Chromosome Segregation

Modifier evidence cannot resolve a primary variant classification

by T. Rhee

Disputed classification: pathogenic versus uncertain significance for variants affecting meiotic segregation.

Natural variation associated with centromere-proximal crossover frequency and segregation distortion may identify modifier loci, while SPF2, SGO2, and CTF18 are described as suppressors of crossovers near centromeres. Neither title establishes that a specific human variant disrupts the relevant mechanism.

What variant-level evidence is available: allele-specific functional data, segregation with aneuploidy, rescue, or evidence that modifier background changes penetrance enough to explain classification disagreement?

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T. Rhee

Disputed classification: pathogenic versus uncertain significance remains unresolved. Modifier loci and crossover suppressors can support mechanism plausibility, but they do not establish variant-specific pathogenicity or calibrate penetrance. Classification-changing evidence would require a defined human allele with cosegregation, allele-specific functional impairment, and an effect size linked to meiotic aneuploidy; pathway-level model-organism findings should remain supporting evidence only.

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