Srp72, a component of the signal recognition particle (SRP) complex, is crucial for targeting proteins to the endoplasmic reticulum, a key process in co-translational protein targeting and membrane protein insertion [2,3]. SRP72 forms a heterodimer with SRP68, and together they bind to a regulatory site of the SRP RNA [3]. Understanding its function is essential for uncovering the molecular mechanisms of protein translocation and related cellular processes. Mouse models can provide valuable insights into its in-vivo functions.

A study developed an Srp72 null mouse model to investigate its role in the hematopoietic system. Heterozygous loss of Srp72 in mice led to mild reductions in blood and bone marrow cellularity and minor changes within the stem/progenitor compartment, with no observed hematological disorder. Gene expression analysis showed that genes encoding secreted factors were transcriptionally down-regulated in Srp72+/- animals. However, this mouse model only partially recapitulated the phenotype seen in families with inherited SRP72 lesions [1].

In conclusion, Srp72 is essential for protein targeting to the endoplasmic reticulum. The Srp72 null mouse model has provided some understanding of its role in the hematopoietic system. In humans, germline mutations in SRP72 are associated with myelodysplasia and bone marrow aplasia, highlighting its significance in certain hematological diseases [1,4].