chr5-55220469-A-T

Position:

• chr5-55220469-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001190787.3(MCIDAS):​c.1055T>A​(p.Ile352Asn) variant causes a missense change. 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I352L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MCIDAS NM_001190787.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.68

Genes affected

MCIDAS (HGNC:40050): (multiciliate differentiation and DNA synthesis associated cell cycle protein) This gene encodes a member of the geminin family of proteins. The encoded nuclear protein is required for the generation of multiciliated cells in respiratory epithelium. Mutations in this gene cause a rare mucociliary clearance disorder associated with recurring respiratory infections in human patients, known as reduced generation of multiple motile cilia (RGMC). [provided by RefSeq, Sep 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.778

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MCIDAS	NM_001190787.3	c.1055T>A	p.Ile352Asn	missense_variant	7/7	ENST00000513312.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MCIDAS	ENST00000513312.3	c.1055T>A	p.Ile352Asn	missense_variant	7/7	1	NM_001190787.3	P1
MCIDAS	ENST00000513468.5	c.*519T>A		3_prime_UTR_variant, NMD_transcript_variant	7/7	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 21, 2023

The c.1055T>A (p.I352N) alteration is located in exon 7 (coding exon 7) of the MCIDAS gene. This alteration results from a T to A substitution at nucleotide position 1055, causing the isoleucine (I) at amino acid position 352 to be replaced by an asparagine (N). 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	Pathogenic	0.87
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.010
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Benign	0.098	T
Eigen	Uncertain	0.64
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.83	T
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.78	D
MetaSVM	Benign	-0.50	T
MutationAssessor	Uncertain	2.1	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.77	T
PROVEAN	Benign	-2.3	N
REVEL	Benign	0.24
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.82
MutPred		0.32		Loss of sheet (P = 0.0037);
MVP		0.49
ClinPred		0.97	D
GERP RS		4.8
Varity_R		0.63
gMVP		0.88

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: rs572572363; hg19: chr5-54516297;