13-27920320-GC-GCC

Variant names:

• chr13-27920320-G-GC
• rs193929377
• NM_000209.4:c.188dupC

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_000209.4(PDX1):​c.188dupC​(p.Asp64GlyfsTer161) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: PDX1 NM_000209.4 frameshift
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.540
• Publications: 0 publications found

Genes affected

PDX1 (HGNC:6107): (pancreatic and duodenal homeobox 1) The protein encoded by this gene is a transcriptional activator of several genes, including insulin, somatostatin, glucokinase, islet amyloid polypeptide, and glucose transporter type 2. The encoded nuclear protein is involved in the early development of the pancreas and plays a major role in glucose-dependent regulation of insulin gene expression. Defects in this gene are a cause of pancreatic agenesis, which can lead to early-onset insulin-dependent diabetes mellitus (IDDM), as well as maturity onset diabetes of the young type 4 (MODY4). [provided by RefSeq, Aug 2017]

PDX1 Gene-Disease associations (from GenCC):

• maturity-onset diabetes of the young type 4

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• pancreatic agenesis 1

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
• permanent neonatal diabetes mellitus

  Inheritance: AD, AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp
• monogenic diabetes

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen
• maturity-onset diabetes of the young

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• pancreatic agenesis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000209.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PDX1	NM_000209.4	MANE Select	c.188dupC	p.Asp64GlyfsTer161	frameshift	Exon 1 of 2	NP_000200.1	P52945

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PDX1	ENST00000381033.5	TSL:1 MANE Select	c.188dupC	p.Asp64GlyfsTer161	frameshift	Exon 1 of 2	ENSP00000370421.4	P52945

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1389710 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 685022

African (AFR) AF: 0.00 AC: 0 AN: 31362

American (AMR) AF: 0.00 AC: 0 AN: 35432

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24756

East Asian (EAS) AF: 0.00 AC: 0 AN: 35606

South Asian (SAS) AF: 0.00 AC: 0 AN: 78490

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46976

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4784

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1074720

Other (OTH) AF: 0.00 AC: 0 AN: 57584

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.54

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs193929377; hg19: chr13-28494457;