TL

ChromosOmics - Database

> 2200 cases included

COUNTER

How to cite this database:
-
Liehr T. 2025. Constitutional Human Ring Chromosomes.
https://cs-tl.de/DB/CA/CR/0-Start.html [accessed on ...]

Visitors

in 2025:

last update: 22. July 2025

[VG-Wort ()]

Created by Dr. Thomas Liehr (PhD)
professional affiliation: Institute of Human Genetics, 07740 Jena, Germany;
e-mail: Thomas.Liehr@med.uni-jena.de or: LiehrT@web.de

AIM OF THIS PAGE			Number of characterized RCs by chromosome				How to use this page
			Thoughts about RCs
BREAKPOINTS BY CHROMOSOME
chr. 1	chr. 2	chr. 3		chr. 4	chr. 5	chr. 6		chr. 7	chr. 8
chr. 9	chr. 10	chr. 11		chr. 12	chr. 13	chr. 14		chr. 15	chr. 16
chr. 17	chr. 18	chr. 19		chr. 20	chr. 21	chr. 22		X-chr.	Y-chr.

DISCLAIMER
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References

Aim of this page

Collect all cases of constitutional human ring chromosomes in infertile and mentally retarded.

Thoughts about RCs

Thoughts on formation mechanisms of ring chromosomes see Refs {1, 144}.

RCs and tumor predisposition see Ref {591}.

Work of international consortium for human ring chromosomes see {1882}.

Rng chromosome as research tool for chromosome therapy see {1883-1887}.

How to use this page?

This page is organized like the 'sister-page' on small supernumerary marker chromosomes (sSMC)
- the structure is explained here.

Also take care that the nomenclature here may not always be done exactly acc. to ISCN !!

Number of ring chromosomes included in this page

chr.	cases
1	10
2	27
3	21
4	108
5	41
6	72
7	38
8	14
9	48
10	21
11	18
12	15
13	175
14	171
15	155
16	9
17	31
18	263
19	11
20	355
21	154
22	362
X	64
Y	20
SUMMARY	2203

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