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Genetics and Family History

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Abstract

This chapter describes principles of genetics and family history that are relevant to the practice of clinical endocrinology. It begins with a review of historical eras that provides context for how two seemingly distinct specialties have become intricately interwoven. Genetics concepts are then explained in a progression from basic to complex, each section building on the previous, with clinical examples included to help readers develop a comprehensive understanding without becoming overwhelmed. Topics covered include DNA and RNA structure and function, the genetic code, transcription, translation, exons, introns, gene expression, gene locus, alleles, genotype, phenotype, Mendelian and non-Mendelian patterns of inheritance, epigenetics, gene mutations, chromosomal structural and copy number abnormalities, and cytogenetic and molecular genetic testing methodologies and interpretation.

The Mendelian inheritance section outlines the three laws of Mendelian inheritance and associated inheritance patterns including homozygous and heterozygous, autosomal and pseudoautosomal, dominant and recessive. Non-Mendelian patterns of inheritance described include co-dominance, linkage, sex-linked, multiple alleles, complex polygenic or multifactorial, and mitochondrial.

Gene mutations discussed include point, missense, nonsense, insertion, deletion, duplication, frameshift, substitution, and repeat expansions. Chromosomal abnormalities described include translocations, deletions, duplications, inversions, isochromosomes, dicentric, ring, and aneuploidies resulting from meiotic and mitotic nondisjunction.

The genetic testing section covers karyotyping, fluorescent in situ hybridization, microarrays, gene expression analysis, direct sequencing analysis, and methylation analysis. The section on family history provides information about publicly available tools for collecting genetic and endocrine history data, as well as a detailed description of how to create and use pedigrees to aid in clinical decision-making and communication with patients and their families.

The chapter concludes with a practical discussion of nursing implications, a recommended reading section, and an extensive list of supplemental educational materials and resources. Supplemental materials include a genetics glossary, a list of online resources for information on genetics concepts introduced within the chapter, a list of genetics-based peer-reviewed journals, a list of professional organizations and societies for nurses interested in genetics, and a list of current textbooks on genetics.

The recommended reading section contains a list of online and print publications providing additional in-depth information on genetics in human endocrinology, nursing competencies in genetics, using analogies in patient education, legal and ethical implications of genetics in the clinical setting, issues surrounding disclosure of genetic diagnoses, clinical case studies, interactive pedigree software, epigenetics, molecular genetics testing, gene therapy, additional internet genetics resources, and the future of genetics in endocrinology.

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Notes

  1. 1.

    Key terms definitions were derived from National Human Genome Research Institute (2014).

Abbreviations

2n:

Diploid

3′:

3-prime

3-M:

Syndrome causing short stature, unusual facial features, and skeletal abnormalities first identified by researchers named Miller, McKusick, and Malvaux

5′:

5-prime

A:

Adenine

aCGH:

Array comparative genomic hybridization

ACTH:

Adrenocorticotropic hormone

AR:

Androgen receptor

arr:

Array

bp:

Base pairs

BWS:

Beckwith–Wiedemann syndrome

C:

Cytosine

CAG:

Cytosine-adenine-guanine nucleotide sequence

CDKN1B:

Cyclin dependent kinase inhibitor 1B

cDNA:

Complementary DNA

CGH:

Comparative genomic hybridization

CH3:

Methyl group

CH3CO:

Acetyl group

CNV:

Copy number variants or copy number variations

CpG:

Cytosine-phosphate-guanine (cytosine and guanine separated by a phosphate)

CYP212A :

Cytochrome P450 family 21 subfamily A member 2

del or dn:

Deletion

der:

Derivative chromosome

dp:

Duplication

DNA:

Deoxyribonucleic acid

FGD:

Familial glucocorticoid deficiency

FGFR3 :

Fibroblast growth factor receptor 3

FISH:

Fluorescent in situ hybridization

FMR1 :

Fragile X mental retardation 1

G:

Guanine

GEM:

Gene expression microarray

GH:

Growth hormone

GNAS :

Guanine nucleotide-binding protein alpha subunit or g-protein alpha subunit

HDSNP-array:

High-density single nucleotide polymorphism array

i:

Isochromosome

ins:

Insertion

inv:

Inversion

kb:

Kilobase pairs

mat:

Maternally derived chromosome

Mb:

Megabase pairs

MEN1 :

Multiple endocrine neoplasia type 1 or menin 1

MEN4:

Multiple endocrine neoplasia type 4

MIDD:

Maternally inherited diabetes and deafness or mitochondrial diabetes and deafness

miRNA:

MicroRNAs

MODY5:

Maturity-onset diabetes of the young type 5

mRNA:

Messenger RNA

mtDNA:

Mitochondrial DNA

n:

Haploid

NGS:

Next-generation sequencing

p:

Short arm of a chromosome

PCOS:

Polycystic ovarian syndrome

PCR:

Polymerase chain reaction

PHEX :

Phosphate regulating endopeptidase homolog X-linked

PTPN11 :

Protein tyrosine phosphatase, non-receptor type 11

q:

Long arm of a chromosome

RCAD:

Renal cysts and diabetes syndrome

RNA:

Ribonucleic acid

rRNA:

Ribosomal RNA

SHOX :

Short stature homeobox

SNP:

Single nucleotide polymorphism

SNP-array:

Single nucleotide polymorphism array

SOS1 :

Son of sevenless homolog 1 or SOS Ras/Rac guanine nucleotide exchange factor 1

SOX3 :

SRY-box 3 or SRY-related HMG-box 3 (Sex-determining region Y-related high-mobility-group box transcription factor 3)

SRY :

Sex-determining region Y

T:

Thymine

t:

Translocation

tRNA:

Transfer RNA

TSH:

Thyroid stimulating hormone

U:

Uracil

VHL :

Von Hippel-Lindau

WES:

Whole-exome sequencing

WGS:

Whole-genome sequencing

wt:

Wild type allele

Xce :

X chromosome controlling element

Xic:

X-inactivation center

Xist :

X inactive specific transcript

References

Key Reading

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Behm, K.M. (2019). Genetics and Family History. In: Llahana, S., Follin, C., Yedinak, C., Grossman, A. (eds) Advanced Practice in Endocrinology Nursing. Springer, Cham. https://doi.org/10.1007/978-3-319-99817-6_7

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  • DOI: https://doi.org/10.1007/978-3-319-99817-6_7

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