Access to the Chromosomal Variation in Man Online Database is open to the public and freely available.

To use this database, all users must read and agree to the Terms of Service Agreement.

Click here to access the database.


The database of CHROMOSOMAL VARIATION IN MAN consists of a systematic collection of important citations from the world's literature reporting on all common and rare chromosomal alterations, phenotypes, and abnormalities in humans. The database is organized by variations and anomalies, numerical anomalies, and chromosomal breakage syndromes. It contains over 24,000 entries updated continuously since 1974. Among its features are:

Developed by Digamber S. Borgaonkar utilizing his own unique method of arrangement of data, each citation in the database must be unique, a first citation, or a recent citation. The data is arranged by chromosome, arm, region, band, and sub-band. Similarly all the data of aneuploidies are followed by chromosome numbers. In each point of entry, all citations are then arranged alphabetically. Access to this database on-line will make the work of any researcher in cytogenetics easier and faster.

This database is intended for use primarily by cytogeneticists, genetics researchers, other professionals concerned with genetic disorders, and by advanced students in science and medicine. Individuals without an expertise in these areas are strongly urged to seek the assistance of an expert in the interpretation of data found in this database.

It is important to note that in compiling the database all reports have not been cited. It has been the goal to provide key references on all kinds of chromosomal variants and anomalies, and through these, users should be able to locate the literature on any given condition or topic. Of the numerous reports on relatively common conditions, only a few reports have been catalogued on the basis of priority, uniqueness, or general coverage. Reports on chromosome changes in tumors, cancers, and leukemic cell lines have been almost entirely excluded. Data on experimentally reproduced chromosomal break points have also been excluded.

Any inquiries regarding the Online Database can be directed to us at

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