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BioCellGen-public
sscocaller
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e015b5e5
Commit
e015b5e5
authored
3 years ago
by
Ruqian Lyu
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chang HMM to ong
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Pipeline
#6605
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3 years ago
Stage: buildStatic
Stage: testStatic
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@@ -11,33 +11,7 @@ sequence for the list of SNP markers.

## Hidden Markov Model configuration
-
Observations. The allele specific counts across the informative SNP markers for
each chromosome in each sperm cell.
-
States. Sperm cells have haploid genomes. There are two possible hidden states (haplotypes)
corresponding to a REF or ALT segment in the haploid genome. At each SNP site $i$,
there are two hidden states: $s_{i}= 0$ corresponds to ALT segment while $s_i=1$
corresponds to REF segment.
-
Emission probabilities. Two binomial distributions were used for modelling the
emission probabilities for sperm cells at each SNP marker. For each site $s_i$
$$ c = c_r + c_a ~,$$
$$c_a |_{s = 0}
\s
im Bin(c,
\t
heta_{ALT} ) ~,$$
$$c_a |_{s = 1}
\s
im Bin(c,
\t
heta_{REF} ) ~.$$
-
Transition Probabilities}. A distance-dependent transition probability
[
[1]
](
#1
)
was applied, which corresponded to an average of
`--cmPmb`
cM (centiMorgan) per 1Mb
(1 million base pairs):
$$p_{ij} = 1-e^{(-d_{ij}
\m
athbf{x}0.5
\m
athbf{x}10^{-8})} ~,$$
where $p_{ij}$ is the transition probability of transitioning to a different
state at SNP $j$ from SNP $i$, and $d_{ij}$ denotes the physical base-pair
distances between SNP $i$ and SNP $j$.
-
Initial probabilities. The initial probabilities for the two hidden states
were set to be both 0.5 since they were equally likely to happen.

## Inputs
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