Are V30M and p.Val50Met the Same Genetic Mutation?

Yes, V30M and p.Val50Met are the exact same genetic mutation ^[1]. If your genetic report says you have the p.Val50Met mutation, you have what the amyloidosis community traditionally calls V30M ^[2]. The difference is simply in how scientists and genetic laboratories count the building blocks (amino acids) of the protein ^[3].

Why Are There Two Different Names?

The transthyretin (TTR) protein is made up of a chain of amino acids. To pinpoint exactly where a mutation occurs, scientists number these amino acids in order.

• V30M (The Historical Name): In the past, scientists started counting amino acids beginning with the “mature” part of the protein that circulates in the blood ^[4]. When counted this way, the mutation occurs at position 30, where the amino acid valine (V) is replaced by methionine (M) ^[5]. This is why the variant has historically been called V30M.
• p.Val50Met (The Standardized Name): Today, genetic testing labs use a strict international standard for naming mutations, known as HGVS nomenclature ^[3]. This modern standard requires counting from the very beginning of the protein, including a 20-amino-acid “signal peptide” (a temporary sequence that helps guide the protein in the cell before being removed) ^[4]. Because they include these 20 extra amino acids at the start, position 30 becomes position 50 (30 + 20 = 50) ^[5]. The “p.” simply stands for “protein,” while “Val” and “Met” are the three-letter abbreviations for valine and methionine.

Note: This +20 naming rule applies to all TTR mutations. For example, the variant traditionally called V122I will appear on modern lab reports as p.Val142Ile.

What This Means For You

Because V30M was discovered decades ago, almost all older research, support groups, and patient communities use the name V30M ^[5]. However, official laboratory reports and newer medical records use p.Val50Met to ensure accuracy and consistency across all genetic testing ^[3].

Rest assured, whether your doctor calls it V30M or your lab report reads p.Val50Met, they are talking about the exact same genetic variant, and the exact same medical care and treatment options apply ^[2]. You can safely use the wealth of information available on V30M to understand your p.Val50Met test result ^[1].

Search Tip: When looking for research, clinical trials, or patient support online, try using both “V30M” and “p.Val50Met” as search terms to ensure you find all available resources.