Aneuploidy

Aneuploid

Chromosomes in Down syndrome, the most common condition due to aneuploidy. Notice the three copies of chromosome 21 in the last row.
Classification and external resources
Specialty Medical genetics
ICD-10 Q90-Q98
ICD-9-CM 758
MeSH D000782

Aneuploidy is the presence of an abnormal number of chromosomes in a cell, for example when having 45 or 47 chromosomes when 46 is expected in a human cell.[1] It does not include a difference of one or more complete sets of chromosomes, which is called euploidy.[1] An extra or missing chromosome is a common cause of genetic disorders, including some human birth defects. Some cancer cells also have abnormal numbers of chromosomes.[2] Aneuploidy originates during cell division when the chromosomes do not separate properly between the two cells.

Different species normally have different numbers of chromosomes from one another, and the terms "aneuploid" and "polyploid" refer to the chromosome number being different from the usual number for that species.

Chromosome abnormalities are detected in 1 of 160 live human births. Apart from sex chromosome disorders, most cases of aneuploidy result in death of the developing fetus (miscarriage); the most common extra autosomal chromosomes among live births are 21, 18 and 13.[3]

Chromosomes

Most cells in the human body have 23 pairs of chromosomes, or a total of 46 chromosomes. (The sperm and egg, or gametes, each have 23 unpaired chromosomes, and red blood cells have no nucleus and no chromosomes.)

One copy of each pair is inherited from the mother and the other copy is inherited from the father. The first 22 pairs of chromosomes (called autosomes) are numbered from 1 to 22, from largest to smallest. The 23rd pair of chromosomes are the sex chromosomes. Normal females have two X chromosomes, while normal males have one X chromosome and one Y chromosome. The characteristics of the chromosomes in a cell as they are seen under a light microscope are called the karyotype.

During meiosis, when germ cells divide to create sperm and egg (gametes), each half should have the same number of chromosomes. But sometimes, the whole pair of chromosomes will end up in one gamete, and the other gamete will not get that chromosome at all.

Most embryos cannot survive with a missing or extra autosome (numbered chromosome) and are spontaneously aborted. The most frequent aneuploidy in humans is trisomy 16, although fetuses affected with the full version of this chromosome abnormality do not survive to term (it is possible for surviving individuals to have the mosaic form, where trisomy 16 exists in some cells but not all). The most common aneuploidy that infants can survive with is trisomy 21, which is found in Down syndrome, affecting 1 in 800 births. Trisomy 18 (Edwards syndrome) affects 1 in 6,000 births, and trisomy 13 (Patau syndrome) affects 1 in 10,000 births. 10% of infants with trisomy 18 or 13 reach 1 year of age.[4]

Changes in chromosome number may not necessarily be present in all cells in an individual. When aneuploidy is detected in a fraction of cells in an individual, it is called chromosomal mosaicism. In general, individuals who are mosaic for a chromosomal aneuploidy tend to have a less severe form of the syndrome compared to those with full trisomy. For many of the autosomal trisomies, only mosaic cases survive to term. However, mitotic aneuploidy may be more common than previously recognized in somatic tissues, and aneuploidy is a characteristic of many types of tumorigenesis (see below).

Terminology

In the strict sense, a chromosome complement having a number of chromosomes other than 46 (in humans) is considered heteroploid while an exact multiple of the haploid chromosome complement is considered euploid.

Number of chromosomes Name Description
1 Monosomy Monosomy refers to lack of one chromosome of the normal complement. Partial monosomy can occur in unbalanced translocations or deletions, in which only a portion of the chromosome is present in a single copy (see deletion (genetics)). Monosomy of the sex chromosomes (45,X) causes Turner syndrome.
2 Disomy Disomy is the presence of two copies of a chromosome. For organisms such as humans that have two copies of each chromosome (those that are diploid), it is the normal condition. For organisms that normally have three or more copies of each chromosome (those that are triploid or above), disomy is an aneuploid chromosome complement. In uniparental disomy, both copies of a chromosome come from the same parent (with no contribution from the other parent).
3 Trisomy Trisomy refers to the presence of three copies, instead of the normal two, of a particular chromosome. The presence of an extra chromosome 21, which is found in Down syndrome, is called trisomy 21. Trisomy 18 and Trisomy 13, known as Edwards Syndrome and Patau Syndrome, respectively, are the two other autosomal trisomies recognized in live-born humans. Trisomy of the sex chromosomes is possible, such as in (47,XXX), (47,XXY), and (47,XYY).
4/5 tetrasomy/pentasomy Tetrasomy and pentasomy are the presence of four or five copies of a chromosome, respectively. Although rarely seen with autosomes, sex chromosome tetrasomy and pentasomy have been reported in humans, including XXXX, XXYY, XXXXX, XXXXY and XYYYY.[5]

