高压对象系统的压力测试(一):Y染色体架构约束与连续渐变的局限性—— 对MACSM 数学总纲 2.0核心判断的极端系统检验

阎, 子超; 阎, 小宁

doi:10.5281/zenodo.19847662

Published April 28, 2026 | Version 1.0

Preprint Open

高压对象系统的压力测试(一):Y染色体架构约束与连续渐变的局限性—— 对MACSM 数学总纲 2.0核心判断的极端系统检验

1. Independent Researcher

哺乳动物Y 染色体的雄性特异性区域(MSY)是一个高度重组隔离的遗传系统。经典群体遗传学基于穆勒棘轮等理论,对无重组区段的长期演化命运给出了明确预期:因有害突变不可逆累积,Y 染色体将走向持续功能退化直至消失。然而,以人类 T2T-CHM13-Y 为代表的高质量 Y 染色体完整组装揭示,其真实演化轨迹与该强版本预期存在系统性偏离:核心生殖基因库在约 8000 万年前完成筛选后即进入长期稳态;结构变异积累量已接近或超过均匀渐变模型在宽松设定下的上缘范围;演化事件呈现 “长期静止 — 短窗集中重塑”的时间簇集特征,而非沿时间轴均匀分布。

本文应用《MACSM 数学总纲 2.0》的参数框架,将连续渐变模型在该高压系统中的预期进行显式量化,并通过多维度数据对照与模型比较,检验了 MACSM 分层演化框架的解释力。结果显示,在核心架构层,多重约束(接口匹配瓶颈、适合度断崖、有限有效种群等)乘性叠加,使得零桥接点突变路径难以驱动架构级渐进改造;而参数层变异与短窗口耦合重塑可在不颠覆核心架构的前提下发生。Y 染色体由此构成 MACSM 核心判断的极端实证支撑:在重组受限、结构耦合强的封闭系统中,微进化机制的有效作用主要局限于参数层,显示出通过线性累积持续重塑架构层的能力有限。本研究同时为此类极端约束系统的检验方法提供了一个可复制的模板。

Abstract (English)

The male-specific region (MSY) of the mammalian Y chromosome is a highly recombination-isolated genetic system. Classical population genetics, based on Muller’s ratchet and related models, predicts that such a non-recombining region should undergo irreversible functional degradation over evolutionary time—the “Y-chromosome degeneration hypothesis.” However, recent high-quality complete Y-chromosome assemblies, including the human T2T-CHM13-Y, reveal systematic deviations from the strong version of this prediction. Core reproductive gene repertoires, established ~80 million years ago, have been maintained in a long-term steady state rather than undergoing continuous decay. Observed structural variant accumulation meets or exceeds the rough upper range estimated under highly permissive continuous gradualistic assumptions. Evolutionary events display a pattern of “long-term stasis punctuated by short bursts of concentrated remodeling,” rather than uniform change across time.

Using the parameterized framework of the MACSM Mathematical Framework 2.0, we explicitly quantify the predictions of the gradualistic model for this high-pressure system, and test them against comparative genomic, population genetic, and clinical data. Multiple lines of evidence, including selection-pressure analyses and qualitative model comparisons, indicate that a hierarchical model—in which core architecture is locked under strong constraints, while parameter-layer variations and episodic short-window transitions occur—fits the data substantially better than purely continuous gradual models. We attribute this to the multiplicative effects of interface compatibility bottlenecks, fitness landscape cliffs, and limited effective population size, which jointly compress the probability of incremental architectural remodeling. The Y chromosome thus provides extreme empirical support for the MACSM core thesis: under strong structural coupling and limited recombination, microevolutionary processes are predominantly confined to the parameter layer, showing limited capacity to systematically reshape core architecture through linear accumulation alone. This study also establishes a high-pressure system stress-testing methodology that can be extended to other contentious evolutionary systems.

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