This document discusses various topics in human genetics including:
1. It defines human genetics as the scientific study of human variation and heredity, and medical genetics as the study of the hereditary nature of human disease.
2. Genetic diseases can be caused by inherited mutations, chromosomal abnormalities, or mutations in somatic cells (cancer). Inherited diseases can be due to nuclear or mitochondrial genetic mutations.
3. Examples of inherited genetic disorders and their inheritance patterns are discussed, including autosomal dominant disorders like achondroplasia and autosomal recessive disorders like thalassemia.
GENETICS - Dr. P. Saranraj, Assistant Professor, Department of Microbiology, Sacred Heart College (Autonomous), Tirupattur, Vellore District, Tamil Nadu, India
Chromosomal Basis of Inheritance
Be familiar with patterns of inheritance for autosomal and sex linked genes
Understand the concept of “Linked Genes”
Understand how traits affected by incomplete dominance and codominance differ from autosomal dominant and autosomal recessive traits
Understand how nondisjunction of chromosomes can lead to disorders.
Linked genes: are those that reside on the same chromosome and tend to be inherited together
Humans have 23 pairs of chromosomes
Autosomal genes reside on the autosomal chromosomes (pairs 1-22)
Sex-linked genes are found on the sex chromosomes
(pair 23, usually on the X)
Autosomal genes are usually represented by a pair of alleles
The phenotype of the gene reflects the dominant or recessive relationship of the alleles.
Most autosomal genetic diseases are autosomal recessive meaning the individual need to be homozygous recessive to exhibit the condition
(example: cystic fibrosis) Production of abnormmaly thick mucus. Leading to the blockage of panreatic duct, intestines and respiratory infection.
Huntington’s disease is an autosomal dominant disorder meaning that is a single Huntingtons allele is inherited, the individual will have the disease.
Some alleles do not show a dominance hierarchy
Incomplete dominance: the phenotype of a heterozygous genotype is intermediate in appearance
Codominance: each allele in the genotype for a particular gene will be expressed in the phenotype
Males and females differ in their sex chromosome combination
(females XX; males XY)
Because the X contains genes and the Y “does not”, inheritance patterns of sex-linked genes vary between the sexes
recessive traits more prevalent in males
Genetic disorders can also occur due to errors in the number of inherited chromosomes
This condition arises through a problem that occurs during meiosis
Although female mammals, including humans, inherit two X chromosomes, one X chromosome in each cell becomes almost completely inactivated during embryonic development.
Barr body
Nondisjunction:
Leads to aneuploidy:
Aneuploidy: is the condition of having less than or more than the normal diploid number of chromosomes, and is the most frequently observed type of cytogenetic abnormality.
Mendelian inheritance has its physical basis in the behavior of chromosomes during sexual life cycles.
Morgan traced a gene to a specific chromosome.
Sex-linked genes have unique patterns of inheritance.
Alterations of chromosome numbers or structure cause some genetic disorders.
Linked genes tend to be inherited together because they are located on the same chromosome.
Independent assortment of chromosomes and crossing over produce genetic variation (recombinants)
Geneticists can use recombination data to map a chromosomes genetic loci.
Chromosomal basis for sex is dependent upon the organism.
Here, Genetic disorder and chromosomal abnormality discussed briefly. *Types of the genetic disorder *briefly discussed on different genetic diseases *chromosomal anomaly i.e. structural and numerical anomaly. etc.
GENETICS - Dr. P. Saranraj, Assistant Professor, Department of Microbiology, Sacred Heart College (Autonomous), Tirupattur, Vellore District, Tamil Nadu, India
Chromosomal Basis of Inheritance
Be familiar with patterns of inheritance for autosomal and sex linked genes
Understand the concept of “Linked Genes”
Understand how traits affected by incomplete dominance and codominance differ from autosomal dominant and autosomal recessive traits
Understand how nondisjunction of chromosomes can lead to disorders.
Linked genes: are those that reside on the same chromosome and tend to be inherited together
Humans have 23 pairs of chromosomes
Autosomal genes reside on the autosomal chromosomes (pairs 1-22)
Sex-linked genes are found on the sex chromosomes
(pair 23, usually on the X)
Autosomal genes are usually represented by a pair of alleles
The phenotype of the gene reflects the dominant or recessive relationship of the alleles.
