Relative proximity of chromosome territories influences chromosome exchange partners in radiation-induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell line
It is well established that chromosomes exist in discrete territories (CTs) in interphase and are positioned in a cell-type specific probabilistic manner. The relative localisation of individual CTs within cell nuclei remains poorly understood, yet many cancers are associated with specific chromosom...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
2012
|
| _version_ | 1826284946993446912 |
|---|---|
| author | Themis, M Garimberti, E Estrada, G Arsuaga, J Hill, M Bridger, J Anderson, R |
| author_facet | Themis, M Garimberti, E Estrada, G Arsuaga, J Hill, M Bridger, J Anderson, R |
| author_sort | Themis, M |
| collection | OXFORD |
| description | It is well established that chromosomes exist in discrete territories (CTs) in interphase and are positioned in a cell-type specific probabilistic manner. The relative localisation of individual CTs within cell nuclei remains poorly understood, yet many cancers are associated with specific chromosome rearrangements and there is good evidence that relative territorial position influences their frequency of exchange. To examine this further, we characterised the complexity of radiation-induced chromosome exchanges in normal human bronchial epithelial (NHBE) cells by M-FISH analysis of PCC spreads and correlated the exchanges induced with their preferred interphase position, as determined by 1/2-colour 2D-FISH analysis, at the time of irradiation. We found that the frequency and complexity of aberrations induced were reduced in ellipsoid NHBE cells in comparison to previous observations in spherical cells, consistent with aberration complexity being dependent upon the number and proximity of damaged CTs, i.e. lesion proximity. To ask if particular chromosome neighbourhoods could be identified we analysed all radiation-induced pair-wise exchanges using SCHIP (statistics for chromosome interphase positioning) and found that exchanges between chromosomes (1;13), (9;17), (9;18), (12;18) and (16;21) all occurred more often than expected assuming randomness. All of these pairs were also found to be either sharing similar preferred positions in interphase and/or sharing neighbouring territory boundaries. We also analysed a human small cell lung cancer cell line, DMS53, by M-FISH observing the genome to be highly rearranged, yet possessing rearrangements also involving chromosomes (1;13) and (9;17). Our findings show evidence for the occurrence of non-random exchanges that may reflect the territorial organisation of chromosomes in interphase at time of damage and highlight the importance of cellular geometry for the induction of aberrations of varying complexity after exposure to both low and high-LET radiation. © 2013 The Authors. |
| first_indexed | 2024-03-07T01:21:29Z |
| format | Journal article |
| id | oxford-uuid:9080dd92-499e-4bfc-9e6a-dcd29f59f78e |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:21:29Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:9080dd92-499e-4bfc-9e6a-dcd29f59f78e2022-03-26T23:12:03ZRelative proximity of chromosome territories influences chromosome exchange partners in radiation-induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell lineJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9080dd92-499e-4bfc-9e6a-dcd29f59f78eSymplectic Elements at Oxford2012Themis, MGarimberti, EEstrada, GArsuaga, JHill, MBridger, JAnderson, RIt is well established that chromosomes exist in discrete territories (CTs) in interphase and are positioned in a cell-type specific probabilistic manner. The relative localisation of individual CTs within cell nuclei remains poorly understood, yet many cancers are associated with specific chromosome rearrangements and there is good evidence that relative territorial position influences their frequency of exchange. To examine this further, we characterised the complexity of radiation-induced chromosome exchanges in normal human bronchial epithelial (NHBE) cells by M-FISH analysis of PCC spreads and correlated the exchanges induced with their preferred interphase position, as determined by 1/2-colour 2D-FISH analysis, at the time of irradiation. We found that the frequency and complexity of aberrations induced were reduced in ellipsoid NHBE cells in comparison to previous observations in spherical cells, consistent with aberration complexity being dependent upon the number and proximity of damaged CTs, i.e. lesion proximity. To ask if particular chromosome neighbourhoods could be identified we analysed all radiation-induced pair-wise exchanges using SCHIP (statistics for chromosome interphase positioning) and found that exchanges between chromosomes (1;13), (9;17), (9;18), (12;18) and (16;21) all occurred more often than expected assuming randomness. All of these pairs were also found to be either sharing similar preferred positions in interphase and/or sharing neighbouring territory boundaries. We also analysed a human small cell lung cancer cell line, DMS53, by M-FISH observing the genome to be highly rearranged, yet possessing rearrangements also involving chromosomes (1;13) and (9;17). Our findings show evidence for the occurrence of non-random exchanges that may reflect the territorial organisation of chromosomes in interphase at time of damage and highlight the importance of cellular geometry for the induction of aberrations of varying complexity after exposure to both low and high-LET radiation. © 2013 The Authors. |
| spellingShingle | Themis, M Garimberti, E Estrada, G Arsuaga, J Hill, M Bridger, J Anderson, R Relative proximity of chromosome territories influences chromosome exchange partners in radiation-induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell line |
| title | Relative proximity of chromosome territories influences chromosome exchange partners in radiation-induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell line |
| title_full | Relative proximity of chromosome territories influences chromosome exchange partners in radiation-induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell line |
| title_fullStr | Relative proximity of chromosome territories influences chromosome exchange partners in radiation-induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell line |
| title_full_unstemmed | Relative proximity of chromosome territories influences chromosome exchange partners in radiation-induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell line |
| title_short | Relative proximity of chromosome territories influences chromosome exchange partners in radiation-induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell line |
| title_sort | relative proximity of chromosome territories influences chromosome exchange partners in radiation induced chromosome rearrangements in primary human bronchial epithelial cells and in a small cell lung cancer cell line |
| work_keys_str_mv | AT themism relativeproximityofchromosometerritoriesinfluenceschromosomeexchangepartnersinradiationinducedchromosomerearrangementsinprimaryhumanbronchialepithelialcellsandinasmallcelllungcancercellline AT garimbertie relativeproximityofchromosometerritoriesinfluenceschromosomeexchangepartnersinradiationinducedchromosomerearrangementsinprimaryhumanbronchialepithelialcellsandinasmallcelllungcancercellline AT estradag relativeproximityofchromosometerritoriesinfluenceschromosomeexchangepartnersinradiationinducedchromosomerearrangementsinprimaryhumanbronchialepithelialcellsandinasmallcelllungcancercellline AT arsuagaj relativeproximityofchromosometerritoriesinfluenceschromosomeexchangepartnersinradiationinducedchromosomerearrangementsinprimaryhumanbronchialepithelialcellsandinasmallcelllungcancercellline AT hillm relativeproximityofchromosometerritoriesinfluenceschromosomeexchangepartnersinradiationinducedchromosomerearrangementsinprimaryhumanbronchialepithelialcellsandinasmallcelllungcancercellline AT bridgerj relativeproximityofchromosometerritoriesinfluenceschromosomeexchangepartnersinradiationinducedchromosomerearrangementsinprimaryhumanbronchialepithelialcellsandinasmallcelllungcancercellline AT andersonr relativeproximityofchromosometerritoriesinfluenceschromosomeexchangepartnersinradiationinducedchromosomerearrangementsinprimaryhumanbronchialepithelialcellsandinasmallcelllungcancercellline |