Scientists trace the DNA changes that made tomatoes bigger
Topcu Y, Adak A, Kayikci HC, Aydin S, Yildiz K
Crop Improvement
The plump tomato on your sandwich exists because ancient farmers, and now scientists, kept selecting for a handful of DNA tweaks on one chromosome, and this study shows breeders exactly which ones to target next.
Researchers compared wild pea-sized tomato relatives to today's plump grocery-store tomatoes to figure out which genes control fruit size. They found a small number of DNA changes, especially a cluster on chromosome 5, that got selected for as humans domesticated and improved the crop, and these changes explain over 90% of the size differences between plants. This gives breeders a precise genetic toolkit to grow bigger, more consistent tomatoes without relying on years of trial-and-error crossing.
Key Findings
Genome-wide association analysis identified 15 SNP, 10 INDEL, and 10 SV loci linked to fruit weight, several overlapping known genes like fw2.2/CNR and fw3.2/KLUH.
A 390-bp deletion on chromosome 5 (at position 45,551,023) was linked to fruit weight in all four tested environments, marking it as a stable domestication-related target.
Genotype explained over 92% of the variation in fruit weight, with Partial Least Squares and Bayesian regression models predicting fruit size more accurately than Random Forest or Deep Learning approaches.
chevron_right Technical Summary
Scientists mapped the genes controlling tomato fruit size by comparing wild ancestors to modern varieties, pinpointing a handful of DNA changes on chromosome 5 that breeders selected for during domestication. This genetic roadmap could speed up breeding bigger, more reliable tomatoes across different climates.
Abstract Preview
Original paper
Multi-variant GWAS and genomic prediction dissect the genetic architecture underlying tomato fruit weight.
Tomato fruit weight is primarily controlled by stable genetic effects and domestication-/improvement-associated loci, including prominent chromosome 5 signals, and integrating SNP, INDEL, and SV di...
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