FB2026_03 , released September 17, 2026
Aberration: Dmel\In(1)FM7a
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General Information
Symbol
In(1)FM7a
Species
D. melanogaster
Name
FlyBase ID
FBab0003929
Feature type
chromosomal_inversion
Also Known As
FM7
Computed Cytological Breakpoints (relative to progenitor)
Sequenced Breakpoints (relative to progenitor)
Member of large scale dataset(s)
Nature of Aberration
Cytological Order

1Lt-1B2 | 20F-20A | 15D-20A | 15D-11F4 | 4E1-11F2 | 4D7-1B3 | 20F-1Rt

(Bloomington Drosophila Stock Center, 2026.6.26)
Progenitor
In(1)FM6
(Merriam, 2017)
In(1)FM1
(Merriam, 2017)
Mutagen
recombination
Class of aberration (relative to wild type)
chromosomal_inversion
Class of aberration (relative to progenitor)
Cytological Breakpoints (relative to progenitor)
Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data
Genetic mapping information
Comments
Comments on Cytology
Sequence Crossreferences
DDBJ / EMBL / GenBank
DNA sequence
Protein sequence
Gene Deletion and Duplication Data
Genes Deleted / Disrupted
Complementation Data
Completely deleted / disrupted
Partially deleted / disrupted
Molecular Data
Completely deleted
Partially deleted
Genes NOT Deleted / Disrupted
Complementation Data
 
Molecular Data
 
Genes Duplicated
Complementation Data
Completely duplicated
Partially duplicated
Molecular Data
Completely duplicated
Partially duplicated
Genes NOT Duplicated
Complementation Data
 
Molecular Data
 
Affected Genes Inferred by Location (0)
    If no genes are listed here, it may be because the affected region is very large. The JBrowse insert above may show an error for the same reason, and other FlyBase tools such as CytoSearch may also fail for large regions. You can contact FlyBase for more help.
    In these cases, there will be no "Export to Hitlist" button to the left.
    Phenotypic Data
    In combination with other aberrations
    NOT in combination with other aberrations

    Male viable and fertile. Homozygous female should be viable and fertile. (FlyBase curator comment: this only refers to the original FM7a - every chromosome descended from it has additional mutations.)

    (Merriam, 1968)
    Stocks (12)
    Notes on Origin
    Discoverer
     

    FM7a was generated by John Merriam by recombining the Chromosome X balancer, FM6 (generated by inducing an inversion of 15D-E;20F by X-rays on FM4), with an X chromosome carrying In(1)sc8 (an inversion of 1B2-3;20F) and In(1)dl-49 (an inversion of 4D7-E1;11F2-4) (FBrf0237833).