Mechanisms

Nondisjunction usually occurs as the result of a weakened mitotic checkpoint, as these checkpoints tend to arrest or delay cell division until all components of the cell are ready to enter the next phase. If a checkpoint is weakened, the cell may fail to 'notice' that a chromosome pair is not lined up on the mitotic plate, for example. In such a case, most chromosomes would separate normally (with one chromatid ending up in each cell), while others could fail to separate at all. This would generate a daughter cell lacking a copy and a daughter cell with an extra copy.

Completely inactive mitotic checkpoints may cause non-disjunction at multiple chromosomes, possibly all. Such a scenario could result in each daughter cell possessing a disjoint set of genetic material.

Merotelic attachment occurs when one kinetochore is attached to both mitotic spindle poles. One daughter cell would have a normal complement of chromosomes; the second would lack one. A third daughter cell may end up with the 'missing' chromosome.

Multipolar spindles: more than two spindle poles form. Such a mitotic division would result in one daughter cell for each spindle pole; each cell may possess an unpredictable complement of chromosomes.

Monopolar spindle: only a single spindle pole forms. This produces a single daughter cell with its copy number doubled.

A tetraploid intermediate may be produced as the end-result of the monopolar spindle mechanism. In such a case, the cell has double the copy number of a normal cell, and produces double the number of spindle poles as well. This results in four daughter cells with an unpredictable complement of chromosomes, but in the normal copy number.

Somatic mosaicism in the nervous system

Mosaicism for aneuploid chromosome content may be part of the constitutional make-up of the mammalian brain.[6] In the normal human brain, brain samples from six individuals ranging from 2–86 years of age had mosaicism for chromosome 21 aneuploidy (average of 4% of neurons analyzed).[7] This low-level aneuploidy appears to arise from chromosomal segregation defects during cell division in neuronal precursor cells,[8] and neurons containing such aneuploid chromosome content reportedly integrate into normal circuits.[9]

Somatic mosaicism in cancer

Aneuploidy is consistently observed in virtually all cancers.[10] Somatic mosaicism occurs in virtually all cancer cells, including trisomy 12 in chronic lymphocytic leukemia (CLL) and trisomy 8 in acute myeloid leukemia (AML). However, these forms of mosaic aneuploidy occur through mechanisms distinct from those typically associated with genetic syndromes involving complete or mosaic aneuploidy, such as chromosomal instability[11] (due to mitotic segregation defects in cancer cells). Therefore, the molecular processes that lead to aneuploidy are targets for the development of cancer drugs. Both resveratrol and aspirin have been found in vivo (in mice) to selectively destroy tetraploid cells that may be precursors of aneuploid cells, and activate AMPK, which may be involved in the process.[12]

Alteration of normal mitotic checkpoints are also important tumorogenic events, and these may directly lead to aneuploidy.[13] Loss of tumor suppressor p53 gene often results in genomic instability, which could lead to the aneuploidy genotype.[14]

In addition, genetic syndromes in which an individual is predisposed to breakage of chromosomes (chromosome instability syndromes) are frequently associated with increased risk for various types of cancer, thus highlighting the role of somatic aneuploidy in carcinogenesis. It has been suggested that aneuploidy might directly contribute to carcinogenesis by disrupting the asymmetric division of adult stem cells, thereby leaving those cells capable of "limitless expansion".[15]

Partial aneuploidy

The terms "partial monosomy" and "partial trisomy" are used to describe an imbalance of genetic material caused by loss or gain of part of a chromosome. In particular, these terms would be used in the situation of an unbalanced translocation, where an individual carries a derivative chromosome formed through the breakage and fusion of two different chromosomes. In this situation, the individual would have three copies of part of one chromosome (two normal copies and the portion that exists on the derivative chromosome) and only one copy of part of the other chromosome involved in the derivative chromosome.

