10-27100445-G-C

Variant names:

• chr10-27100445-G-C
• rs1554800065
• NM_014915.3:c.-119C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 3P and 1B. PM2 PP5 BP4

The NM_014915.3(ANKRD26):​c.-119C>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 34)
• Consequence: ANKRD26 NM_014915.3 5_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:2
• Conservation: PhyloP100: 0.553
• Publications: 1 publications found

Genes affected

ANKRD26 (HGNC:29186): (ankyrin repeat domain containing 26) This gene encodes a protein containing N-terminal ankyrin repeats which function in protein-protein interactions. Mutations in this gene are associated with autosomal dominant thrombocytopenia-2. Pseudogenes of this gene are found on chromosome 7, 10, 13 and 16. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2011]

ANKRD26 Gene-Disease associations (from GenCC):

• thrombocytopenia 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• acute myeloid leukemia

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• autosomal thrombocytopenia with normal platelets

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary thrombocytopenia and hematologic cancer predisposition syndrome

  Inheritance: AD 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
• PP5: Variant 10-27100445-G-C is Pathogenic according to our data. Variant chr10-27100445-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 434210.
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.38). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ANKRD26	NM_014915.3	c.-119C>G		5_prime_UTR_variant	Exon 1 of 34	ENST00000376087.5	NP_055730.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ANKRD26	ENST00000376087.5	c.-119C>G		5_prime_UTR_variant	Exon 1 of 34	5	NM_014915.3	ENSP00000365255.4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 20

GnomAD4 genome Cov.: 34

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:1 Uncertain:1

Dec 08, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant occurs in a non-coding region of the ANKRD26 gene. It does not change the encoded amino acid sequence of the ANKRD26 protein. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with ANKRD26-related conditions (PMID: 28104920, 28669401, 32581362). ClinVar contains an entry for this variant (Variation ID: 434210). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Jan 24, 2025

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Located in the 5' untranslated region where the vast majority of pathogenic variants occur (PMID: 21211618, 35587581); No data available from control populations to assess the frequency of this variant; This variant is associated with the following publications: (PMID: 28669401, 28104920, Wahlster2024[Abstract], 32351539, 35537115, 31309983, 32581362) -

Thrombocytopenia 2 Pathogenic:1

Nov 02, 2015

Genetic Services Laboratory, University of Chicago

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Thrombocytopenia Pathogenic:1

-

NIHR Bioresource Rare Diseases, University of Cambridge

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

not specified Uncertain:1

Jul 22, 2024

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ANKRD26 c.-119C>G is located in the untranslated mRNA region upstream of the initiation codon. The variant was absent in 31370 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.-119C>G has been reported in the literature in an individual who underwent Myelodysplastic syndrome (MDS) and acute leukemia (AL) panel testing (example: Guidugli_2017) and authors classified the variant as pathogenic or likely pathogenic. However, this report does not provide unequivocal conclusions about association of the variant with Thrombocytopenia 2. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 28669401, 28104920, 32581362). ClinVar contains an entry for this variant (Variation ID: 434210). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.38
CADD	Benign	14
DANN	Benign	0.78
PhyloP100		0.55
PromoterAI		-0.24	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Mutation Taster		=38/262	disease causing (ClinVar)

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: rs1554800065; hg19: chr10-27389374;