In situ hybridization suggests TRIM37 expression patterns in multiple tissues during mouse and human embryogenesis. No Trim37 expression is detected up to E9.5. At E11.5, Trim37 expression is detected in cells lining the esophagus and bronchias well as the innermost cells of the optic cup adjacent to the lens. Between E12.5 and E14.5, TRIM37 is detected in different parts of ganglia and throughout liver. Intense expression is seen in gut epithelium of the midgut, stomach, esophagus and in the primitive seminiferous tubules of the developing testis at E14.5. Expression is also evident in the olfactory epithelium, epithelial lining of the bronchioles, surface ectoderm and in the developing eye lens epithelium, neural layer of the retina (but not in the optic nerve), epithelium of developing nephron, mesonephric duct, and epithelial pancreas cells. Similar to the E14.5 mouse, in 7 week old human embryos, TRIM37 expression can be detected in similar tissues including dorsal root ganglia, liver, submandibular gland and epithelial lining of the gut lumen. At 10 weeks, intense TRIM37 expression can be detected in dorsal root and trigeminal ganglia, epithelia in multiple tissues and liver. However, no TRIM37 transcript can be detected in migrating neural crest cells.

In another study, TaqMan PCR results suggest expression of TRIM37a and TRIM37b to be the highest in testis. In the brain, TRIM37a expression is 15-fold higher in adult and 20-fold higher in fetal tissue compared to the expression in heart as a reference. The lowest TRIM37a expression is detected in skeletal muscle with 0.3 and 0.8 times the expression of heart in adult and in fetal tissues.

In post-pubertal testis, a stage-specific cytoplasmic Trim37 staining of germ cells can be detected. Developing sperm from type B spermatogonia to early round spermatids show immunoreactivity. In post-pubertal ovary, intense Trim37 staining is observed in maturing oocytes as well as in the granulosa cells, luteal gland, and in the epithelium of the fallopian tubes.

2. c.2212delG : This "Finminor" mutation is a 1-bp deletion of a G at nucleotide c.2212 and results in a frameshift that predicts a stop codon 30 codons downstream. Finminor is found to be associated with a distinct haplotype that is found in 2 of 100 Finnish MUL chromosomes. This mutation is predicted to generate a truncated 767 aa protein. Two patients were found to be compound heterozygotes for the Finmajor and Finminor mutations.

3. c.838delACTTT : This homozygous "Czech" mutation found in a Czech patient is a 5-bp deletion of ACTTT at nucleotides c.838_842 leading to a frameshift that results in a stop codon 55 codons downstream. This mutation is predicted to generate a truncated 334 aa protein.

4. c.134insA : this "American" mutation is a homozygous 1-bp insertion of an A nucleotide after c.1346 in an American patient. The mutation disrupts the reading frame and results in a stop codon eight codons downstream. This mutation is predicted to generate a truncated 334 aa protein.

5. c.855_862delTGAATTAG : This mutation detected in a Turkish family is an 8-bp deletion. On the genomic level, aberrant splicing was implicated due to a transition at the splice acceptor (AG) at position c.855 1G>A. A cryptic splice site (AG, c.860) 8-bp downstream is activated, which leads to disruption of the open reading frame (ORF) through a premature stop codon (PTC, TGA) at position c.1045 1047 that translates into a truncated protein.

6. c.745C>T : This mutation detected in a Canadian patient is predicted to generate a truncated 249 aa protein.

7. c.965G>T : This mutation detected in a Canadian patient is predicted to generate a missense amino acid at the 322th position (Gly322Val).

8. c.1037_1040dupAGAT : This mutation detected in a Canadian patient is a four base-pair duplication in exon 13. It is predicted to generate a frame-shift at amino acid position 347, and truncation of the protein product after seven code-shifted amino acids.

9. c.1411C>T : This mutation detected in Tunusian-German and Canadian patients is predicted to generate a truncated 471 aa protein.

10. c.1314+507_1668-207del : This mutation detected in a Sicilian patient is predicted to generate a genomic deletion of 8603 bp with break points in introns 14 and 16 (c.1314+507_1668-207del), thus deleting exons 15 and 16. At the protein level this mutation leads to a frame-shift at 439th aa and truncation of the protein product after four code-shifted amino acids.

11. c.2056C>T : This mutation detected in a Saudi-Arabian patient is predicted to generate a truncated 686 aa protein.