زنجیره سبک فریتین (انگلیسی : Ferritin light chain پروتئین است که در انسان توسط ژن «FTL » کُدگذاری می‌شود.[ ۳] [ ۴] [ ۵]
این پروتئین به‌طور غیرطبیعی طی فرایندهای «آی‌وی‌اف (IVF) » و «تزریق درون‌سیتوپلاسمی اسپرم » بیان می‌شود و احتمالاً یکی از دلایل بروز بیماری مادرزادی در جنین‌هایی است که توسط فناوری کمک‌باروری بدنیا می‌آیند.[ ۶]
نقص در ژن زنجیره سبک فریتین با بروز چندین نوع بیماری تخریب‌کنندهٔ اعصاب مرتبط است که یکی از آنها «سندرم هایپرفریتینمی -آب‌مروارید » است.[ ۷]
همچنین جهش در این ژن سبب بروز نوع نادری از بیماری هستهٔ قاعده‌ای مغز در بالغین موسوم به «نوروفریتینوپاتی» می‌گردد.[ ۸]
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