Aneuploidogens

Agents capable of causing aneuploidy are called aneuploidogens. Many mutagenic carcinogens are aneuploidogens. X-rays, for example, may cause aneuploidy by fragmenting the chromosome; it may also target the spindle apparatus.[16] Other chemicals such as colchicine can also produce aneuploidy by affecting microtubule polymerization.

Exposure of males to lifestyle, environmental and/or occupational hazards may increase the risk of spermatozoa aneuploidy.[17] Tobacco smoke contains chemicals that cause DNA damage.[18] Smoking also can induce aneuploidy. For instance, smoking increases chromosome 13 disomy in spermatozoa by 3-fold,[19] and YY disomy by 2-fold.[20]

Occupational exposure to benzene is associated with a 2.8-fold increase of XX disomy and a 2.6-fold increase of YY disomy in spermatozoa.[21]

Pesticides are released to the environment in large quantities so that most individuals have some degree of exposure. The insecticides fenvalerate and carbaryl have been reported to increase spermatozoa aneuploidy. Occupational exposure of pesticide factory workers to fenvalerate is associated with increased spermatozoa DNA damage.[22] Exposure to fenvalerate raised sex chromosome disomy 1.9-fold and disomy of chromosome 18 by 2.6-fold.[23] Exposure of male workers to carbaryl increased DNA fragmentation in spermatozoa, and also increased sex chromosome disomy by 1.7-fold and chromosome 18 disomy by 2.2-fold.[24]

Humans are exposed to perfluorinated compounds (PFCs) in many commercial products.[25] Men contaminated with PFCs in whole blood or seminal plasma have spermatozoa with increased levels of DNA fragmentation and chromosomal aneuploidies.[25]

Diagnosis

Further information: Prenatal diagnosis
Example of Trisomy 21 detected via quantitative PCR Short Tandem Repeat assay

Germline aneuploidy is typically detected through karyotyping, a process in which a sample of cells is fixed and stained to create the typical light and dark chromosomal banding pattern and a picture of the chromosomes is analyzed. Other techniques include Fluorescence In Situ Hybridization (FISH), quantitative PCR of Short Tandem Repeats, quantitative fluorescence PCR (QF-PCR), quantitative PCR dosage analysis, Quantitative Mass Spectrometry of Single Nucleotide Polymorphisms, and Comparative Genomic Hybridization (CGH).

These tests can also be performed prenatally to detect aneuploidy in a pregnancy, through either amniocentesis or chorionic villus sampling. Pregnant women of 35 years or older are offered prenatal diagnosis because the chance of chromosomal aneuploidy increases as the mother's age increases.

Recent advances have allowed for less invasive testing methods based on the presence of fetal genetic material in maternal blood.

Types

key
colorsignificance
lethal
normal male phenotype
Klinefelter syndrome (abnormal male)
polysomy X and/or Y, (abnormal male)
normal female phenotype
Turner's syndrome (abnormal female)
tetrasomy X, pentasomy X, (abnormal female)
Non-autosomal
0 X XX XXX XXXX XXXXX
0 00 X0 XX XXX XXXX XXXXX
Y Y0 XY XXY XXXY XXXXY XXXXXY
YY YY XYY XXYY XXXYY XXXXYY XXXXXYY
YYY YYY XYYY XXYYY XXXYYY XXXXYYY XXXXXYYY
YYYY YYYY XYYYY XXYYYY XXXYYYY XXXXYYYY XXXXXYYYY
YYYYY YYYYY XYYYYY XXYYYYY XXXYYYYY XXXXYYYYY XXXXXYYYYY
key
colorsignificance
case where complete non-mosaic trisomy can never survive to term
case where complete non-mosaic trisomy can occasionally (barring other complications) survive to term
case where complete non-mosaic trisomy can always (barring other complications) survive to term
Autosomal
#monosomytrisomy
1 1p36 deletion syndrome
1q21.1 deletion syndrome 		Trisomy 1
2 2q37 deletion syndrome Trisomy 2
3 Trisomy 3
4 Wolf-Hirschhorn syndrome Trisomy 4
5 Cri du chat
5q deletion syndrome		 Trisomy 5
6 Trisomy 6
7 Williams syndrome Trisomy 7
8 Monosomy 8p
Monosomy 8q 		Trisomy 8
9 Alfi's syndrome
Kleefstra syndrome 		Trisomy 9
10 Monosomy 10p
Monosomy 10q		 Trisomy 10
11 Jacobsen syndrome Trisomy 11
12 Trisomy 12
13 Patau syndrome
14 Trisomy 14
15 Angelman syndrome
Prader–Willi syndrome 		Trisomy 15
16 Trisomy 16
17 Miller-Dieker syndrome
Smith-Magenis syndrome 		Trisomy 17
18 Distal 18q-
Proximal 18q- 		Edwards syndrome
19 Trisomy 19
20 Trisomy 20
21 Down syndrome
22 DiGeorge syndrome
Phelan-McDermid syndrome
22q11.2 distal deletion syndrome 		Cat eye syndrome
Trisomy 22

