Huntington Disease Pedigree Chart

Huntington disease pedigree.

This simple pedigree shows an autosomal dominant pattern using Huntington disease as the clinical example. An affected parent has an affected child in the next generation, while unaffected relatives are also shown so the family structure is easy to read. The affected granddaughter is the proband, the person whose history brought the family to clinical attention. This is the kind of compact drawing used early in a consultation or in genetics teaching, before dates, test reports and additional relatives are added. A pedigree shows reported family history and relationships; it cannot determine whether a person has inherited a variant. Genetic testing and medical decisions should be discussed with a qualified clinician or counselor.

Tipo Diagrama de linhagemNorma NSGC Pedigree Standardization (Bennett 2008)Mecanismo schematex-pedigreeAtualizado 24/09/2026

A solicitação

“A Huntington disease pedigree: an affected father and unaffected mother have an affected daughter and an unaffected son; the affected daughter and an unaffected partner have an affected daughter who is the proband and an unaffected son.”

Depois, tenteAdd age of onset below the affected relatives.Mark the affected daughter in generation two as deceased.

O que há neste desenho

Entenda as decisões por trás dele.

01Successive generations

Affected relatives appear in each generation.

02Unaffected partners

Partners are shown as unaffected.

03Index case

The affected granddaughter is the proband.

Use this simple chart to introduce autosomal dominant inheritance in a counseling or teaching conversation.

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Perguntas frequentes

Dúvidas comuns

What is autosomal dominant inheritance?

A disease-associated variant on a non-sex chromosome can be sufficient to cause the condition.

Why are unaffected relatives included?

They show the family structure and help make the inheritance pattern easier to interpret.

What does the arrow identify?

It marks the proband, the person who prompted the clinical evaluation.