    (Parks and Cook, 2026.8.6)
    Balancer / Genotype Variants of the Aberration
     
    FM7a
    (Miller et al., 2020, Miller et al., 2019, Merriam, 2017, Miller et al., 2016, Rice et al., 2015, Lattao et al., 2011, Subramanian and Bickel, 2009, FlyBase Curators, 2006-, Lindsley and Zimm, 1992, Merriam, 1968)
    FM7a-Bar+
    (FlyBase Curators, 2006-)
    FM7a-nod4
    (FlyBase Curators, 2006-)
    FM7a-P{sChFP}1
    (Parkhurst, 2011.4.14)
    FM7a-P{Tub-AcrIIA4.RFP+}17
    (Han, 2025-)
    FM7a-P{Tub-AcrIIA4.RFP+}46
    (Han, 2025-)
    FM7b
    (Merriam, 2017, FlyBase Curators, 2006-)
    FM7c
    (Miller et al., 2020, Merriam, 2017, Miller et al., 2016, Rice et al., 2015, FlyBase Curators, 2006-)
    FM7c-2xTb-RFP
    (Pina and Pignoni, 2012)
    FM7c-10
    (FlyBase Curators, 2006-)
    FM7c-34
    (FlyBase Curators, 2006-)
    FM7c-actLacZ
    (FlyBase Curators, 2006-)
    FM7c-Bar+
    (FlyBase Curators, 2006-)
    FM7c-ctS
    (FlyBase Curators, 2006-)
    FM7c-cvWJB,fPDB
    (Benner and Oliver, 2018, Benner and Oliver, 2018.11.9)
    FM7c-FTG
    (FlyBase Curators, 2006-)
    FM7c-P{Dfd-GMR-nvYFP}1,sn+
    (Miller and Hawley, 2014.4.15, Beitel, 2007.4.20)
    FM7c-sn+
    (FlyBase Curators, 2006-)
    FM7c-vHa
    (FlyBase Curators, 2006-)
    FM7c-vKa
    (FlyBase Curators, 2006-)
    FM7c-w+
    (FlyBase Curators, 2006-)
    FM7d
    (FlyBase Curators, 2006-)
    FM7e
    (FlyBase Curators, 2006-)
    FM7e-P{ftz-lac}
    (FlyBase Curators, 2006-)
    FM7f
    (FlyBase Curators, 2006-)
    FM7f-P{ftz-lac}
    (FlyBase Curators, 2006-)
    FM7g
    (FlyBase Curators, 2006-)
    FM7g-ctns
    (FlyBase Curators, 2006-)
    FM7g-Nnd-0
    (FlyBase Curators, 2006-)
    FM7h
    (FlyBase Curators, 2006-)
    FM7h-FS2
    (Sun et al., 2012)
    FM7h-FS4
    (Sun et al., 2012)
    FM7h-FS5
    (Sun et al., 2012)
    FM7h-FS5-GMR-GFP
    (Sun et al., 2012)
    FM7h-FS5-y
    (Sun et al., 2012)
    FM7h-NPlacr
    (FlyBase Curators, 2006-)
    FM7h-P{UAS.RMCE.w+}1B
    (Matinyan et al., 2021)
    FM7h-P{Ubi-GFP.U}1
    (Bilder, 2017.12.11)
    FM7i
    (FlyBase Curators, 2006-)
    FM7i-pAct-GFP
    (FlyBase Curators, 2006-)
    FM7j
    (FlyBase Curators, 2006-)
    FM7j-Bar1
    (FlyBase Curators, 2006-, Ryder et al., 2004, Roote, 2001.12.11)
    FM7k
    (Cook, 2026.6.23, FlyBase Curators, 2006-)
    FM7-l(1)TW241
    (FlyBase Curators, 2006-)
    FM7-TbB
    (Lattao et al., 2011)
    FM7w
    (FlyBase Curators, 2006-, Sekelsky et al., 1999)
    Separable Components
     
    Other Comments
     

    FM7a variants have been made carrying different markers. The following is a list of named variants and their core markers (FBrf0237833, FBrf0098438, FBrf0102818 and references therein): FM7b : y[31d] sc[8] w[a] lz[s] Bar[1]. FM7c : y[31d] sc[8] w[a] sn[X2] v[Of] g[4] Bar[1]. FM7d : y[31d] sc[8] Bar[1]. FM7e : y[31d] sc[8] oc[1] ptg[1] Bar[1] (also known as FM7d, oc[1] ptg[1]). FM7f : y[93j] sc[8] oc[1] ptg[1] Bar[1] (also known as FM7i w[+]). FM7g : y[31d] sc[8] w[a] oc[1] ptg[1] v[Of] Bar[1] (also known as FM7d, w[a] oc[1] ptg[1] v[Of]). FM7h : y[31d] sc[8] w[1] oc[1] ptg[1] Bar[1]. FM7i : y[93j] sc[8] w[1] oc[1] ptg[1] Bar[1]. FM7j : y[93j] sc[8] w[1]. FM7k : y[31d] sc[8] sn[X2] Bar[1].

    (Parks and Cook, 2026.8.6)

    Heterozygosity for In(1)FM7a results in a complete, or near complete, suppression of exchange along the length of the X chromosome.

    (Gong et al., 2005)

    An excellent suppressor of recombination with normal-sequence X chromosomes. Commonly used in balancing, even in female fertile versions.

    Synonyms and Secondary IDs (6)
    References (77)