The Long Protostomic-type Cytoplasmic Intermediate Filament (cIF) Protein in Branchiostoma Supports the Phylogenetic Transition Between the Protostomic- and the Chordate-type CIFs

Overview

Journal Protoplasma

Publisher Springer

Specialty Biology

Date 2023 May 20

PMID 37209173

Authors

Anton Karabinos

Affiliations

Soon will be listed here.

Abstract

We identified 23 and 20 cytoplasmic IF (cIF) genes in the two Branchiostoma belcheri and Branchiostoma lanceolatum cephalochordates, respectively. Combining these results with earlier data on the related Branchiostoma floridae, the following conclusions can be drawn. First, the Branchiostoma N4 protein with a long lamin-like coil 1B segment is the only protostomic-type cIF found so far in any analysed chordate or vertebrate organism. Second, Branchiostoma is the only organism known so far containing both the long protostomic- and the short chordate-prototypes of cIFs. This finding provides so far missing molecular evidence for the phylogenetic transition between the protostomic- and the chordate-type IF sequences at the base of the cephalochordates and vertebrates. Third, this finding also brings some support for another hypothesis, that the long protostomic-type cIF is subjected to evolutionary constraints in order to preclude inappropriate interactions with lamin and that the latter complexes might be prevented by a several heptad-long rod deletion, which released the selective constraints on it and promoted, at least in part, its expansion in nematodes, cephalochordates, and in vertebrates. Finally, here-presented data confirmed our previous results that cephalochordates do not have any vertebrate type III or type IV IF homolog.

Citing Articles

Missing links exploring transitions.

Nick P Protoplasma. 2023; 260(6):1469-1471.

PMID: 37847394 PMC: 10590288. DOI: 10.1007/s00709-023-01902-1.

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