12-109102808-G-GTT

Variant names:

• chr12-109102808-G-GTT
• rs3219235
• NM_080911.3:c.534-26_534-25dupTT

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_080911.3(UNG):​c.534-26_534-25dupTT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000215 in 1,397,472 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. There are indicators that this mutation may affect the branch point..

• Frequency:
  • Genomes: not found (cov: 27)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: UNG NM_080911.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.40
• Publications: 0 publications found

Genes affected

UNG (HGNC:12572): (uracil DNA glycosylase) This gene encodes one of several uracil-DNA glycosylases. One important function of uracil-DNA glycosylases is to prevent mutagenesis by eliminating uracil from DNA molecules by cleaving the N-glycosylic bond and initiating the base-excision repair (BER) pathway. Uracil bases occur from cytosine deamination or misincorporation of dUMP residues. Alternative promoter usage and splicing of this gene leads to two different isoforms: the mitochondrial UNG1 and the nuclear UNG2. The UNG2 term was used as a previous symbol for the CCNO gene (GeneID 10309), which has been confused with this gene, in the literature and some databases. [provided by RefSeq, Nov 2010]

UNG Gene-Disease associations (from GenCC):

• hyper-IgM syndrome type 5

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UNG	NM_080911.3	c.534-26_534-25dupTT		intron_variant	Intron 4 of 6	ENST00000242576.7	NP_550433.1
UNG	NM_003362.4	c.507-26_507-25dupTT		intron_variant	Intron 3 of 5		NP_003353.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UNG	ENST00000242576.7	c.534-31_534-30insTT		intron_variant	Intron 4 of 6	1	NM_080911.3	ENSP00000242576.3

Frequencies

GnomAD3 genomes Cov.: 27

GnomAD4 exome AF: 0.00000215 AC: 3 AN: 1397472 Hom.: 0 Cov.: 26 AF XY: 0.00000286 AC XY: 2 AN XY: 699526

African (AFR) AF: 0.00 AC: 0 AN: 32172

American (AMR) AF: 0.00 AC: 0 AN: 44626

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25680

East Asian (EAS) AF: 0.00 AC: 0 AN: 39396

South Asian (SAS) AF: 0.0000118 AC: 1 AN: 84878

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52812

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5652

European-Non Finnish (NFE) AF: 0.00000190 AC: 2 AN: 1054064

Other (OTH) AF: 0.00 AC: 0 AN: 58192

GnomAD4 genome Cov.: 27

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		-1.4
BranchPoint Hunter		2.0

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs3219235; hg19: chr12-109540613;