These include the clinically similar Ataxia telangiectasia (AT), AT like disease (ATLD), Nijmegen Breakage Syndrome (NBS) and NBS like disorder (NBSLD), caused by mutations in the ATM, MRE11, NBS1 and RAD50 genes respectively (4–6). Here, MRE11 is linked to Nijmegen breakage syndrome-like disorder.