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explain cytogenetic bands
I have a question about cytogenetic bands,I hope someone tell me what is cytogenetic bands and how to understand this noun well.
Thank you very much!
All best.
Thank you very much!
All best.
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Hi zhangxiaobo,
When chromosomes are stained (with for example Giemsa) in the metaphasis of mitosis the different chromosomes get stained according to their content of GC creating darker spots and whiter spots. These techniques are called Cytogenetics and are used to observe large genetic aberrations, like trisomies, large duplications/insertions/deletions/translocations and triploidies.
These different shadings are called bands each having a specific number e.g. 7p2.3 which is on the short arm of chromosome 7, the band 2, subband 3.
They are rarely used in molecular genetics but can serve as landmarks on chromosomes for orientation.
Hope that helps, -
Thanks for answering this somewhat off topic question ulz_peter!Comment
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Adding to the excellent description of ulz_peter. You can determine the cytogenetic band (also known as chromosome band) that corresponds to a particular gene or chromosome coordinate at the UCSC genome browser. For example, for human:
Under 'Mapping and Sequencing Tracks' is a track called 'Chromosome Band'. If you click on the name of this track, UCSC provides an excellent description:
"The chromosome band track represents the approximate location of bands seen on Giemsa-stained chromosomes. Chromosomes are displayed in the browser with the short arm first. Cytologically identified bands on the chromosome are numbered outward from the centromere on the short (p) and long (q) arms. At low resolution, bands are classified using the nomenclature [chromosome][arm][band], where band is a single digit. Examples of bands on chromosome 3 include 3p2, 3p1, cen, 3q1, and 3q2. At a finer resolution, some of the bands are subdivided into sub-bands, adding a second digit to the band number, e.g. 3p26. This resolution produces about 500 bands. A final subdivision into a total of 862 sub-bands is made by adding a period and another digit to the band, resulting in 3p26.3, 3p26.2, etc."Comment
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Thanks for your answer.It make me understand this clearly.Comment
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I can't compete with the UCSC Team...
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I’m not a sequencing expert. I’m a purification scientist who uses NGS to evaluate workflows my group develops. With this perspective, we think about the sample first and the NGS workflow second. The sequencer is an exceptionally honest reporter, but it can only report on what you give it, so whether you get clean, interpretable data from an NGS workflow is largely determined before you begin.
Here are nine questions we think about, in roughly the order they matter, before...06-18-2026, 07:11 AM -
Data variability is still an issue in sequencing technologies despite the advances in reproducibility and accuracy of these platforms. But the problem does not originate in the sequencing itself, but in the previous steps, before the sample reaches the sequencer.
The first step is collection, followed by preservation and sample preparation for analysis. Most scientists overlook those steps, but not being careful might just be skewing the experiment’s results.
...06-02-2026, 10:05 AM
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