FGSC #1999

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Reporting Genes: nuc-1 ad-3A

Species: crassa

Allele: T28-M1 no#

Depositor: TI

Linkage Group: IR IR

Mating Type: A

Species Number: 10

ref1: https://www.genetics.org/content/genetics/63/1/75.full.pdf

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
nuc-1	IR. Right of T(AR173) and his-2 (<1%). Left of lys-4(1%). (514) nuc-1mutants (other than nuc-1c) are unable to use RNA or DNA as a phosphorus source (450, 514). Defective in production of repressible alkaline and acid phosphatases (671, 1077). Several nucleases are absent or reduced (449). nuc-1 is epistatic to both pconc and pregc (671) and to pgovc (665). Scored on low-phosphate medium by a staining reaction with alpha-naphthyl phosphate plus diazo blue B (397, 1077), by failure to grow on minimal medium altered so that 0.1 g of RNA or DNA per liter is substituted for the inorganic phosphate source (514, 538), or by failure to grow on low-phosphate medium at a pH above 7 (R.L. Metzenberg, personal communication). nuc-1c is constitutive for alkaline phosphatase synthesis and maps very close to nuc-1. nuc-1c acts only if it is cis to normal nuc-1. In duplications, nuc-1c is dominant to nuc-1+, which is dominant to nuc-1. nuc-1c is epistatic to nuc-2(670). nuc-1c is scored on high-phosphate medium by a staining reaction with alpha-naphthyl phosphate plus diazo blue B (397, 1077) or by suppression of the nuc-2 phenotype on low-phosphate medium at high pH (670). Used to study phosphate transport (624). For regulation model see references 665 and 670.	IR	B
ad-3A	IR. Between his-3 (1 to 2%) and ad-3B (0.1 to 0.7%) (271). Right of ure-4 (78). (482) Requires adenine or hypoxanthine (682). Blocked in interconversion of CAIR plus aspartate to SAICAR (348) (Fig. 8). Produces purple pigment, permitting direct visual selection (276, 682); see the ad-3B entry. Reduced interallelic fertility (407). No interallelic complementation (267; F.J. de Serres, personal communication). ad-3A and ad-3B are two genetically and functionally distinct loci separated by a short but functionally complex region of unknown but essential function (271, 407). They have been used intensively for quantitative genetic and molecular studies of mutation (for a review, see reference 35). Either forward mutation (e.g., reference 277) or reverse mutation (e.g., reference 772) can be measured precisely; the former is detected visually by purple pigment. Purple pigment has also been used to assess the effect of histidine and tryptophan on purine nucleotide synthesis (786). Alleles N23 and N24 have been used as mutagen testers. N23 reverts with agents that cause base pair substitutions; N24 reverts with agents that cause frameshifts (772). SK(ad-3A) is at or near ad-3A and may be a cryptic ad-3A allele. Does not require adenine. In SK(ad-3A)x ad-3Acrosses, the ad-3A progeny die; possibly SK(ad-3A) mutants fail to make enough adenine to support their growth (251). Translocations Y155M64 ad-3A (272; PB) and Y112M15 ad-3A(413) each have one breakpoint that is inseparable from ad-3A. Called complementation group A (264). "A" in the locus symbol does not refer to mating type.	IR	B