PUBLICATION

Half-tetrad analysis in zebrafish: mapping the ros mutation and the centromere of linkage group I

Authors
Johnson, S.L., Africa, D., Horne, S., and Postlethwait, J.H.
ID
ZDB-PUB-961014-495
Date
1995
Source
Genetics   139: 1727-1737 (Journal)
Registered Authors
Horne-Badovinac, Sally, Johnson, Stephen L., Postlethwait, John H.
Keywords
none
MeSH Terms
  • Animals
  • Centromere*
  • Chromosome Mapping
  • Genetic Linkage*
  • Genetic Markers
  • Mutation*
  • Polymorphism, Genetic
  • Zebrafish/genetics*
PubMed
7789773 Full text @ Genetics
Abstract
Analysis of meiotic tetrads is routinely used to determine genetic linkage in various fungi. Here we apply tetrad analysis to the study of genetic linkage in a vertebrate. The half- tetrad genotypes of gynogenetic diploid zebrafish produced by early-pressure (EP) treatment were used to investigate the linkage relationships of two recessive pigment pattern mutations, leopard (leo) and rose (ros). The results showed that ros is tightly linked to its centromere and leo maps 31 cM from its centromere. Analysis of half-tetrads segregating for ros and leo in repulsion revealed no homozygous ros individuals among 32 homozygous leo half-tetrads--i.e., a parental ditype (PD) to nonparental ditype (NPD) ratio of 32:0. This result shows that ros is linked to leo, a mutation previously mapped to Linkage Group I. Investigation of PCR- based DNA polymorphisms on Linkage Group I confirmed the location of ros near the centromere of this linkage group. We propose an efficient, generally useful method to assign new mutations to a linkage group in zebrafish by determining which of 25 polymerase chain reaction (PCR)-based centromere markers shows a significant excess of PD to NPD in half-tetrad fish.
Genes / Markers
Figures
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping