The genetic makeup of girls determines at which age they
Scientists from UK's Institute of Cancer Research (ICR)
studied about 26,000 women to determine whether menarche tends to run in the
families or it is influenced by environmental factors. Every participant had at
least one relative who was also a part of the study. Eventually it was ruled
out that the age when a woman had her first periods was linked with her
relatives. In 57% cases genetic predisposition was found to be a major factor
which determined the age of menarche.
The findings of the study indicate that genetic factors
have major influence on the age British women begin menstruating and this could
also have an impact on risk of breast cancer. This study will be published in
the May edition of Pediatric and Perinatal Epidemiology.