Relationship between mitochondrial haplogroup and seasonal changes of physiological responses to cold

Journal of Physiological Anthropology

Shigeki Watanuki²  Takayuki Nishimura¹ 

[1] Department of Public Health, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan;Department of Human Science, Faculty of Design, Kyushu University, Fukuoka, Japan

关键词: Seasonal acclimatization;    Cold exposure;    VO₂;    NST;    mtDNA haplogroup;   

Others  :  1133124
DOI  :  10.1186/1880-6805-33-27

 received in 2014-02-19, accepted in 2014-08-13,  发布年份 2014

【 摘 要 】

Background

Physiological responses to cold exhibit individual variation that can be affected by various factors, such as morphological characteristics, seasonal changes, and lifestyle; however, the genetic factors associated with this variation remain unclear. Recent studies have identified mtDNA as a potential genetic factor affecting cold adaptation. In addition, non-shivering thermogenesis (NST), a process closely related to mitochondrial dynamics, has also been suggested as an important factor affecting human response to cold. The present study aimed to clarify the relationship between mitochondrial haplogroup and NST during periods of mild cold exposure.

Methods

Seventeen healthy university students (D: n = 8, non-D: n = 9) participated in the present study during summer and winter. A climate chamber was programmed so that ambient temperature inside dropped from 28°C to 16°C over the course of an 80-minute period. Physiological parameters were recorded throughout the course of the experiments.

Results

Increases in VO₂ were significantly greater during periods of cold exposure in winter than they were during periods of cold exposure in summer, and individuals from the D group exhibited greater winter values of ΔVO₂ than individuals from the non-D group.

T_re was significantly lower during periods of rest and cold exposure in winter; however, no significant difference was observed between T_re values of individuals in the D and non-D groups. In addition, althoughView MathML"> was significantly lower during periods of rest in winter than it was during those same periods in summer, no significant seasonal differences in values ofView MathML"> were observed during periods of cold exposure.

Conclusions

Results of the present study indicated that NST was greater in winter, and that the D group exhibited greater NST than the non-D group during winter. Despite the differences between groups in NST, no significant differences in rectal and skin temperatures were found between groups in either season. Therefore, it was supposed that mitochondrial DNA haplogroups had a greater effect on variation in energy expenditure involving NST than they had on insulative responses. Future studies are necessary in order to investigate more multiple candidate genes related to human cold adaptation and to elucidate the relationship between gene polymorphism and physiological polytypism.

【 授权许可】

   
2014 Nishimura and Watanuki; licensee BioMed Central Ltd.

【 图 表 】

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