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Temporal organisation of hibernation in wild-type and tau mutant Syrian hamsters
The temporal pattern of hibernation was studied in three genotypes of Syrian hamsters with different circadian periodicity to assess a potential circadian control of alternating torpor and euthermy. We recorded the pattern of hibernation by measuring activity in continuous dim light and constant env...
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Published in: | Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology Biochemical, systemic, and environmental physiology, 2001-06, Vol.171 (5), p.431-439 |
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container_issue | 5 |
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container_title | Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology |
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creator | Oklejewicz, M Daan, S Strijkstra, A M |
description | The temporal pattern of hibernation was studied in three genotypes of Syrian hamsters with different circadian periodicity to assess a potential circadian control of alternating torpor and euthermy. We recorded the pattern of hibernation by measuring activity in continuous dim light and constant environmental temperature (6 +/- 1 degrees C). In spite of differences in the endogenous circadian period of three genotypes (tau +/+: approximately equals 24 h, tau +/-: approximately equals 22 h, and tau -/-: approximately equals 20 h) torpor bout duration was statistically indistinguishable (tau +/+: 86.9+/-5.3 h; tau +/-: 94.2+/-3.3 h; tau -/-: 88.8+/-6.2 h). The time between two consecutive arousals from torpor showed unimodal distributions not significantly different between genotypes. The first entry into torpor occurred within the active phase of the circadian cycle in all genotypes whereas the first arousal from torpor appeared to be timed randomly with respect to the prior circadian cycle. The amplitude of the activity rhythm was lower after hibernation compared with the amplitude before hibernation. The results suggest that in the Syrian hamster the circadian system does not control periodicity of torpor and arousal onsets in prolonged hibernation at 6 degrees C. |
doi_str_mv | 10.1007/s003600100193 |
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We recorded the pattern of hibernation by measuring activity in continuous dim light and constant environmental temperature (6 +/- 1 degrees C). In spite of differences in the endogenous circadian period of three genotypes (tau +/+: approximately equals 24 h, tau +/-: approximately equals 22 h, and tau -/-: approximately equals 20 h) torpor bout duration was statistically indistinguishable (tau +/+: 86.9+/-5.3 h; tau +/-: 94.2+/-3.3 h; tau -/-: 88.8+/-6.2 h). The time between two consecutive arousals from torpor showed unimodal distributions not significantly different between genotypes. The first entry into torpor occurred within the active phase of the circadian cycle in all genotypes whereas the first arousal from torpor appeared to be timed randomly with respect to the prior circadian cycle. The amplitude of the activity rhythm was lower after hibernation compared with the amplitude before hibernation. The results suggest that in the Syrian hamster the circadian system does not control periodicity of torpor and arousal onsets in prolonged hibernation at 6 degrees C.</description><identifier>ISSN: 0174-1578</identifier><identifier>EISSN: 1432-136X</identifier><identifier>DOI: 10.1007/s003600100193</identifier><identifier>PMID: 11497131</identifier><language>eng</language><publisher>Germany</publisher><subject>Animals ; Arousal ; Body Weight - physiology ; Circadian Rhythm - genetics ; Cricetinae ; Genotype ; Hibernation - physiology ; Male ; Mesocricetus - physiology ; Seasons ; tau Proteins - genetics</subject><ispartof>Journal of comparative physiology. 