Finding: the conserved region supports DYNLT2B-family identity, but this accession is not a straightforward full-length counterpart of the human light chain. All ten functional/localization predictions remain unresolved for the exact protein model.
The reproducible comparison aligns 128 residues at 91.41% identity, covering 90.14% of human Q8WW35 and 52.24% of horse A0A9L0SWY1. A large N-terminal extension accompanies loss of human residues 129–142. The missing region includes most of the terminal beta-strand observed in the human DYNLT1–DYNLT2B heterodimer, PDB8RGI. PMID:38454149(https://pubmed.ncbi.nlm.nih.gov/38454149/)
Structure and tethering mechanism of dynein-2 intermediate chains in intraflagellar transport.
The observed human structure makes this more than an arbitrary percentage-identity concern. However, no folding, stability or binding experiment has established the effect of this exact horse alteration. A gene-model or translation discrepancy is plausible; an evolved horse-specific loss of function is not demonstrated. The sequence submitted to ProtNLM at prediction time is also unknown.
Human knockout and interaction studies strongly support the ordinary DYNLT2B role in retrograde IFT. The horse uncertainty should not be read as evidence against that conserved gene-family function. Human ciliary-base and MTOC localization, tagged-protein axonemal signal, and mouse sperm axonemal biology are separate observations with different transfer limits. PMID:25830415(https://pubmed.ncbi.nlm.nih.gov/25830415/), PMID:29742051(https://pubmed.ncbi.nlm.nih.gov/29742051/), PMID:39827215(https://pubmed.ncbi.nlm.nih.gov/39827215/)
The human evidence synthesis and source-specific limits are recorded in the human notes and Falcon report. No horse-specific functional paper or reviewed horse record was identified for this accession, so the paired human research and protein-model analysis were used instead of an additional horse Edison request.