2-219055182-C-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_002181.4(IHH):c.*25G>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00231 in 1,552,398 control chromosomes in the GnomAD database, including 141 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0030 (23 hom., cov: 33)
  • Exomes 𝑓: 0.0022 (118 hom.)
• Consequence: IHH NM_002181.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.0320

Genes affected

IHH (HGNC:5956): (Indian hedgehog signaling molecule) This gene encodes a member of the hedgehog family of proteins. The encoded preproprotein is proteolytically processed to generate multiple protein products, including an N-terminal fragment that is involved in signaling. Hedgehog family proteins are essential secreted signaling molecules that regulate a variety of developmental processes including growth, patterning and morphogenesis. The protein encoded by this gene specifically plays a role in bone growth and differentiation. Mutations in this gene are the cause of brachydactyly type A1, which is characterized by shortening or malformation of the fingers and toes. Mutations in this gene are also the cause of acrocapitofemoral dysplasia. [provided by RefSeq, Nov 2015]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.72).
• BP6: Variant 2-219055182-C-A is Benign according to our data. Variant chr2-219055182-C-A is described in ClinVar as [Benign]. Clinvar id is 334431.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.079 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IHH	NM_002181.4	c.*25G>T		3_prime_UTR_variant	3/3	ENST00000295731.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IHH	ENST00000295731.7	c.*25G>T		3_prime_UTR_variant	3/3	1	NM_002181.4	P1

Frequencies

GnomAD3 genomes AF: 0.00304 AC: 463 AN: 152258 Hom.: 23 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000458

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.0856

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00382

GnomAD3 exomes AF: 0.00676 AC: 1030 AN: 152322 Hom.: 36 AF XY: 0.00672 AC XY: 549 AN XY: 81666

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000805

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0908

Gnomad SAS exome AF: 0.000568

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000866

Gnomad OTH exome AF: 0.00208

GnomAD4 exome AF: 0.00223 AC: 3129 AN: 1400022 Hom.: 118 Cov.: 30 AF XY: 0.00220 AC XY: 1523 AN XY: 690764

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000139

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0805

Gnomad4 SAS exome AF: 0.000491

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000315

Gnomad4 OTH exome AF: 0.00291

GnomAD4 genome AF: 0.00303 AC: 462 AN: 152376 Hom.: 23 Cov.: 33 AF XY: 0.00353 AC XY: 263 AN XY: 74520

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000457

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.0856

Gnomad4 SAS AF: 0.000414

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00378

Alfa AF: 0.000435 Hom.: 0

Bravo AF: 0.00379

Asia WGS AF: 0.0160 AC: 55 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Brachydactyly type A1 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Nov 12, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.72
Cadd	Benign	4.2
Dann	Benign	0.80

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

Publications

LitVar

Other links and lift over

dbSNP: rs76709099; hg19: chr2-219919904;