family_id: PANTHER:PTHR33050
family_name: REVERSE TRANSCRIPTASE DOMAIN-CONTAINING PROTEIN
preferred_name: Reverse-transcriptase-containing proteins
summary: Reverse-transcriptase domains occur in different mobile-element and viral architectures. The
  retrieved reviewed entries emphasize hepadnaviral polymerases, which do not establish the life cycle
  or integration mechanism of a metazoan repeat-associated sequence.
functional_coherence: HETEROGENEOUS
coherence_reason: The mussel target contains a reverse-transcriptase domain, consistent with nucleic-acid
  engagement. DNA recombination and integration require additional machinery and cannot be inferred from
  reverse transcription alone. Distinguish hepadnavirus-like polymerase homology from a complete DIRS-like
  retroelement and verify companion domains before assigning an integration mechanism.
subfamilies:
- subfamily_id: PANTHER:PTHR33050:SF7
  label: RIBONUCLEASE H
  description: Recorded placement of A0A8B6BFL6. The mussel target contains a reverse-transcriptase domain,
    consistent with nucleic-acid engagement. DNA recombination and integration require additional machinery
    and cannot be inferred from reverse transcription alone. Distinguish hepadnavirus-like polymerase
    homology from a complete DIRS-like retroelement and verify companion domains before assigning an integration
    mechanism.
  representative_members:
  - id: UniProtKB:A0A8B6BFL6
    gene_symbol: A0A8B6BFL6
    organism: Mytilus galloprovincialis
    gene_review: genes/MYTGA/A0A8B6BFL6/A0A8B6BFL6-ai-review.yaml
term_assessments:
- assessed_term:
    id: GO:0003677
    label: DNA binding
  scope: UNRESOLVED
  scope_reason: Reverse-transcriptase architecture supports binding a nucleic-acid template/product during
    polymerization, but an isolated domain annotation does not establish catalytic integrity or DNA-binding
    competence of this mussel product. The DIRS study is an element-level comparison in Dictyostelium,
    not a direct assay of the selected protein. The complete functional architecture and family-wide binding
    boundary remain unresolved.
  supported_by:
  - reference_id: file:genes/MYTGA/A0A8B6BFL6/A0A8B6BFL6-uniprot.txt
    supporting_text: FT   DOMAIN          174..349
  - reference_id: file:genes/MYTGA/A0A8B6BFL6/A0A8B6BFL6-uniprot.txt
    supporting_text: FT                   /note="Reverse transcriptase"
- assessed_term:
    id: GO:0006310
    label: DNA recombination
  scope: UNRESOLVED
  scope_reason: DIRS elements encode a tyrosine-recombinase-based integration system, but reverse transcriptase
    alone does not carry out DNA recombination. The mussel product has a reverse-transcriptase domain
    without an established companion recombinase system. A mobile-element comparison therefore cannot
    supply this process to every family member or to the selected sequence.
  supported_by:
  - reference_id: PMID:32170321
    supporting_text: 'DIRS-1 produces a mixture of single-stranded, mostly linear

      extrachromosomal cDNA intermediates'
  - reference_id: file:genes/MYTGA/A0A8B6BFL6/A0A8B6BFL6-uniprot.txt
    supporting_text: FT   DOMAIN          174..349
  - reference_id: file:genes/MYTGA/A0A8B6BFL6/A0A8B6BFL6-uniprot.txt
    supporting_text: FT                   /note="Reverse transcriptase"
- assessed_term:
    id: GO:0015074
    label: DNA integration
  scope: UNRESOLVED
  scope_reason: The DIRS experiments demonstrate productive retrotransposition requiring the internal
    complementary region and element-encoded machinery. These are requirements of a complete element,
    not consequences of any reverse-transcriptase domain. The mussel target and the hepadnaviral-like
    comparison set have no shared demonstrated integration mechanism, leaving the relevant branch boundary
    unresolved.
  supported_by:
  - reference_id: PMID:32170321
    supporting_text: 'DIRS-1 produces a mixture of single-stranded, mostly linear

      extrachromosomal cDNA intermediates'
  - reference_id: file:genes/MYTGA/A0A8B6BFL6/A0A8B6BFL6-uniprot.txt
    supporting_text: FT   DOMAIN          174..349
  - reference_id: file:genes/MYTGA/A0A8B6BFL6/A0A8B6BFL6-uniprot.txt
    supporting_text: FT                   /note="Reverse transcriptase"
references:
- id: PMID:32170321
  title: DIRS retrotransposons amplify via linear, single-stranded cDNA intermediates.
- id: file:genes/MYTGA/A0A8B6BFL6/A0A8B6BFL6-uniprot.txt
- id: file:interpro/panther/PTHR33050/PTHR33050-entries.csv
review_status: COMPLETE
reviewed_by: codex
review_date: '2026-09-10'
notes: 'MYTGA/A0A8B6BFL6: requested accession A0A8B6BFL6; current record A0A8B6BFL6; sequence length 612;
  source cohort ARGO50. Family boundaries were assessed using the fetched member set and the cited domain,
  literature and analytical evidence. Gene-review verdicts and ARBA assertions are not independent validation.
  PANTHER subfamily labels and membership are recorded from the frozen UniProt records and panther.obo;
  they do not by themselves prove functional uniformity within a subfamily. PAINT rows were inspected
  as ancestral assertions, but node placement is not adjudicated without the relevant descendant tree/alignment.
  No residue requirement is encoded without a verified sequence-version anchor. A target-level refutation
  is not a family-wide NOT_APPLICABLE judgment. Exact protein-name-only predictions are treated as family-identification
  hypotheses rather than invented GO predictions.'