chr13-27920166-G-C

Variant names:

• chr13-27920166-G-C
• rs936474667
• NM_000209.4:c.28G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_000209.4(PDX1):​c.28G>C​(p.Ala10Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000716 in 1,397,606 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A10T) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: PDX1 NM_000209.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.437
• Publications: 1 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, Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• permanent neonatal diabetes mellitus

  Inheritance: AR, AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
• 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: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 7 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: -0.26592 (below the threshold of 3.09). Trascript score misZ: -1.1553 (below the threshold of 3.09). GenCC associations: The gene is linked to pancreatic agenesis 1, monogenic diabetes, pancreatic agenesis, maturity-onset diabetes of the young, permanent neonatal diabetes mellitus, maturity-onset diabetes of the young type 4.
• BP4: Computational evidence support a benign effect (MetaRNN=0.37129542).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PDX1	NM_000209.4	c.28G>C	p.Ala10Pro	missense_variant	Exon 1 of 2	ENST00000381033.5	NP_000200.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PDX1	ENST00000381033.5	c.28G>C	p.Ala10Pro	missense_variant	Exon 1 of 2	1	NM_000209.4	ENSP00000370421.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00 AC: 0 AN: 146938 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 7.16e-7 AC: 1 AN: 1397606 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 689346

African (AFR) AF: 0.00 AC: 0 AN: 31578

American (AMR) AF: 0.0000280 AC: 1 AN: 35714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25146

East Asian (EAS) AF: 0.00 AC: 0 AN: 35736

South Asian (SAS) AF: 0.00 AC: 0 AN: 79232

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47904

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5658

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1078688

Other (OTH) AF: 0.00 AC: 0 AN: 57950

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.0
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.29	T
Eigen	Benign	-0.024
Eigen_PC	Benign	-0.016
FATHMM_MKL	Benign	0.64	D
LIST_S2	Benign	0.66	T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-0.38	T
MutationAssessor	Benign	1.0	L
PhyloP100		0.44
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	0.96	N
REVEL	Uncertain	0.52
Sift	Benign	0.12	T
Sift4G	Benign	0.34	T
Polyphen		0.99	D
Vest4		0.31
MutPred		0.54		Gain of catalytic residue at Q12 (P = 0);
MVP		0.94
MPC		1.2
ClinPred		0.59	D
GERP RS		3.5
PromoterAI		-0.095	Neutral
Varity_R		0.19
gMVP		0.57
Mutation Taster		=86/14	polymorphism

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: rs936474667; hg19: chr13-28494303;