Most autosomal genetic diseases are autosomal recessive meaning the individual need to be homozygous recessive to exhibit the condition
(example: cystic fibrosis) Production of abnormmaly thick mucus. Leading to the blockage of panreatic duct, intestines and respiratory infection.
Huntington’s disease is an autosomal dominant disorder meaning that is a single Huntingtons allele is inherited, the individual will have the disease.
Some alleles do not show a dominance hierarchy
Incomplete dominance: the phenotype of a heterozygous genotype is intermediate in appearance
Codominance: each allele in the genotype for a particular gene will be expressed in the phenotype
Males and females differ in their sex chromosome combination
(females XX; males XY)
Because the X contains genes and the Y “does not”, inheritance patterns of sex-linked genes vary between the sexes
recessive traits more prevalent in males
Genetic disorders can also occur due to errors in the number of inherited chromosomes
This condition arises through a problem that occurs during meiosis
Although female mammals, including humans, inherit two X chromosomes, one X chromosome in each cell becomes almost completely inactivated during embryonic development.
Barr body
Nondisjunction:
Leads to aneuploidy:
Aneuploidy: is the condition of having less than or more than the normal diploid number of chromosomes, and is the most frequently observed type of cytogenetic abnormality.
Mendelian inheritance has its physical basis in the behavior of chromosomes during sexual life cycles.
Morgan traced a gene to a specific chromosome.
Sex-linked genes have unique patterns of inheritance.
Alterations of chromosome numbers or structure cause some genetic disorders.
Linked genes tend to be inherited together because they are located on the same chromosome.
Independent assortment of chromosomes and crossing over produce genetic variation (recombinants)
Geneticists can use recombination data to map a chromosomes genetic loci.
Chromosomal basis for sex is dependent upon the organism.
Here, Genetic disorder and chromosomal abnormality discussed briefly. *Types of the genetic disorder *briefly discussed on different genetic diseases *chromosomal anomaly i.e. structural and numerical anomaly. etc.
STAINING TECHNIQUES IN MICROBIOLOGY & CELL BIOLOGYManu Bhardwaj
Although living microorganisms can be directly examined with the light microscope, they often must be fixed and stained to increase visibility of specific morphological features, and preserve them for future study.
Capsule is an layer around the bacteria cell which gives bacteria the protection and pathogenicity. Staining such an layer is difficult with the normal stains so it is necessary to stain the background and the cell itself which makes the capsule appear colourless.
Enamel is defective in form or calcification as a result of hereditary and has an appearance ranging from essentially normal to extremely unsightly.
Also called Hereditary enamel dysplasia or Hereditary brown enamel or Hereditary brown opalescent teeth.
3 types
Hypoplastic
Hypocalcified
Hypomaturation
In radiographically, the overall shape of the teeth may or may not be normal depending upon the amount of enamel present on the tooth and the amount of occlusal & incisal wear.
Enamel appear totally absent or when present appear as thin layer, chiefly over the tips of cusp and on interproximal surface.
No treatment except for the improvement of cosmetic.X-Linked Recessive Disorders.
All sex-linked disorders are X-linked, and almost all are recessive
Usually expressed only in males
Rarely, due to random X-inactivation, a female will express disease, called manifesting heterozygotes.
Pattern Of Inheritance:
Disease usually passed on from carrier mother.
Expressed in male offspring, females are carriers.
Skipped generations are commonly seen.
In this case, Recurrence risk is half of sons are affected, half of the daughters are carriers.
Recurrence risk:
All the daughters are heterozygous carriers and all the sons are homozygous normal.
Autosomal Recessive Disorder
Largest category of Mendelian disorder
Usually does not affect the parent of the affected individual, but sibling may show the disease.
Complete penetrance is common.
Onset is frequently early in life.
Usually affect enzymatic proteins.
Pattern Of Inheritance:
Typical pattern is two heterozygous unaffected (carrier) parent.
The triat does not usually affect the parent, but siblings may show the disease
Siblings have one chance in four of being affected
Both sexes affected equally.
Autosomal Dominant Disorder:
Manifested in heterozygous states
At least one parent of index case is usually affected
Both males and females are affected.
Clinical feature can be modified by variation in penetrance and expressivity. Some individual inherit the mutant gene but are phenotpically normal. This is reffered to as “incomplete penetrance”.
