1T3G, 4M9211141331461ENSG00000169306ENSMUSG00000052372Q9NZN1P59823NM_014271NM_001160403NP_055086n/aX-linked interleukin-1 receptor accessory protein-like 1, also known as IL-1R9, is a protein that in humans is encoded by the IL1RAPL1 gene.

It is most closely related to interleukin 1 receptor accessory protein-like 2 (IL1RAPL2).

[7] This gene and IL1RAPL2 are located at a region on chromosome X that is associated with X-linked non-syndromic mental retardation.

Deletions and mutations in this gene were found in patients with mental retardation.

This gene is expressed at a high level in post-natal brain structures involved in the hippocampal memory system, which suggests a specialized role in the physiological processes underlying memory and learning abilities.