See also

References

  1. 1 2 Griffiths AJF, Miller JH, Suzuki DT, (2000). An Introduction to Genetic Analysis (7 ed.). pp. Chaper 18.
  2. ↑ Sen S (January 2000). "Aneuploidy and cancer". Current Opinion in Oncology 12 (1): 82–8. doi:10.1097/00001622-200001000-00014. PMID 10687734.
  3. ↑ Driscoll DA, Gross S (June 2009). "Clinical practice. Prenatal screening for aneuploidy". The New England Journal of Medicine 360 (24): 2556–62. doi:10.1056/NEJMcp0900134. PMID 19516035.
  4. ↑ Griffiths, Anthony JF; Miller, Jeffrey H; Suzuki, David T; Lewontin, Richard C; Gelbart, William M (2000). "Chromosome Mutation II: Changes in Chromosome Number". An Introduction to Genetic Analysis (7th ed.). New York: W. H. Freeman. ISBN 978-0-7167-3520-5. Retrieved 2009-06-21.
  5. ↑ Linden MG, Bender BG, Robinson A (October 1995). "Sex chromosome tetrasomy and pentasomy". Pediatrics 96 (4 Pt 1): 672–82. PMID 7567329.
  6. ↑ Rehen SK, McConnell MJ, Kaushal D, Kingsbury MA, Yang AH, Chun J (November 2001). "Chromosomal variation in neurons of the developing and adult mammalian nervous system". Proceedings of the National Academy of Sciences of the United States of America 98 (23): 13361–6. doi:10.1073/pnas.231487398. PMC 60876. PMID 11698687.
  7. ↑ Rehen SK, Yung YC, McCreight MP; et al. (March 2005). "Constitutional aneuploidy in the normal human brain". The Journal of Neuroscience 25 (9): 2176–80. doi:10.1523/JNEUROSCI.4560-04.2005. PMID 15745943.
  8. ↑ Yang AH, Kaushal D, Rehen SK; et al. (November 2003). "Chromosome segregation defects contribute to aneuploidy in normal neural progenitor cells". The Journal of Neuroscience 23 (32): 10454–62. PMID 14614104.
  9. ↑ Kingsbury MA, Friedman B, McConnell MJ; et al. (April 2005). "Aneuploid neurons are functionally active and integrated into brain circuitry". Proceedings of the National Academy of Sciences of the United States of America 102 (17): 6143–7. doi:10.1073/pnas.0408171102. PMC 1087909. PMID 15837924.
  10. ↑ Rajagopalan, Harith; Christoph Lengauer (18 November 2004). "Progress Aneuploidy and cancer". Nature 432 (7015): 338–341. doi:10.1038/nature03099. PMID 15549096.
  11. ↑ Hassold, Terry; Patricia Hunt (April 2001). "To err (meiotically) is human: the genesis of human aneuploidy". Nature Reviews Genetics 2 (4): 280–291. doi:10.1038/35066065. PMID 11283700.
  12. ↑ Marcia Malory. "Aspirin and resveratrol could prevent cancer by killing tetraploid cells, research shows". Medical Xpress.
  13. ↑ Kops, Geert J. P. L.; Beth A. A. Weaver; Don W. Cleveland (October 2005). "On the road to cancer: aneuploidy and the mitotic checkpoint". Nature Reviews Cancer 5 (10): 773–785. doi:10.1038/nrc1714. PMID 16195750.
  14. ↑ Clemens A. Schmitt; Fridman, JS; Yang, M; Baranov, E; Hoffman, RM; Lowe, SW (April 2002). "Dissecting p53 tumor suppressor functions in vivo". Cancer Cell 1 (3): 289–298. doi:10.1016/S1535-6108(02)00047-8. PMID 12086865.
