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Table 1 Dominantly inherited neurodegenerative diseases are associated with abnormally expanded tracts of glutamine residues.

From: COPASAAR – A database for proteomic analysis of single amino acid repeats

Disease protein

Gln repeats

Other notable repeats/comments

Huntington's disease protein

1 SAAR (23-residues)

2x Pro repeats (11-and 10-residues)

2x Glu repeats (6-and 5-residues)

Spinocerebellar ataxin type 1

2 SAARs (15-and 12-residues)

The two Gln repeats are separated by 4 residues

Androgen receptor (Kennedy's disease)

3 SAARs (21-, 6-and 5-residues)

1x Pro repeat (8-residues)

1x Ala repeat (5-residues)

1x Gly repeat (24-residues)

  1. Legend: These SAARs are often accompanied by at least 2 other long SAARs of different amino acids. Gln – Glutamine, Pro – Proline, Ala – Alanine, Gly – Glycine, Glu – Glutamic acid.