Positioning of chromosomes in human spermatozoa is determined by ordered centromere arrangement.

Positioning of chromosomes in human spermatozoa is determined by ordered centromere arrangement.
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DOI:
10.1371/journal.pone.0052944
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Zalensky AO
Zalensky AO
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mudrak OS;Nazarov IB;Jones EL;Zalensky AO

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染色体的核内定位(CHRs)是一个有据可查的事实,然而,指导这种排序的机制仍不清楚。与体细胞不同,人类精子含有独特的空间标记,并且具有不对称的细胞核,这使得它们成为定位染色体区域和匹配着丝粒周围结构域的独特模型。在这项研究中,我们建立了8个CHR的统计学上的纵向和横向定位。这两个参数表明,相关性与基因密度,但不与它们的大小。发现CHRs的核内非随机定位是由连续阵列中物理互连的着丝粒的特定线性顺序驱动的。在二倍体精子中,在两个基因组组中,着丝粒周的线性顺序是相同的,并且基本上与为单倍体细胞建立的排列相匹配。我们建议,在人类精子中的非随机纵向顺序的CHRs在精子发生的减数分裂阶段产生。精子CHR的特殊排列可能是胚胎早期差异转录/复制和直接空间组织的表观遗传基础。
The intranuclear positioning of chromosomes (CHRs) is a well-documented fact; however, mechanisms directing such ordering remain unclear. Unlike somatic cells, human spermatozoa contain distinct spatial markers and have asymmetric nuclei which make them a unique model for localizing CHR territories and matching peri-centromere domains. In this study, we established statistically preferential longitudinal and lateral positioning for eight CHRs. Both parameters demonstrated a correlation with the CHR gene densities but not with their sizes. Intranuclear non-random positioning of the CHRs was found to be driven by a specific linear order of centromeres physically interconnected in continuous arrays. In diploid spermatozoa, linear order of peri-centromeres was identical in two genome sets and essentially matched the arrangement established for haploid cells. We propose that the non-random longitudinal order of CHRs in human spermatozoa is generated during meiotic stages of spermatogenesis. The specific arrangement of sperm CHRs may serve as an epigenetic basis for differential transcription/replication and direct spatial CHR organization during early embryogenesis.
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