QTL analyses of temporal and intensity components of home-cage activity in KJR and C57BL/6J strains

Juzoh Umemori, Akinori Nishi, Arimantas Lionikas, Takayuki Sakaguchi, Satoshi Kuriki, David A Blizard, Tsuyoshi Koide

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Abstract

BACKGROUND: A variety of mouse strains exhibit diversity in spontaneous activity consistent with an important genetic contribution. To date, many studies have defined spontaneous home-cage activity as total distance or total counts of activity within a test period. However, spontaneous activity is, in fact, a composite of elements of 'temporal' and 'intensity' that is similar to 'velocity'. Here, we report on quantitative trait loci for different components of spontaneous activity, an important step towards dissection of the underlying genetic mechanisms. RESULTS: In the analysis of total home-cage activity (THA) after habituation in female mice, KJR strain exhibit higher activity than C57BL/6J (B6). In this study, THA was partitioned into two components: active time (AT) was an index of the 'temporal element' of THA, average activity during active time (AA) was an index of 'intensity'. Correlation analysis using B6xKJR F2 female mice indicated that AA is a major component of THA, whereas AA and AT were associated to a lesser degree. To explore the genetic basis of the activity differences, we conducted quantitative trait loci (QTL) analysis on data of THA and its components, AT and AA. Three significant QTL affecting variation of different components of home cage activity were identified, two linked QTL Hylaq1 and Hylaq2 on Chr 2, and Hylaq3 on Chr 10. Chromosomal positions of these QTL were previously implicated in locomotor activity (Chr 2) or open-field ambulation (Chr 10). The results indicated that Hylaq1 influences AT, Hylaq2, AA, while Hylaq3 is associated with both AA and AT. CONCLUSION: Through this study, we found that variation in total home cage activity over a 3 day period is affected by variation in active time and intensity of activity. The latter two variables are distinct components of home cage activity with only partially overlapping genetic architecture.
Original languageEnglish
Article number40
Number of pages11
JournalBMC Genetics
Volume10
DOIs
Publication statusPublished - 29 Jul 2009

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Quantitative Trait Loci
Locomotion
Walking
Dissection

Keywords

  • animals
  • chromosome mapping
  • crystallization
  • female
  • genotype
  • mice
  • mice, inbred C57BL
  • microsatellite repeats
  • motor activity
  • quantitative trait loci
  • sequence analysis, DNA

Cite this

QTL analyses of temporal and intensity components of home-cage activity in KJR and C57BL/6J strains. / Umemori, Juzoh; Nishi, Akinori; Lionikas, Arimantas; Sakaguchi, Takayuki; Kuriki, Satoshi; Blizard, David A; Koide, Tsuyoshi.

In: BMC Genetics, Vol. 10, 40, 29.07.2009.

Research output: Contribution to journalArticle

Umemori, Juzoh ; Nishi, Akinori ; Lionikas, Arimantas ; Sakaguchi, Takayuki ; Kuriki, Satoshi ; Blizard, David A ; Koide, Tsuyoshi. / QTL analyses of temporal and intensity components of home-cage activity in KJR and C57BL/6J strains. In: BMC Genetics. 2009 ; Vol. 10.
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abstract = "BACKGROUND: A variety of mouse strains exhibit diversity in spontaneous activity consistent with an important genetic contribution. To date, many studies have defined spontaneous home-cage activity as total distance or total counts of activity within a test period. However, spontaneous activity is, in fact, a composite of elements of 'temporal' and 'intensity' that is similar to 'velocity'. Here, we report on quantitative trait loci for different components of spontaneous activity, an important step towards dissection of the underlying genetic mechanisms. RESULTS: In the analysis of total home-cage activity (THA) after habituation in female mice, KJR strain exhibit higher activity than C57BL/6J (B6). In this study, THA was partitioned into two components: active time (AT) was an index of the 'temporal element' of THA, average activity during active time (AA) was an index of 'intensity'. Correlation analysis using B6xKJR F2 female mice indicated that AA is a major component of THA, whereas AA and AT were associated to a lesser degree. To explore the genetic basis of the activity differences, we conducted quantitative trait loci (QTL) analysis on data of THA and its components, AT and AA. Three significant QTL affecting variation of different components of home cage activity were identified, two linked QTL Hylaq1 and Hylaq2 on Chr 2, and Hylaq3 on Chr 10. Chromosomal positions of these QTL were previously implicated in locomotor activity (Chr 2) or open-field ambulation (Chr 10). The results indicated that Hylaq1 influences AT, Hylaq2, AA, while Hylaq3 is associated with both AA and AT. CONCLUSION: Through this study, we found that variation in total home cage activity over a 3 day period is affected by variation in active time and intensity of activity. The latter two variables are distinct components of home cage activity with only partially overlapping genetic architecture.",
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T1 - QTL analyses of temporal and intensity components of home-cage activity in KJR and C57BL/6J strains

