19q133q134

19q13.3-q13.4 is a cytogenetic interval located on the long arm (q) of chromosome 19, defined by standard banding nomenclature. It denotes a specific region rather than a single gene and is used in reporting chromosomal findings and research.

The exact base-pair coordinates of this interval depend on the genome assembly (for example GRCh38/hg38). The region lies within the q13 portion of chromosome 19 and is part of a broad, gene-rich neighborhood that contains multiple protein-coding genes and regulatory elements. The gene content and boundaries of the interval can vary across assemblies and annotations.

Clinically, variants affecting 19q13.3-q13.4, such as microdeletions or microduplications, have been reported in some individuals with developmental delay, intellectual disability, congenital anomalies, or neuropsychiatric features. However, phenotypic outcomes associated with changes in this region are variable, and no single causative gene has been established for all cases. The interpretation of rearrangements in this interval often depends on the size of the rearrangement and the specific genes involved.

Testing and research approaches used to study this region include array comparative genomic hybridization (aCGH) or SNP-based copy-number analysis, which can detect dosage changes, as well as whole-genome or targeted sequencing. Fluorescence in situ hybridization (FISH) may be used for confirmatory testing in some clinical settings. Ongoing research aims to clarify which genes within 19q13.3-q13.4 contribute to observed phenotypes and how variations in this interval interact with broader genomic context.