Spectrin beta chain, non-erythrocytic 1

SPTBN1 encodes spectrin beta chain, non-erythrocytic 1 (fodrin), a large cytoskeletal protein involved in calcium-dependent membrane dynamics and essential for central nervous system development and function (UniProt: Q01082). The protein interacts with calmodulin in response to intracellular calcium, positioning it as a candidate regulator of cytoskeleton-membrane interactions critical for neuronal processes.

SPTBN1 is primarily relevant to neurological development. UniProt documents an association with developmental delay, impaired speech, and behavioral abnormalities (DDISBA, MIM 619475), an autosomal dominant condition characterized by intellectual disability, developmental delay, speech impairment, and autism-spectrum features, along with variable seizures, motor abnormalities, and hearing loss.

Regarding Alzheimer's Disease, SPTBN1 shows ambiguous directional change in human post-mortem AD brain versus age-matched controls across subcellular fractions (mean log2FC: −0.0511; Chaparral AD proteomics). The minimal fold-change and inconsistent direction across the three measured fractions suggest either subtle effects or fraction-dependent alterations in protein abundance or localization in AD pathology, warranting further investigation to clarify its role in disease mechanisms.