129S1/SvImJ mouse

Nomenclature:129S1/SvImJ

Type: Inbred

Origin: 129S1/SvImJ was developed to serve as a control inbred strain for many of the steel-derived ES cell lines (e.g. W9.5 and CJ7). SSLP marker analysis indicates that 129S1/SvImJ is identical to 129S1/Sv +^Oca2-p +^Tyr-c Kitl^Sl-J/+ except for the region surrounding the Kitl gene on Chr 10. 129S1/SvImJ was derived from 129S1/Sv-+^Oca2-p +^Tyr-c Kitl^Sl-J/+ (Stock No. 000090). The steel-Jackson mutation (Kitl^Sl-J, formerly Mgf^Sl-J), is segregating in Stock No. 000090. Kitl^Sl-J was removed in 1995, at F26, by selective breeding to produce 129/Sv-+^Oca2-p +^Tyr-c +^Kitl-SlJ (Stock No. 002448, see Simpson et al., 1997). This name was later shortened to simply 129/SvImJ. Subsequently designated 129S3/SvImJ (Festing et al., 1999), this strain was renamed 129S1/SvImJ in February, 2001 to emphasize its relationship to Stock No. 000090.

Detailed description: Historically, the 129 inbred mice are known for the high incidence of spontaneous testicular teratomas, though the incidence differs between substrains (1-3% in 129 parental substrains; 30% in teratoma substrains.) More recently, 129 mice are widely used in the production of targeted mutations due to the availability of multiple embryonic stem cell lines derived from them. There is major genetic variation within the 129 "family", which has led to an update of the nomenclature and a division of the substrains into three major groups: parental substrains (129P), steel substrains (129S) and "teratoma" substrains (129T). Investigators using 129 substrains for targeted mutagenesis should be careful in the selection of the appropriate 129 substrain to match the embryonic stem cell line. For a complete history of the numerous 129 substrains, see Simpson, et al., 1997.

In 2019-2020, researchers at The Jackson Laboratory discovered this inbred strain contains the Trem2^S148E allele - a naturally occurring variant at position 48351151-48351152 on Chr 17 (rs108080490 and rs107649577; Ensembl GRCm38.p6). This TC to GA transition results in a serine to glutamic acid substitution at amino acid 148 (S148E).

JAX™ Stock No: 002448

More information about the strain: 

• Festing Inbred Strain Characteristics: 129
• Mouse Phenome Database
• Mouse Phenome Database / SNP Facility
• National Center for Biotechnology Information / SNP Data

Note: Only The Jackson Laboratory and Charles River in Europe and Japan maintain colonies of JAX™ Mice strains which are derived from pedigreed mice from The Jackson Laboratory and are re-infused routinely with pedigreed mice to stabilise the genetic integrity and phenotype of these strains.

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