AU - Umemori, Juzoh

AU - Nishi, Akinori

AU - Lionikas, Arimantas

AU - Sakaguchi, Takayuki

AU - Kuriki, Satoshi

AU - Blizard, David A

AU - Koide, Tsuyoshi

PY - 2009/7/29

Y1 - 2009/7/29

N2 - BACKGROUND: A variety of mouse strains exhibit diversity in spontaneous activity consistent with an important genetic contribution. To date, many studies have defined spontaneous home-cage activity as total distance or total counts of activity within a test period. However, spontaneous activity is, in fact, a composite of elements of 'temporal' and 'intensity' that is similar to 'velocity'. Here, we report on quantitative trait loci for different components of spontaneous activity, an important step towards dissection of the underlying genetic mechanisms. RESULTS: In the analysis of total home-cage activity (THA) after habituation in female mice, KJR strain exhibit higher activity than C57BL/6J (B6). In this study, THA was partitioned into two components: active time (AT) was an index of the 'temporal element' of THA, average activity during active time (AA) was an index of 'intensity'. Correlation analysis using B6xKJR F2 female mice indicated that AA is a major component of THA, whereas AA and AT were associated to a lesser degree. To explore the genetic basis of the activity differences, we conducted quantitative trait loci (QTL) analysis on data of THA and its components, AT and AA. Three significant QTL affecting variation of different components of home cage activity were identified, two linked QTL Hylaq1 and Hylaq2 on Chr 2, and Hylaq3 on Chr 10. Chromosomal positions of these QTL were previously implicated in locomotor activity (Chr 2) or open-field ambulation (Chr 10). The results indicated that Hylaq1 influences AT, Hylaq2, AA, while Hylaq3 is associated with both AA and AT. CONCLUSION: Through this study, we found that variation in total home cage activity over a 3 day period is affected by variation in active time and intensity of activity. The latter two variables are distinct components of home cage activity with only partially overlapping genetic architecture.

AB - BACKGROUND: A variety of mouse strains exhibit diversity in spontaneous activity consistent with an important genetic contribution. To date, many studies have defined spontaneous home-cage activity as total distance or total counts of activity within a test period. However, spontaneous activity is, in fact, a composite of elements of 'temporal' and 'intensity' that is similar to 'velocity'. Here, we report on quantitative trait loci for different components of spontaneous activity, an important step towards dissection of the underlying genetic mechanisms. RESULTS: In the analysis of total home-cage activity (THA) after habituation in female mice, KJR strain exhibit higher activity than C57BL/6J (B6). In this study, THA was partitioned into two components: active time (AT) was an index of the 'temporal element' of THA, average activity during active time (AA) was an index of 'intensity'. Correlation analysis using B6xKJR F2 female mice indicated that AA is a major component of THA, whereas AA and AT were associated to a lesser degree. To explore the genetic basis of the activity differences, we conducted quantitative trait loci (QTL) analysis on data of THA and its components, AT and AA. Three significant QTL affecting variation of different components of home cage activity were identified, two linked QTL Hylaq1 and Hylaq2 on Chr 2, and Hylaq3 on Chr 10. Chromosomal positions of these QTL were previously implicated in locomotor activity (Chr 2) or open-field ambulation (Chr 10). The results indicated that Hylaq1 influences AT, Hylaq2, AA, while Hylaq3 is associated with both AA and AT. CONCLUSION: Through this study, we found that variation in total home cage activity over a 3 day period is affected by variation in active time and intensity of activity. The latter two variables are distinct components of home cage activity with only partially overlapping genetic architecture.

KW - animals

KW - chromosome mapping

KW - crystallization

KW - female

KW - genotype

KW - mice

KW - mice, inbred C57BL

KW - microsatellite repeats

KW - motor activity

KW - quantitative trait loci

KW - sequence analysis, DNA

U2 - 10.1186/1471-2156-10-40

DO - 10.1186/1471-2156-10-40

M3 - Article

C2 - 19638241

VL - 10

JO - BMC Genetics

JF - BMC Genetics

SN - 1471-2156

M1 - 40

ER -