  15. ↑ Zhang F, Zhao D, Wang S, Hong L, Li Q (2007). "Aneuploidy directly contribute to carcinogenesis by disrupting the asymmetric division of adult stem cells". Medical Hypotheses 68 (1): 237–8. doi:10.1016/j.mehy.2006.06.007. PMID 16890378.
  16. ↑ Duesberg, P.; Rasnick, D. (2000). "Aneuploidy, the somatic mutation that makes cancer a species of its own". Cell Motility and the Cytoskeleton 47 (2): 81–107. doi:10.1002/1097-0169(200010)47:2<81::AID-CM1>3.0.CO;2-#. PMID 11013390.
  17. ↑ Templado C, Uroz L, Estop A (2013). "New insights on the origin and relevance of aneuploidy in human spermatozoa". Mol. Hum. Reprod. 19 (10): 634–43. doi:10.1093/molehr/gat039. PMID 23720770.
  18. ↑ Bernstein C, Prasad AR, Nfonsam V, Bernstein H. (2013). DNA Damage, DNA Repair and Cancer, New Research Directions in DNA Repair, Prof. Clark Chen (Ed.), ISBN 978-953-51-1114-6, InTech, http://www.intechopen.com/books/new-research-directions-in-dna-repair/dna-damage-dna-repair-and-cancer
  19. ↑ Shi Q, Ko E, Barclay L, Hoang T, Rademaker A, Martin R (2001). "Cigarette smoking and aneuploidy in human sperm". Mol. Reprod. Dev. 59 (4): 417–21. doi:10.1002/mrd.1048. PMID 11468778.
  20. ↑ Rubes J, Lowe X, Moore D, Perreault S, Slott V, Evenson D, Selevan SG, Wyrobek AJ (1998). "Smoking cigarettes is associated with increased sperm disomy in teenage men". Fertil. Steril. 70 (4): 715–23. PMID 9797104.
  21. ↑ Xing C, Marchetti F, Li G, Weldon RH, Kurtovich E, Young S, Schmid TE, Zhang L, Rappaport S, Waidyanatha S, Wyrobek AJ, Eskenazi B (2010). "Benzene exposure near the U.S. permissible limit is associated with sperm aneuploidy". Environ. Health Perspect. 118 (6): 833–9. doi:10.1289/ehp.0901531. PMC 2898861. PMID 20418200.
  22. ↑ Bian Q, Xu LC, Wang SL, Xia YK, Tan LF, Chen JF, Song L, Chang HC, Wang XR (2004). "Study on the relation between occupational fenvalerate exposure and spermatozoa DNA damage of pesticide factory workers". Occup Environ Med 61 (12): 999–1005. doi:10.1136/oem.2004.014597. PMC 1740696. PMID 15550606.
  23. ↑ Xia Y, Bian Q, Xu L, Cheng S, Song L, Liu J, Wu W, Wang S, Wang X (2004). "Genotoxic effects on human spermatozoa among pesticide factory workers exposed to fenvalerate". Toxicology 203 (1-3): 49–60. doi:10.1016/j.tox.2004.05.018. PMID 15363581.
  24. ↑ Xia Y, Cheng S, Bian Q, Xu L, Collins MD, Chang HC, Song L, Liu J, Wang S, Wang X (2005). "Genotoxic effects on spermatozoa of carbaryl-exposed workers". Toxicol. Sci. 85 (1): 615–23. doi:10.1093/toxsci/kfi066. PMID 15615886.
  25. 1 2 Governini L, Guerranti C, De Leo V, Boschi L, Luddi A, Gori M, Orvieto R, Piomboni P (2014). "Chromosomal aneuploidies and DNA fragmentation of human spermatozoa from patients exposed to perfluorinated compounds". Andrologia 47: 1012–9. doi:10.1111/and.12371. PMID 25382683.

External links

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