棕色旅鼠（Myopus schisticolor）XX和XY雌性个体的性腺发育与出生体重

Gonadal development and birth weight in XX and XY females of the wood lemming, Myopus schisticolor.

作者信息

Fredga K, Setterfield L, Mittwoch U

机构信息

Department of Conservation Biology and Genetics, EBC, Uppsala University, Uppsala, Sweden.

出版信息

Cytogenet Cell Genet. 2000;91(1-4):97-101. doi: 10.1159/000056826.

DOI:10.1159/000056826

PMID:11173838

Abstract

A quantitative histological analysis of ovaries from 8- to 10-day-old wood lemmings revealed significant differences between females with XY and XX sex chromosome constitutions. The ovarian volume of XY females was on average 57% of XX, and the number of oocytes was less than half in XY compared to XX. However, the frequency of growing oocytes in relation to the total number was 6.5% for XY compared to 3.0% for XX. Oogenesis in XY wood lemmings resembles in many respects that of mice heterozygous for certain translocations and with tertiary trisomy (Ts31H), and those with X0 monosomy. The fertility in XY wood lemmings is not reduced. On the contrary, XY females have a higher reproductive fitness than XX and XX. This is discussed in relation to the present findings. The body weight at birth was 8% higher in XY than in XX.

摘要

对8至10日龄木旅鼠的卵巢进行的定量组织学分析显示，具有XY和XX性染色体组成的雌性之间存在显著差异。XY雌性的卵巢体积平均为XX雌性的57%，与XX相比，XY中的卵母细胞数量不到一半。然而，与总数相关的生长中卵母细胞频率，XY为6.5%，而XX为3.0%。XY木旅鼠的卵子发生在许多方面类似于某些易位杂合子和三级三体（Ts31H）的小鼠，以及X0单体的小鼠。XY木旅鼠的生育能力并未降低。相反，XY雌性比XX和XX具有更高的繁殖适应性。结合当前研究结果对此进行了讨论。XY出生时的体重比XX高8%。