chromosomal deletion syndrome?

When parts of chromosomes are missing, a number of syndromes can occur. These syndromes are called chromosomal deletion syndromes. They tend to cause birth defects and limited intellectual development and physical development. In some cases, defects can be severe and affected children die during infancy or childhood.

What causes a chromosomal deletion?

Chromosomal deletions occur spontaneously at a low frequency, or are induced by treatment of germ cells (most efficiently, mature or maturing oocytes in the female, and postmeiotic spermatogenic cells in the male) with chromosome-breaking agents, such as acute radiation or certain chemicals.

Which condition is caused by chromosomal deletion?

DiGeorge syndrome, also known as 22q11.2 deletion syndrome, is a syndrome caused by the deletion of a small segment of chromosome 22. While the symptoms can vary, they often include congenital heart problems, specific facial features, frequent infections, developmental delay, learning problems and cleft palate.

What causes deletion syndrome?

A deletion syndrome is a genetic disorder caused by the deletion of genetic material. Several congenital conditions including Cri Du Chat Syndrome , DiGeorge Syndrome , 22q13 deletion syndrome, and Phelan-McDermid Syndrome are examples of deletion syndromes.

What is chromosome 10p deletion syndrome?

Chromosome 10p deletion is a chromosome abnormality that occurs when there is a missing ( deleted) copy of genetic material on the short arm (p) of chromosome 10. The severity and the signs and symptoms depend on the size and location of the deletion and which genes are involved.

Is Wolf-Hirschhorn syndrome a small deletion or large?

Wolf-Hirschhorn syndrome is caused by a deletion of genetic material near the end of the short (p) arm of chromosome 4. This chromosomal change is sometimes written as 4p-. The size of the deletion varies among affected individuals; studies suggest that larger deletions tend to result in more severe intellectual disability and physical abnormalities than smaller deletions.