GNB2 evidence notes

Private scientific review, 2026-11-07

All 72 incoming contexts were reviewed manually. The exporter produces 71 rows because it collapses an extension distinction. Both original exosome records remain separate; raw 69 retains its unresolved extension. All five incoming extensions are restored without creating NEW annotations.

The generic binding removals address functional specificity. The literal positive interaction evidence remains in the evidence JSON and its source-specific assay assessments. Association, proximity and functional regulation are distinguished.

No new process annotation is proposed. Client participation in the Reactome folding events is kept separate from the chaperones' catalytic activities. The current GO-CAM index had no exact P62879 match at the intake cutoff; no exhaustive isoform-model claim is made.

The two annotated splice products lack separate incoming assignments.

The source guide and evidence JSON record assay, donor, product and access limits. This private stage precedes normal missing-only acquisition, genuine history generation, validation and rendering. Actual native results must be appended after execution.

Native preparation completed, 2026-11-07

The genuine repository fetch returned 72 raw contexts and seeded 71 rows. The reviewed output preserves all 72 original contexts and five extensions, together with both genuine product declarations. Nine missing normal publications were acquired; all 41 existing source files stayed unchanged. All 39 publication titles and three supporting excerpts were checked against the normal caches. The fetched full-text flag for PMID:26900580 was reconciled without altering its scientific assessment.

Target validation and strict GOA matching passed. The family cross-check at base 2f72fda covered 951 materialized family reviews with zero conflicts; unrelated unresolved diagnostics remain. The computed status is DRAFT because the exosome contexts retain one consistency advisory: the distinct cell extension stays UNDECIDED while other contexts remain KEEP_AS_NON_CORE.

Biological synthesis and source boundaries, 2026-11-07

Human Gβ2 was cloned as a 340-residue protein with repeated sequence elements PMID:3108879.

The reviewed canonical product contains seven WD repeats, consistent with the Gβ propeller architecture [UniProt:P62879; Reactome:R-HSA-6814120].

Gβγ is the mature signaling unit. Mammalian Gβ folding and Gγ association depend on the N-terminal coiled-coil region PMID:11238401. That paper directly studies atypical fission-yeast Git5; its organism-specific architecture is not assigned to human Gβ2.

The receptor-triggered cycle involves nucleotide exchange and effector regulation PMID:31300275. Gα performs hydrolysis PMID:19255495.

β2/γ2 experiments connect altered GIRK regulation to familial conduction disease PMID:28219978.

Reactome places Gβ2 inside CCT/PDCL-assisted assembly intermediates; CCT supplies ATP-dependent folding, while Gβ2 is the client [Reactome:R-HSA-6814120; Reactome:R-HSA-6814121]. These contextual locations do not assign chaperone activity to Gβ2.

The first Gly77Arg case linked GNB2 to developmental delay PMID:31698099. An independent Gly77Trp case strengthened that association PMID:33971351. The subsequent cohort reported recurrent variants near the Gα interface PMID:34183358. Its proposed interface weakening came from modeling, not a directly measured shared mechanism. These findings support disease association without establishing which developmental steps Gβ2 itself performs; no NEW developmental process follows from phenotype alone.

Native follow-up completed, 2026-11-07

Target validation, strict GOA matching and the 951-family cross-check passed. The source-defect export includes the proposed upstream check, with reporting status NOT_REPORTED. The computed status remains DRAFT because the legacy validator reports two context-dependent action differences. Its exception mechanism does not cover these warnings; the attempted stale exception was removed without changing the scientific decisions.

Second review follow-up, 2026-11-07

The second follow-up changes two review actions and the source-defect category, adds retained-record corroboration and a source locator, and preserves all 72 incoming contexts. Target validation, strict GOA matching, source-defect export and the 951-family cross-check passed. The exported extension request uses OTHER and remains NOT_REPORTED. Computed status remains DRAFT with one legacy exosome action-consistency advisory; the source uncertainty is preserved.