🧬 DNA Sequence Analyzer

A lightweight Python tool to analyze DNA sequences — directly from a file or user input — and get insights like base composition, GC content, transcription, translation, and reverse complement.

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🚀 Features

• ✅ DNA Validation – Ensures the input contains only valid bases: A, T, G, C
• 🔢 Base Counting – Counts total occurrences and percentage of each nucleotide
• 🧪 GC Content Calculation – Measures GC richness of the sequence
• 🔁 Reverse Complement – Generates the reverse complement strand
• 🔬 Transcription – Converts DNA to RNA by replacing T with U
• 🧬 Translation – Translates DNA into a protein sequence using a codon table

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📦 Requirements

• Python 3.x
  (No external libraries required)

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📁 Input Options

You can analyze DNA from:

1. A text file (.txt)
   Format: Plain sequence (A/T/G/C only), optionally multiline

2. Manual input
   Just paste your DNA sequence when prompted

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🛠️ How It Works

Run the script: python dna_analyzer.py

Then follow the interactive prompt: 📂 Do you have a file? (yes/no): yes 📝 Enter your DNA file path or name (.txt): my_sequence.txt

Sample output: ✅ DNA is valid!

🧾 Base Count: {'A': 22, 'T': 20, 'G': 18, 'C': 15} 📊 Base Percentage: {'A': '29.33%', 'T': '26.67%', 'G': '24.00%', 'C': '20.00%'}

🧪 GC Content: 44.0%

🔁 RNA Sequence: AUGCGUUAAG...

🧬 Protein Sequence: Met-Arg-Stop...

🧬 Reverse Complement: TTACGCTA...

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