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Rainbow CNV model requirements

Written by Support

Reference cohort selection

Cohort size requirements

Assay Type

Recommended Number of Samples

Minimal Number of Samples*

WES / Large gene panel

30-60

20

Small gene panel (<1 mb)**

50-100

30

Somatic gene panel

50-100

30

Somatic gene panel + backbone

50-100

30

WGS

30-60

15

WGS + Homology genes haplotyping

30-60

20

WGS - Lowpass

30-60

20

* Using fewer than the recommended samples may reduce model quality and increase calling artifacts

** Small gene panels require the sample list file to include each reference sample's sex, particularly when the panel omits sex chromosome genes.

Reference samples selection criteria

  1. Standardize sample preparation - all reference samples must use the same capture kit (for WES and panels), library preparation protocol, and sequencing platform. All future samples run against this model must follow the same protocol.

  2. Biological Diversity:

    1. Samples should come from individuals free of known large chromosomal abnormalities

    2. Avoid enrichment for specific diseases or genetic syndromes

    3. Ideally, samples must be unrelated

    4. Balanced distribution of sample sex (unless the sequencing panel does not include sex chromosomes)

  3. High-quality samples - exclude low- or uneven-coverage samples.

  4. Multiple sample batch - Use samples from multiple preparation batches and sequencing runs to minimize batch bias.

Model configurations

Parameter

Assay Type

Options

Default

Description

Gene Scope

Somatic

True/False

False

When True, caps the size of called CNVs to a single gene. Use for panels with widely spaced covered regions (non-backbone kits)

Max Deletion CN

Somatic

0.1-1.9

≤ 1.0

Maximum copy-number threshold for a valid somatic deletion

Min Duplication CN

Somatic

2.1-10

≥ 2.8

Minimum copy-number threshold for a valid somatic duplication

WGS Homology Haplotyping

WGS

True/False

False

Homology haplotype calling for SMN and HBA

Mosaic Calling

WGS

True/False

True

Enable mosaic variant calling

Mosaic Level

WGS

0.2-0.8

0.4

Mosaic detection sensitivity threshold. At 0.4, only variants with CN ≥ 2.4 or CN ≤ 1.6 are called.

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