chr11-2159862-T-C

Position:

• chr11-2159862-T-C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Moderate

The NM_000207.3(INS):​c.323A>G​(p.Tyr108Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely risk allele (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y108D) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 34)
• Consequence: INS NM_000207.3 missense
• Clinical Significance: Likely risk allele criteria provided, single submitter P:1 O:2
• Conservation: PhyloP100: 2.74

Genes affected

INS (HGNC:6081): (insulin) This gene encodes insulin, a peptide hormone that plays a vital role in the regulation of carbohydrate and lipid metabolism. After removal of the precursor signal peptide, proinsulin is post-translationally cleaved into three peptides: the B chain and A chain peptides, which are covalently linked via two disulfide bonds to form insulin, and C-peptide. Binding of insulin to the insulin receptor (INSR) stimulates glucose uptake. A multitude of mutant alleles with phenotypic effects have been identified, including insulin-dependent diabetes mellitus, permanent neonatal diabetes diabetes mellitus, maturity-onset diabetes of the young type 10 and hyperproinsulinemia. There is a read-through gene, INS-IGF2, which overlaps with this gene at the 5' region and with the IGF2 gene at the 3' region. [provided by RefSeq, May 2020]

INS-IGF2 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_000207.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-2159863-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1526010.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.988
• PP5: Variant 11-2159862-T-C is Pathogenic according to our data. Variant chr11-2159862-T-C is described in ClinVar as [Likely_risk_allele]. Clinvar id is 21120.Status of the report is criteria_provided_single_submitter, 1 stars. We mark this variant Likely_pathogenic, oryginal submissions are: {not_provided=2, Likely_risk_allele=1}. Variant chr11-2159862-T-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
INS	NM_000207.3	c.323A>G	p.Tyr108Cys	missense_variant	3/3	ENST00000381330.5
INS-IGF2	NR_003512.4	n.246+923A>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
INS	ENST00000381330.5	c.323A>G	p.Tyr108Cys	missense_variant	3/3	1	NM_000207.3	P1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 34

ClinVar

Significance: Likely risk allele

Submissions summary: Pathogenic:1 Other:2

Revision: criteria provided, single submitter

Submissions by phenotype

Permanent neonatal diabetes mellitus Other:2

not provided, no classification provided	literature only	GeneReviews	-	- -
not provided, no classification provided	literature only	UniProtKB/Swiss-Prot	-	- -

Diabetes mellitus, permanent neonatal 4 Pathogenic:1

Likely risk allele, criteria provided, single submitter

research

Clinical Genomics, Uppaluri K&H Personalized Medicine Clinic

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Potent mutations in the INS gene can cause early-onset diabetes mellitus which is insulin dependent. It may have poor response to sulfonylureas, as mutations in this gene can cause beta cell destruction. rs80356672 variant can affect insulin biosynthesis and could be a contributing factor to the increased risk of diabetes. However, the role of this particular variant in diabetes patients is yet to be ascertained -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.53
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D;D;D;.
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.55
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.95	.;.;D;D
M_CAP	Pathogenic	0.94	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.0	H;H;H;.
MutationTaster	Benign	1.0	A;A;A;A;A;A
PROVEAN	Pathogenic	-6.9	D;D;D;D
REVEL	Pathogenic	0.96
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;D;D;D
Vest4		0.92
MutPred		0.90		Gain of loop (P = 0.1069);Gain of loop (P = 0.1069);Gain of loop (P = 0.1069);.;
MVP		0.96
MPC		1.3
ClinPred		1.0	D
GERP RS		3.6
Varity_R		0.99
gMVP		0.99

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

Publications

LitVar

Other links and lift over

dbSNP: rs80356672; hg19: chr11-2181092;