Enhancing Data Compression: Recent Innovations in LZ77 Algorithms

The burgeoning volume of genomic data, fueled by advances in sequencing technologies, demands efficient data compression solutions. Traditional algorithms like Lempel-Ziv77 (LZ77) have been foundational in offering lossless compression, yet they often fall short when applied to the highly repetitive structures typical of genomic sequences. This review delves into the evolution of LZ77 and its derivatives, exploring specialized algorithms such as prefix-free parsing, AVL grammars, and LZ-based methods tailored for genomic data. Innovations in this field have led to enhanced compression ratios and processing efficiencies by leveraging the intrinsic redundancy within genomic datasets. We critically examine a spectrum of LZ77-based algorithms, including newer adaptations for external and semi-external memory settings, and contrast their efficacy in managing large-scale genomic data. Additionally, we discuss the potential of these algorithms to facilitate the construction of data structures such as compressed suffix trees, crucial for genomic analyses. This paper aims to provide a comprehensive guide on the current landscape and future directions of data compression technologies, equipping researchers and practitioners with insights to tackle the escalating data challenges in genomics and beyond.