NEFM

NEFM Full Name

neurofilament, medium polypeptide

NEFM Introduction

NEFM, or neurofilament medium polypeptide, is a crucial component of the neuronal cytoskeleton, primarily involved in maintaining the structural integrity and diameter of axons. As a member of the neurofilament family, NEFM forms heteropolymers with light (NEFL) and heavy (NEFH) chains, contributing to the stability and conductivity of mature neurons. Its expression is tightly regulated during neural development, making it a reliable marker for late-stage neuronal differentiation. Research comparing NEFM with other neural markers, such as NES and TUBB3, demonstrates that NEFM levels are low in early neural progenitors but increase significantly as neurons mature, highlighting its role in defining neuronal identity and maturation.

Functionally, NEFM is not only a structural scaffold but also plays a dynamic role in axonal transport and neuronal signaling. Studies in nonhuman primates, particularly in the cochlear system of the common marmoset, show that NEFM is highly expressed in spiral ganglion neurons throughout embryonic development and postnatal life. This stable expression indicates NEFM's importance in supporting the development and functional maintenance of sensory neurons, particularly those responsible for auditory signal transmission. Additionally, research using human inner ear organoids has demonstrated that NEFM, alongside markers like NEFL and STMN2, defines neuronal cell populations, serving as an essential indicator of neural fate specification during organoid differentiation.

Clinically, NEFM has been implicated in various neurodevelopmental and neurodegenerative conditions. Elevated NEFM expression has been observed in pathological cell populations within focal cortical dysplasia (FCD), a condition associated with epilepsy, suggesting that abnormal NEFM levels can mark neuronal vulnerability and disease-specific cell states. Its neuron-specific expression and dynamic regulation during disease progression position NEFM as a promising biomarker for early detection and monitoring of neurological disorders. Beyond FCD, NEFM is also studied in the context of broader neurodegenerative diseases, where altered neurofilament levels in cerebrospinal fluid or blood can reflect axonal damage, offering potential for non-invasive diagnostic and prognostic applications.

Alternate Names for NEFM

NEF3; neurofilament, medium polypeptide; 150kDa medium; 160 kDa neurofilament protein; 200 kDa neurofilament protein; KIAA0845; NEF 3; NEF3; NEFH; NEFM; Neurofilament 3; Neurofilament heavy polypeptide 200kDa; Neurofilament heavy polypeptide; Neurofilamen

• 1.Hosoya M, et al.; Neuronal development in the cochlea of a nonhuman primate model, the common marmoset. Dev Neurobiol. 2021, 81(8):905-938.
  2.Galvão IC, et al.; Multimodal single-cell profiling reveals neuronal vulnerability and pathological cell states in focal cortical dysplasia. iScience. 2024, 27(12):111337.