CHIA基因编码几丁质酶酸性（Chitinase Acidic），也称为几丁质酶1（Chitinase 1），属于几丁质酶家族（Chitinase family）。几丁质酶是一类能够分解几丁质（一种存在于真菌细胞壁、昆虫外骨骼和寄生虫外壳中的多糖）的酶。CHIA主要在巨噬细胞和上皮细胞中表达，其生物学功能包括参与先天免疫防御，帮助清除真菌和寄生虫感染，并在炎症反应和组织重塑中发挥作用。CHIA的作用位点主要是细胞外基质和感染部位，通过降解几丁质来破坏病原体的结构。CHIA基因突变可能导致酶活性降低或丧失，从而削弱机体对真菌和寄生虫的防御能力，增加感染风险。此外，CHIA与某些疾病相关，如哮喘、慢性阻塞性肺病（COPD）和炎症性肠病（IBD），因为其表达水平的变化可能影响炎症反应的调控。CHIA过表达可能增强对病原体的清除能力，但也可能加剧炎症反应，导致组织损伤；而降低表达则可能增加感染风险并影响组织修复。CHIA属于几丁质酶家族，该家族的共性是通过水解几丁质参与免疫防御和病原体清除。家族成员通常具有保守的催化结构域，但不同成员在组织分布和功能上有所差异。CHIA的活性受多种因素调节，包括细胞因子（如干扰素-γ）和病原体相关分子模式（PAMPs）。在疾病治疗中，CHIA可能成为抗感染或抗炎药物的靶点，但其具体应用仍需进一步研究。

由该基因编码的蛋白质降解几丁质，这是在大多数真菌的细胞壁，以及在节肢动物和某些线虫找到。所编码的蛋白质也可以刺激白细胞介素13的表达，并且在该基因变异会导致哮喘易感性。已发现该基因编码几个不同的亚型几个抄本变形。 [由RefSeq的，2012年4月提供]

The CHIA gene, also designated as Chitinase Acidic or Chitinase 1, encodes a member of the chitinase family, a group of enzymes characterized by their ability to hydrolyze chitin, a structural polysaccharide prevalent in the cell walls of fungi, the exoskeletons of insects, and the integuments of certain parasites. Expressed predominantly in macrophages and epithelial cells, CHIA plays a pivotal role in innate immune defense by localizing to the extracellular matrix and infection sites, where it degrades chitinous components of pathogens to compromise their structural integrity and facilitate their clearance. The enzymatic activity of CHIA is tightly regulated by various immunological stimuli, including cytokines such as interferon-gamma and pathogen-associated molecular patterns (PAMPs), allowing it to adapt its function during inflammatory responses and tissue remodeling. While this activity is essential for protecting the host against fungal and parasitic infections, dysregulation of CHIA expression is implicated in several chronic inflammatory conditions, including asthma, chronic obstructive pulmonary disease (COPD), and inflammatory bowel disease (IBD). Specifically, mutations that reduce or abolish enzyme activity can impair the body's defensive capacity against pathogens, increasing susceptibility to infection, whereas overexpression, although potentially enhancing pathogen clearance, may exacerbate inflammatory cascades and lead to collateral tissue damage. Consequently, CHIA represents a potential therapeutic target for modulating immune responses in both infectious and inflammatory diseases, although its precise clinical application remains an area of ongoing investigation.

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