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The human lens fiber-cell intrinsic membrane protein MP19 gene: isolation and sequence analysis
1Emory University School of Medicine, Department of Ophthalmology, Atlanta, GA 30322.
Abstract:
DNA sequence analysis of overlapping shotgun and restriction fragments have revealed the entire sequence of the human lens fiber cell intrinsic membrane protein MP19 gene (also termed MP17, MP18, and MP20). The 8,056 bp MP19 gene contains 5 exons encoding a mature protein of 173 amino acids, which displayed a very high degree of identity (91%) with that of bovine MP19, deduced from a bovine cDNA sequence. The exon range in size from 52 bases (exon 1) to about 340 bases (exon 5). The introns consist of two large segments (introns B and C) of about 4,700 bases and 1,800 bases, respectively, and two small segments (intron A and D) of about 450 and 250 bases each. Seven Alu family DNA repeats are found within the human MP19 gene. The sequenced gene includes 100 bases of 5' flanking sequence.
Insights
Researchers sequenced the human lens fiber cell intrinsic membrane protein MP19 gene. This gene contains five exons and shows high identity to its bovine counterpart, offering insights into eye lens development.
Area of Science:
- Genomics
- Molecular Biology
- Ophthalmology
Background:
- The human lens fiber cell intrinsic membrane protein MP19 gene plays a role in eye lens structure and function.
- Understanding the genetic makeup of MP19 is crucial for insights into lens development and potential associated disorders.
Purpose of the Study:
- To determine the complete DNA sequence of the human MP19 gene.
- To analyze the gene's structure, including exons, introns, and regulatory regions.
Main Methods:
- DNA sequencing using overlapping shotgun and restriction fragment analysis.
- Bioinformatic analysis to identify gene structure and sequence homology.
Main Results:
- The entire 8,056 bp human MP19 gene sequence was elucidated, comprising 5 exons and encoding a 173-amino acid protein.
- High sequence identity (91%) was observed between human and bovine MP19 proteins.
- The gene contains introns of varying sizes and seven Alu family DNA repeats, with 100 bases of 5' flanking sequence identified.
Conclusions:
- The detailed sequence and structural analysis of the human MP19 gene provide a foundational resource for further research.
- The high conservation with the bovine ortholog suggests functional importance of the MP19 protein in lens physiology across species.