rs193922578

Variant names:

• chr12-120978893-GC-G
• rs193922578
• NM_000545.8:c.130delC

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PP1_Strong PVS1 PM2_Supporting PP4

This summary comes from the ClinGen Evidence Repository: The c.130delC variant in the HNF1 homeobox A gene, HNF1A, causes a frameshift in the protein at codon 44 (NM_000545.8), adding 111 novel amino acids before encountering a stop codon (p.(Leu44TrpfsTer111)). This variant, located in biologically-relevant exon 1 of 10, is predicted to lead to nonsense mediated decay in a gene in which loss-of-function is an established disease mechanism (PVS1; PMID:23348805) and is absent from gnomAD v2.1.1 (PM2_Supporting). Additionally, this variant was identified in an individual with a clinical history highly specific for HNF1A-MODY (MODY probability calculator result >50%, negative genetic testing for HNF4A) (PP4; PMID:15305805). This variant segregated with diabetes, with at least five informative meioses in two families with MODY (PP1_Strong; PMIDs: 15305805 and 12453976). This variant was Identified in two unrelated individuals with non-autoimmune and non-absolute/near-absolute insulin-deficient diabetes; however, PS4_Moderate cannot be applied because this number is below the ClinGen MDEP threshold (PMIDs: 15305805 and 12453976). In summary, c.130delC meets the criteria to be classified as pathogenic for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 1.1, approved 9/30/21): PVS1, PM2_Supporting, PP1_Strong, PP4. LINK:https://erepo.genome.network/evrepo/ui/classification/CA214261/MONDO:0015967/017

• Frequency: Genomes: not found (cov: 32)
• Consequence: HNF1A NM_000545.8 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:4
• Conservation: PhyloP100: -0.174
• Publications: 2 publications found

Genes affected

HNF1A (HGNC:11621): (HNF1 homeobox A) The protein encoded by this gene is a transcription factor required for the expression of several liver-specific genes. The encoded protein functions as a homodimer and binds to the inverted palindrome 5'-GTTAATNATTAAC-3'. Defects in this gene are a cause of maturity onset diabetes of the young type 3 (MODY3) and also can result in the appearance of hepatic adenomas. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Apr 2015]

HNF1A-AS1 (HGNC:26785): (HNF1A antisense RNA 1)

ACMG classification

Our verdict: Pathogenic. The variant received 14 ACMG points.

• PVS1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HNF1A	NM_000545.8	c.130delC	p.Leu44TrpfsTer111	frameshift_variant	Exon 1 of 10	ENST00000257555.11	NP_000536.6
HNF1A	NM_001306179.2	c.130delC	p.Leu44TrpfsTer111	frameshift_variant	Exon 1 of 10		NP_001293108.2
HNF1A	NM_001406915.1	c.130delC	p.Leu44TrpfsTer111	frameshift_variant	Exon 1 of 9		NP_001393844.1
HNF1A	XM_024449168.2	c.130delC	p.Leu44TrpfsTer111	frameshift_variant	Exon 1 of 9		XP_024304936.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HNF1A	ENST00000257555.11	c.130delC	p.Leu44TrpfsTer111	frameshift_variant	Exon 1 of 10	1	NM_000545.8	ENSP00000257555.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: reviewed by expert panel

Submissions by phenotype

Maturity onset diabetes mellitus in young Pathogenic:2

Feb 23, 2019

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.130delC pathogenic mutation, located in coding exon 1 of the HNF1A gene, results from a deletion of one nucleotide at nucleotide position 130, causing a translational frameshift with a predicted alternate stop codon (p.L44Wfs*111). This mutation was identified in multiple individuals from two maturity-onset diabetes of the young families (Klupa T et al. Diabetes Care, 2002 Dec;25:2292-301; McKinney JL et al. Clin Invest Med, 2004 Jun;27:135-41). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

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Clinical Genomics, Uppaluri K&H Personalized Medicine Clinic

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

Mutations in HNF1A gene can predispose to MODY3. It is associated with both micro and macrovascular complications of diabetes, especially cardiovascular complications. Associated with glucosuria. May respond well to sulfonylureas. However, more evidence is required to confer the association of this particular variant rs193922578 with MODY3. -

Monogenic diabetes Pathogenic:1

Apr 02, 2022

ClinGen Monogenic Diabetes Variant Curation Expert Panel

Significance: Pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

The c.130delC variant in the HNF1 homeobox A gene, HNF1A, causes a frameshift in the protein at codon 44 (NM_000545.8), adding 111 novel amino acids before encountering a stop codon (p.(Leu44TrpfsTer111)). This variant, located in biologically-relevant exon 1 of 10, is predicted to lead to nonsense mediated decay in a gene in which loss-of-function is an established disease mechanism (PVS1; PMID: 23348805) and is absent from gnomAD v2.1.1 (PM2_Supporting). Additionally, this variant was identified in an individual with a clinical history highly specific for HNF1A-MODY (MODY probability calculator result >50%, negative genetic testing for HNF4A) (PP4; PMID: 15305805). This variant segregated with diabetes, with at least five informative meioses in two families with MODY (PP1_Strong; PMIDs: 15305805 and 12453976). This variant was Identified in two unrelated individuals with non-autoimmune and non-absolute/near-absolute insulin-deficient diabetes; however, PS4_Moderate cannot be applied because this number is below the ClinGen MDEP threshold (PMIDs: 15305805 and 12453976). In summary, c.130delC meets the criteria to be classified as pathogenic for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 1.1, approved 9/30/21): PVS1, PM2_Supporting, PP1_Strong, PP4. -

Maturity-onset diabetes of the young type 3 Pathogenic:1

Aug 18, 2011

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing;curation

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.17
Mutation Taster		=3/197	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs193922578; hg19: chr12-121416696;