1-27547449-A-T

Position:

• chr1-27547449-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001371928.1(AHDC1):​c.4667T>A​(p.Leu1556Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000131 in 152,230 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: 𝑓 0.000013 (0 hom., cov: 33)
• Consequence: AHDC1 NM_001371928.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 5.24

Genes affected

AHDC1 (HGNC:25230): (AT-hook DNA binding motif containing 1) This gene encodes a protein containing two AT-hooks, which likely function in DNA binding. Mutations in this gene were found in individuals with Xia-Gibbs syndrome. [provided by RefSeq, Jun 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29076055).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AHDC1	NM_001371928.1	c.4667T>A	p.Leu1556Gln	missense_variant	8/9	ENST00000673934.1	NP_001358857.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AHDC1	ENST00000673934.1	c.4667T>A	p.Leu1556Gln	missense_variant	8/9		NM_001371928.1	ENSP00000501218	P1

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152230 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000482

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 30

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152230 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74376

Gnomad4 AFR AF: 0.0000482

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000189

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.00 AC: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jun 20, 2023	This variant is not present in population databases (gnomAD no frequency). 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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 2468957). This variant has not been reported in the literature in individuals affected with AHDC1-related conditions. This sequence change replaces leucine, which is neutral and non-polar, with glutamine, which is neutral and polar, at codon 1556 of the AHDC1 protein (p.Leu1556Gln). -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 25, 2023	Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 20, 2023

The c.4667T>A (p.L1556Q) alteration is located in exon 6 (coding exon 1) of the AHDC1 gene. This alteration results from a T to A substitution at nucleotide position 4667, causing the leucine (L) at amino acid position 1556 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Uncertain	0.067	T
BayesDel_noAF	Benign	-0.14
CADD	Pathogenic	26
DANN	Uncertain	0.98
DEOGEN2	Benign	0.22	T;T;T;T;T
Eigen	Uncertain	0.25
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.78	.;.;T;.;.
M_CAP	Benign	0.055	D
MetaRNN	Benign	0.29	T;T;T;T;T
MetaSVM	Benign	-0.95	T
MutationAssessor	Benign	0.34	N;N;N;N;N
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-1.6	N;.;N;.;.
REVEL	Benign	0.23
Sift	Uncertain	0.0020	D;.;D;.;.
Sift4G	Uncertain	0.049	D;.;D;.;.
Polyphen		0.83	P;P;P;P;P
Vest4		0.58
MVP		0.33
MPC		1.5
ClinPred		0.73	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.39
gMVP		0.45

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: rs368785856; hg19: chr1-27873960;