Recommended reading
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Centriolar precursors that precede the formation of the centriole microtubule
The mechanisms that initiate centriole formation and assure that only a single daughter centriole is formed near the mother centriole is still a mystery. A major difficulty in approaching this question is the capacity to observe the events that take place when the daughter centriole nucleation site is forming and to be able to manipulate the process. There are only a few studies that analyzed centriole duplication that have been able to see centriolar precursors before any of the microtubules of the centriole wall are formed (this later is referred to as procentriole). These studies in Paramecium (Dippell, 1968), the marine protist Labyrinthula (Perkins, 1970) and Rhesus monkey (Anderson, 1971), established a conserved structural pathway using electron microscopy of chemically fixed preparations. More recently similar observations were made in C. elegance using high pressure freezing and electron tomography (Pelletier, 2006).
Dippell RV. The development of basal bodies in paramecium. Proc Natl Acad Sci U S A. 1968 Oct;61(2):461-8. No abstract available. PMID: 4176480.
Anderson RG, Brenner RM. The formation of basal bodies (centrioles) in the Rhesus monkey oviduct. J Cell Biol. 1971 Jul;50(1):10-34. PMID: 4998200
Pelletier L, O'Toole E, Schwager A, Hyman AA, Müller-Reichert T. Centriole assembly in Caenorhabditis elegans. Nature. 2006 Nov 30;444(7119):619-23. PMID: 17136092