Conservation and Variability of Synaptonemal Complex Proteins in Phylogenesis of Eukaryotes

Table 4

SC proteins with similarities to proteins from the proteomes of unicellular eukaryotes.

Eukaryotic taxa	Total proteins in the NCBI database^a	Proteins of the SC central space		Lateral element proteins and other SC proteins
		1	2	3	4
		From animals	From plants and fungi	From plants and fungi	From animals
Parabasalia + Fornicata ++ Heterolobosea (primitive unicellular eukaryotes)	174018	Low similarity	ZYP1a At (50)	ASY2 At (107),; ASY1 At (194),; Hop1 Sc (104),; Hop1 annotated for Giardia  intestinalis; and Hop1-like, for Trichomonas  vaginalis	HIM-3 Ce (55),; SYCP2 Mm (51)
Apicomplexa (sporozoans of the group Alveolata)	241035	SYP-1 Ce (57),; SYCP1 Mm  (67)c	ZYP1b At (59),; ZYP1a At  (60)c	ASY2 At (107),; ASY1 At (148),; Hop1 Sc (99)	FKBP6 Mm (133)
Ciliophora (infusoria, Alveolata)	144165	SYCP1 Dr (60)	ZYP1b At (51)	Low similarity	FKBP6 Mm (114)
Euglenozoa (euglenic protozoans)	187312	SYCP1 Mm (56)	Low similarity	ASY2 At (91),; ASY1 At (115),; Hop1 Sc (94)	HIM-3 Ce (52),; FKBP6 Mm (78)
Choanoflagellata	30401	C(3)G Dm (57),; SYCP1 Mm (65)	ZYP1a At (52),; ZYP1b At (61),; Zip1 Sc (52)	ASY1 At (78),; Hop1 Sc (56)	SYCP2 Mm (53), FKBP6 Mm (76)

aAs of the time of study (November 2011–November 2012).
^cThese scores (with 𝐸-value = 5𝑒⁻⁰⁸) approximate the scores obtained for the random analogs of the SC proteins (𝐸-value = 5𝑒⁻⁰⁴) (italicized).
Other designations are as in Table 3.