Separates rearranged chromosomes and breakpoints involving more than one chromosome / Separates cell lines or clones // Separates recipient and donor cell lines in bone marrow transplants del: Deletion der: Derivative chromosome: dic: Dicentric chromosome: dim: diminished signal intensity dn: de novo (not inherited) chromosomal abnormality dup • Loss or gain of entire chromosomes – Monosomy –Trisomy • Structural – Deletions – IiInversions – Translocations • Plus more uncommon types of abnormalities – Derivative chromosome (der) • Used when only one chromosome of a translocation is present or • One chromosome has two or more structural abnormalities Intragenic deletions are not treated as deficiencies, but as alleles; at least two adjacent loci must be removed or disrupted before a lesion is considered a deletion. and the Nomenclature Working Group (1998) Recommendations for a nomenclature system for human gene mutations.Hum.Mut. Chromosome Structure In a post back in September, I quickly summarized the abnormalities that can occur with chromosomes as a whole (such as deletions, insertions, transversions, etc). Nomenclature Chromosomal Genes Nonmendelian Determinants Genetic Background Alleles Alleles created by recombinant DNA technology. The nomenclature for this deletion would be: 46,XX,del(1)(q24q31) Female with a deletion of chromosome 1 on the long arm (q) between bands q24 to q31. For a more detailed description of the mutation nomenclature, please, refer to: Nomenclature for the description of sequence variations by the Human Genome Variation Society, den Dunnen JT and Antonarakis SE (2000). Disruptions; Deletions. Complex changes, including translocations, are described using the recommendations of the accepted HGVS nomenclature named extension ISCN, based on the original proposal SVD-WG004 (ISCN<>HGVS)).The named ISCN extension has been developed in collaboration with Standing Committee on Human … Deficiencies (deletions) have the symbol Df(nA)m, where n is the number of the deleted chromosome, A is the chromosome arm and m is a specific designator. 15:7-12. deletion interstitial. The other 22 pairs of chromosomes were normal (not shown). Deletions are written as the name of the gene that is altered following by -Δ; for example arg2-Δ1, where the number 1 denotes a specific complete or partial deletion of arg2. chromosomal structural aberrations institute of biology and medical ... (phenotypically harmless): inversion translocation insertion unbalanced: deletion duplication isochromosome ring chromosome dicentric chromosome. Symbols and abbreviated terms used in the description of chromosomes and chromosomal abnormalities are listed below. Recently, a nomenclature system has been suggested for the description of changes (mutations and polymorphisms) in DNA and protein sequences [Antonarakis, S.E. Sequence changes can be very complex, involving a range of changes at one specific location. Replacements Some deletions occur more frequently and are associated with a particular syndrome such as 46,XX,5p-, also called cri-du-chat syndrome. For a detailed discussion of these terms, consult ISCN (1995): An International System for Human Cytogenetic Nomenclature, Mitelman, F (ed); S. Karger, Basel, 1995. There is so much more to learn (more than I could possibly put into one blog post), because the way chromosomes behave, depends on their structure and DNA… –Nomenclature –Deletions and Duplications –Translocations and Segregation Mechanisms –X-chromosome Abnormalities –Inversions and Recombinant Chromosomes •Cytogenetics in Cancer –Hematologic malignancies overview –Cytogenetic abnormalities and nomenclature –Genetic basis of cancer: oncogenes, tumor suppressors Duplications. deletion terminal. Hum.Mutat. https://clinicalsci.info/chromosome-nomenclature-and-g-banding