A new mutation in the timing of autogamy in Paramecium tetraurelia.

Abstract:

:We have isolated a new type of Paramecium tetraurelia mutant, named rie-2, that has a long immaturity period until autogamy. We previously isolated such an autogamy mutant, designated rie-1. These two mutants had some additional common features such as dependence of the occurrence of autogamy on the temperature, involvement of a single recessive gene, lower fission rate and shorter clonal life span. However, rie-2 was considered a new type mutant distinguishable from rie-1 because of their different natures of temperature sensitivity. First, the temperature at which they resembled the wild-type phenotype was low (19 degrees C) in rie-2, although it was high (32 degrees C) in rie-1. Second, the clonal life span of rie-2 at 25 degrees C was similar to that of the wild-type, but it was extremely shorter at 32 degrees C than at 25 degrees C, although it was similarly shorter at both temperatures in rie-1. Third, the difference of the fission rate between mutant and wild-type was greater at 32 degrees C than at 25 degrees C in rie-2, although it was similar at both temperatures in rie-1. This report shows that a gene mutation to elongate the period until sexual maturation does not necessarily assure the long life span.

journal_name

Mech Ageing Dev

authors

Komori R,Sato H,Harumoto T,Takagi Y

doi

10.1016/j.mad.2005.01.010

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

752-9

issue

6-7

eissn

0047-6374

issn

1872-6216

pii

S0047-6374(05)00043-6

journal_volume

126

pub_type

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