In many condition the age of onset is delayed.
Inheritance Pattern:
Typical pattern is a heterozygous affected parent with a homozygous unaffected parent.
Every child has one chance in two of having the disease
Both sexes are affected equally.Autosomal Dominant.
Autosomal Recessive.
X-Linked Recessive.
X-Linked Dominant
Common genetic disorders are very common and medical professionals should understand in brief about significant disorders.
which may enable them to achieve a better role in genetic counselling.
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2. Genetics
• Human genetics- scientific study of
human variation and Heredity
• Medical genetics - study of the hereditary
nature of human disease
• Clinical genetics- Care, diagnosis and
counseling of patients with congenital
malformations or genetic diseases
5. Inherited diseases
• Due to genetic mutations- nuclear,
Mitochondrial
• Chromosomal abnormalities
• Complex traits, multifactorial disorders
6. Mutations
• Deletions- ranging from 1 bp to mega
base
• Insertions- including duplications
• Single base substitution-
• Missense mutations- replace one amino
acid with another in the gene product
• Nonsense mutations replace one amino
acid codon with a stop codon
• Splice site mutations create or destroy
signals for exon/intron splicing
• Frame shifts can be produced by
20. Down syndrome
• Common cause for • Screening – triple test
mental retardation - alpha feto
• Most are due to protien
trisomy -oestriol
21,nodisjunction
- chorionic
• Elderly mothers are gonadotopihic
more suseptible hormone
• 2-3% due to - ultra sound
translocatin of 21to14 scan
-amniocentesis
24. Fragile X syndrome
• Inherited cause of
intellectual disability
• Large protruding
ears,large testiclesle
• Due to mutation of the
fragile X mentel
retardation 1 ( FMRI)
• X linked dominent
condition with variable
expressivity
25. Autosomal dominant inheritance
• Males and females are equally affected
• Transmission between all sexes are
observed . Male to male, female to male
• Symptoms usually appear later in life
• Pleiotrophy- single gene disorder produce
multiple phenotypic effect
• Variable expressivity of gene
• Reduced or incomplete penetrance, the
26. Autosomal dominant ctd
• Codominance- when both traits are
expressed fully in heterozygous state. Ex-
AB blood group
• Intermediate inheritance
• Ex- sickle cell trait
29. Achondroplasia
•Common genetic cause
of dwarfism
•Mutation in the fibroblast
growth factor receptor
3(FGFR3)
•Cause abnormality of
cartilage formation
•Can be detected before
birth by prenatal
ultrasound
30. Autosomal dominant polycystic
kidney disease
•Inherited systemic
disease
• 1 in 400 to 1 in 1000
•Mutation in PKD1 and
PKD 2 gene
•Cyst in liver, pancreas,
cerebral aneurysm, mitral
valve prolapse.
•Imaging and molecular
studies
37. Brugada Syndrome
• More in asia
• Cause of sudden death
in young
• Can present with
atypical chest pain and
recurrent palpitation
• Mutation in sodium ion
channels
• Cause of death is VF
• Implantable
cardioverter defibrillator
38.
39. Autosomal recessive
inheritance
• Presentation - in early age, usually with
severe symptoms
• Affect either sex
• Affected people are usually born to
unaffected parents
• Parents are usually asymptomatic carriers
• Increase incidence of parental consanguinity
• After the birth of an effected child, each
subsequent child has a 25% of being
Affected
45. X linked recessive inheritance
• Affect mainly males
• Affected males are usually born to un
affected parents
• Mother is normally an asymptomatic
carrier
• There is no male to male transmission in
the pedigree
49. Duchenne muscular dystrophy
• Common inherited
muscular dystrophy
• Mutation in dystrophin
gene
• Symptoms before age
of 05
• Progressive muscle
weakness
• Pseudo hypertrophy
of calf muscles
• Cardiac involvement
50. Lyon hypothesis
• Random inactivation
of one X chromosome
in early foetal
development
51.
52. X linked dominant inheritance
• Affect either sex but more female then
males
• Female are often more mildly and more
variably then males
• No male to male transmission
58. Mitochondrial disease
• Ragged Red Fibers" -
clumps of diseased
mitochondria accumulate
in the subsarcolemmal
region of the muscle fiber
and appear as "Ragged
Red Fibers" when muscle
is stained with modified
Gömöri trichrome stain