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B, Biochemical, systemic, and environmental physiology</title><addtitle>J Comp Physiol B</addtitle><description>The temporal pattern of hibernation was studied in three genotypes of Syrian hamsters with different circadian periodicity to assess a potential circadian control of alternating torpor and euthermy. We recorded the pattern of hibernation by measuring activity in continuous dim light and constant environmental temperature (6 +/- 1 degrees C). In spite of differences in the endogenous circadian period of three genotypes (tau +/+: approximately equals 24 h, tau +/-: approximately equals 22 h, and tau -/-: approximately equals 20 h) torpor bout duration was statistically indistinguishable (tau +/+: 86.9+/-5.3 h; tau +/-: 94.2+/-3.3 h; tau -/-: 88.8+/-6.2 h). The time between two consecutive arousals from torpor showed unimodal distributions not significantly different between genotypes. The first entry into torpor occurred within the active phase of the circadian cycle in all genotypes whereas the first arousal from torpor appeared to be timed randomly with respect to the prior circadian cycle. The amplitude of the activity rhythm was lower after hibernation compared with the amplitude before hibernation. The results suggest that in the Syrian hamster the circadian system does not control periodicity of torpor and arousal onsets in prolonged hibernation at 6 degrees C.</description><subject>Animals</subject><subject>Arousal</subject><subject>Body Weight - physiology</subject><subject>Circadian Rhythm - genetics</subject><subject>Cricetinae</subject><subject>Genotype</subject><subject>Hibernation - physiology</subject><subject>Male</subject><subject>Mesocricetus - physiology</subject><subject>Seasons</subject><subject>tau Proteins - genetics</subject><issn>0174-1578</issn><issn>1432-136X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><recordid>eNqFkM9LwzAYhoMobk6PXiUnb9V8TdOkRxF_wUDBCd7K1yZxkTadSYrsv3djA_Hk6Xs_eHjhfQg5B3YFjMnryBgvGdtkqPgBmULB8wx4-X5IpgxkkYGQakJOYvxkjBWgimMyASgqCRym5GVh-tUQsKND-EDvIiY3eDpYunSNCX73Ok-_XaeztF4Zil7ThCPtx4Q-0dd1cOjpEvuYTIin5MhiF83Z_s7I2_3d4vYxmz8_PN3ezLOW5yxlFhGlypXQWhvZiiavlEXBBEhhDOOmkEpwtG1jAHkOArS1ptK5KlWT65LPyOWudxWGr9HEVPcutqbr0JthjLUEJjcj1b8gSFXxotyC2Q5swxBjMLZeBddjWNfA6q3r-o_rDX-xLx6b3uhfei-X_wB0Fnoy</recordid><startdate>20010601</startdate><enddate>20010601</enddate><creator>Oklejewicz, M</creator><creator>Daan, S</creator><creator>Strijkstra, A M</creator><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7X8</scope></search><sort><creationdate>20010601</creationdate><title>Temporal organisation of hibernation in wild-type and tau mutant Syrian hamsters</title><author>Oklejewicz, M ; Daan, S ; Strijkstra, A M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c320t-faaa78285ddde7c5b298fa505175ee03e47853afcbe1a32151dffe9d2868b2d63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><topic>Animals</topic><topic>Arousal</topic><topic>Body Weight - physiology</topic><topic>Circadian Rhythm - genetics</topic><topic>Cricetinae</topic><topic>Genotype</topic><topic>Hibernation - physiology</topic><topic>Male</topic><topic>Mesocricetus - physiology</topic><topic>Seasons</topic><topic>tau Proteins - genetics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Oklejewicz, M</creatorcontrib><creatorcontrib>Daan, S</creatorcontrib><creatorcontrib>Strijkstra, A M</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of comparative physiology. 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We recorded the pattern of hibernation by measuring activity in continuous dim light and constant environmental temperature (6 +/- 1 degrees C). In spite of differences in the endogenous circadian period of three genotypes (tau +/+: approximately equals 24 h, tau +/-: approximately equals 22 h, and tau -/-: approximately equals 20 h) torpor bout duration was statistically indistinguishable (tau +/+: 86.9+/-5.3 h; tau +/-: 94.2+/-3.3 h; tau -/-: 88.8+/-6.2 h). The time between two consecutive arousals from torpor showed unimodal distributions not significantly different between genotypes. The first entry into torpor occurred within the active phase of the circadian cycle in all genotypes whereas the first arousal from torpor appeared to be timed randomly with respect to the prior circadian cycle. The amplitude of the activity rhythm was lower after hibernation compared with the amplitude before hibernation. 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source | Springer Nature |
subjects | Animals Arousal Body Weight - physiology Circadian Rhythm - genetics Cricetinae Genotype Hibernation - physiology Male Mesocricetus - physiology Seasons tau Proteins - genetics |
title | Temporal organisation of hibernation in wild-type and tau mutant Syrian hamsters |
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