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# %% [markdown]
# # Workflow B — A rare *TB1/FC1* high-effect variant and tiller number
#
# **19K-RGP cross-platform example workflow.** The paper highlights a rare *TB1/FC1* promoter
# variant that strengthens an *OsBZR1* binding motif and is associated with increased tiller number
# (≈38 carrier accessions, 0.95% frequency). This workflow shows how a user would locate carriers,
# quantify the allele's group/geographic distribution, and estimate its phenotypic association with
# an explicit confidence interval — the kind of *rare-variant prioritization* the reviewers asked for.
#
# Runs in Colab or the project Docker image. Live steps fall back to precomputed tables.

# %%
import sys, os
sys.path.insert(0, os.path.dirname(os.path.abspath("oryza19k.py")) or ".")
import numpy as np, pandas as pd
import oryza19k as o19

# %% [markdown]
# ## Step 1 — Locate *TB1/FC1* (Ensembl REST)
# OsTB1 (TEOSINTE BRANCHED1) / FINE CULM1 (FC1). `lookup_gene` tries the gene id then the symbol.

# %%
try:
    gene = o19.lookup_gene("Os03g0706500")           # OsTB1 / FC1
    chrom, start, end = gene["seq_region_name"], gene["start"], gene["end"]
    print(f"{gene.get('display_name','TB1')}  chr{chrom}:{start:,}-{end:,}")
except Exception as e:
    chrom, start, end = "3", None, None
    print(f"Resolve OsTB1 via GrameneOryza/Ensembl ({type(e).__name__}); proceeding with chr3.")

# %% [markdown]
# ## Step 2 — Genotype the promoter site across the panel & get allele frequency
# Efficient path: stream the single site with `tabix` (no full download). Offline, we read the
# precomputed per-group allele-frequency table for the locus.

# %%
af_locus = None
try:
    af = o19.summary_table("allele_freq_by_group")
    if start:
        ck = f"Chr{int(chrom):02d}" if str(chrom).isdigit() else str(chrom)
        af_locus = af[(af["chrom"] == ck) & af["pos"].between(start - 2000, end + 2000)]
    print("Core SNPs in/around the locus (per-group allele frequencies):")
    print((af_locus if af_locus is not None else af).head(8).to_string(index=False))
except Exception as e:
    print(f"Precomputed allele-frequency table not available ({type(e).__name__}).")
    print("Expected: a rare promoter allele carried by ~38 accessions (~0.95% global frequency).")

# %% [markdown]
# ## Step 3 — Confirm the regulatory consequence (Ensembl VEP + the high-effect-variant table)
# The variant is predicted to strengthen an *OsBZR1* binding motif (a high-effect regulatory
# variant, HEV). Its HEV annotation lives in the precomputed `hev_table` (Note 10 §10.6).

# %%
try:
    hev = o19.summary_table("hev_table")               # exported by the KAUST team
    print(hev[hev.get("gene", "").astype(str).str.contains("TB1|FC1", case=False, na=False)].head())
except Exception as e:
    print(f"HEV table is part of the Zenodo deposit ({type(e).__name__}); the paper reports this "
          "variant modulates an OsBZR1 motif (Extended Data Fig. 3).")

# %% [markdown]
# ## Step 4 — Effect size on tiller number, with a confidence interval & confounding check
# Join carriers to tiller-number phenotype, varietal group, and geography; report the effect with a
# 95% CI and check that it is not driven by relatedness/geography among the few carriers.

# %%
# Illustrative analysis once carrier genotypes + the tiller phenotype table are joined:
def rare_allele_effect(pheno_carrier, pheno_noncarrier):
    a, b = np.asarray(pheno_carrier, float), np.asarray(pheno_noncarrier, float)
    diff = a.mean() - b.mean()
    se = np.sqrt(a.var(ddof=1) / len(a) + b.var(ddof=1) / len(b))
    return diff, (diff - 1.96 * se, diff + 1.96 * se)

print("rare_allele_effect(carriers, non-carriers) -> (mean difference, 95% CI).")
print("With ~38 carriers, always report the CI and confirm the carriers are not a single clade or")
print("locale (use accession_passport: varietal group + lat/lon) before interpreting the effect.")

# %% [markdown]
# **Result.** A reproducible recipe to go from a named high-effect variant to its carriers, its
# group/geographic distribution, and a CI-bounded phenotypic association — with the small-n caveat
# made explicit, as the reviewers requested.
